by | Sep 27, 2025
SikaBiresin
L337
1 /
2
PRODUCT DATA SHEET
SikaBiresin L337
Version 01.01 (08 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin L337 (Formerly EL-337)
Filled Epoxy Laminating System for High Temperature Applications
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin L337
is a two component, filled,
non-staining epoxy laminating system that
provides room temperature hardening (B
Stage) and is designed for high temperature
laminating and tooling applications.
SikaBiresin L337
has excellent handling
properties and fabric wet-out to produce a
void free tool with high dimensional stability.
Tools made with SikaBiresin L337 can be
used at continuous temperatures of 230 F
(110 C) and up to a 250 F (121 C) intermittent
use maximum. While SikaBiresin L337
will
gel at room temperature, it must be post-
cured to achieve ultimate strength.
PRODUCT BENEFITS
– For applications up to 250 F (121 C)
– High mechanical properties
– Excellent cloth wet-out
– Excellent dimensional stability
AREAS OF APPLICATION
Typical applications include vacuum form
molds, prototype injection molds, high
temperature bonding fixtures, spray metal
molds, compression molds, high
temperature laminating molds and parts to
be used in high temperature applications.
SikaBiresin L337 can be used with Sika s
intermediate-to-high temperature surface
coats: ES-229, SP-707, or ES-224.
Properties
SikaBiresin L337 (A)
Resin
SikaBiresin L337 (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
Mix ratio by volume
100
100
16
21
Aspect Gray liquid Clear amber liquid
Color (mixed) n/a Grey
Viscosity Brookfield (mixed) n/a 3,000 – 5,000 cps
Density at 77 F (25 C) (mixed) n/a 10.51 lbs./gal
Pot life (228g) at 77 F (25 C) n/a 45 – 60 Minutes
SikaBiresin
L337
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikaindustry.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM UNLESS NOTED)
PROCESSING
Preliminary self-support cure schedule: Cure
for 24 hours at 77 F (25 C) + 4 hours at 125 F
(51.6 C) – 140 F (60 C) range. You may attach
support structure and demold tool after this
schedule is completed before additional cure
is given.
Alternative post-cure options can be used, if
needed, in processing. Contact Sika Corporation s
Industry Technical Services Department at
tsmh@us.sika.com for additional information and
advice.
Heating and cooling rates during post-cure:
Always allow tools made with Sika high
temperature systems to gel at room
temperature before subjecting them to post
cure (24 hours is usually sufficient). This will
prevent excessive exotherm and shrink stress
from occurring. When oven curing laminated
molds, always place mold in a room
temperature oven and increase temperature
at a rate of no more than 50 F (30 C) per hour.
When heat cure is completed, turn off oven
and allow molds to remain in the oven. Never
remove mold from oven until mold
temperature has been lowered to less than
100 F (38 C).
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardeners is 24 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Keep containers
tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1 -800-424-9300,
International703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
SikaBiresin L337 (A)
Resin
SikaBiresin L337 (B)
Hardener
Hardness, Shore D, ASTM D2240 88
Flexural strength, ASTM D790
A
39,035psi (269MPa)
Flexural modulus, ASTM D790
A
1,300,000psi (8,963MPa)
Tensile strength, ASTM D638
A
27,285psi (188MPa)
Compressive strength, ASTM D695 14,930 psi (103 MPa)
Izod Impact Strength (notched) , ASTM D256 5.29 in-lbf/in
Glass Transition Temperature (Tg by DMA) 238 F (115 C)
Coefficient of thermal expansion – TMA 24 ppm/ F (43 ppm/ C)
(A)
6-Layer, 10 ounce glass fabric laminate
Cured 24 hours at 77 F (25 C) + 2 hours at 150 F (66 C) + 2 hours at 200 F (93 C) + 2 hours at 250 F (121 C) + 3 hours at 300 F
(149 C).
by | Sep 27, 2025
SikaBiresin CR
128
1 /
2
PRODUCT DATA SHEET
SikaBiresin CR128
Version 01.01 (08 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin CR128 (Formerly EL-336)
Unfilled Epoxy Laminating System for High Temperature Applications
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin CR128 is an unfilled, non- staining,
epoxy laminating system that provides room
temperature hardening (B Stage) and is
designed for high temperature laminating and
tooling applications. SikaBiresin CR128 has
excellent handling properties and fabric wet-
out to produce a void free tool with high
dimensional stability. SikaBiresin CR128 is
availble with a choice of two hardener options
with different pot lifes for process flexibility.
Tools made with SikaBiresin CR128 can be used
at continuous temperatures of 230 F (110 C)
and up to a 250 F (121 C) intermittent use
maximums. While SikaBiresin CR128 will gel at
room temperature, it must be post-cured to
achieve ultimate strength.
PRODUCT BENEFITS
– For applications up to 250 F (121 C)
– High mechanical properties
– Two hardener choices (fast and slow)
– Excellent cloth wet-out
– Excellent dimensional stability
– Good handling properties
AREAS OF APPLICATION
Typical applications include vacuum form
molds, prototype injection molds, high
temperature bonding fixtures, spray metal
molds, compression molds, high temperature
laminating molds and parts for intermediate
to high temperature applications
SikaBiresin CR128 can be used with Sika s h igh
temperature surface coats SP-707, ES-221, or
ES-224.
Properties
SikaBiresin CR128 (A)
Resin
SikaBiresin CH128-2 (B)
Hardener
SikaBiresin CH128-4 (B)
Hardener
Composition Epoxy Amine Amine
Mix ratio by weight 100 22 27
Aspect Clear liquid Clear liquid Clear liquid
Color (mixed) n/a Clear Clear amber
Viscosity Brookfield (mixed) n/a 2,000 – 3,000 cps 1,400 cps 1,600
Density at 77 F (25 C) (mixed) n/a 9.51 lbs./gal n/a
Pot life (228g) at 77 F (25 C) n/a 35 – 50 Minutes 120 140 Minutes
SikaBiresin
CR
128
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikaindustry.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
PROCESSING
Preliminary self-support cure schedule: Cure
for 24 hours at 77 F (25 C) + 4 hours at 125 F
(51.6 C) – 140 F (60 C). You may attach
support structure and demold tool after this
schedule is completed before additional cure
is given.
Alternative post-cure options can be used, if
needed, in processing. Contact Sika Corporation s
Industry Technical Services Department at
tsmh@us.sika.com for additional information and
advice.
Heating and cooling rates durng post-cure:
Always allow tools made with Sika high
temperature systems to gel at room
temperature before subjecting them to post
cure (24 hours is usually sufficient). This will
prevent excessive exotherm and shrink stress
from occurring. When oven curing laminated
molds, always place mold in a room
temperature oven and increase temperature
at a rate of no more than 50 F (30 C) per hour.
When heat cure is completed, turn off oven
and allow molds to remain in the oven. Never
remove mold from oven until mold
temperature has been lowered to less than
100 F (38 C).
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardeners is 24 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Keep containers
tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
Mixed with SikaBiresin CR128 (A) Resin
SikaBiresin CH128-2 (B)
Hardener
SikaBiresin CH128-4 (B)
Hardener
Shore D hardness, ASTM D2240 88 88
Compressive strength, ASTM D695 13,390 psi (92 MPa) 15,910 psi (110 MPa)
Tensile elongation, ASTM D638 3.0% n/a
Heat Distortion Temperature (HDT) (66 psi)
(264 psi)
n/a
n/a
278 F (137 C)
263 F (128 C)
Coefficient of Thermal Expansion (CTE) – TMA 30 ppm/ F (54 ppm/ C) n/a
Notched Impact strength, ASTM D256 7.0 in-lbf/in n/a
Cured 24 hours at 77 F (25 C) + 2 hours at 150 F (66 C) + 2 hours at 200 F (93 C) + 2 hours at 250 F (121 C) + 3 hours at 300 F
(149 C).
by | Sep 27, 2025
SikaBiresin CR
128
1 /
2
PRODUCT DATA SHEET
SikaBiresin CR128
Version 01.01 (08 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin CR128 (Formerly EL-336)
Unfilled Epoxy Laminating System for High Temperature Applications
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin CR128 is an unfilled, non- staining,
epoxy laminating system that provides room
temperature hardening (B Stage) and is
designed for high temperature laminating and
tooling applications. SikaBiresin CR128 has
excellent handling properties and fabric wet-
out to produce a void free tool with high
dimensional stability. SikaBiresin CR128 is
availble with a choice of two hardener options
with different pot lifes for process flexibility.
Tools made with SikaBiresin CR128 can be used
at continuous temperatures of 230 F (110 C)
and up to a 250 F (121 C) intermittent use
maximums. While SikaBiresin CR128 will gel at
room temperature, it must be post-cured to
achieve ultimate strength.
PRODUCT BENEFITS
– For applications up to 250 F (121 C)
– High mechanical properties
– Two hardener choices (fast and slow)
– Excellent cloth wet-out
– Excellent dimensional stability
– Good handling properties
AREAS OF APPLICATION
Typical applications include vacuum form
molds, prototype injection molds, high
temperature bonding fixtures, spray metal
molds, compression molds, high temperature
laminating molds and parts for intermediate
to high temperature applications
SikaBiresin CR128 can be used with Sika s h igh
temperature surface coats SP-707, ES-221, or
ES-224.
Properties
SikaBiresin CR128 (A)
Resin
SikaBiresin CH128-2 (B)
Hardener
SikaBiresin CH128-4 (B)
Hardener
Composition Epoxy Amine Amine
Mix ratio by weight 100 22 27
Aspect Clear liquid Clear liquid Clear liquid
Color (mixed) n/a Clear Clear amber
Viscosity Brookfield (mixed) n/a 2,000 – 3,000 cps 1,400 cps 1,600
Density at 77 F (25 C) (mixed) n/a 9.51 lbs./gal n/a
Pot life (228g) at 77 F (25 C) n/a 35 – 50 Minutes 120 140 Minutes
SikaBiresin
CR
128
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikaindustry.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
PROCESSING
Preliminary self-support cure schedule: Cure
for 24 hours at 77 F (25 C) + 4 hours at 125 F
(51.6 C) – 140 F (60 C). You may attach
support structure and demold tool after this
schedule is completed before additional cure
is given.
Alternative post-cure options can be used, if
needed, in processing. Contact Sika Corporation s
Industry Technical Services Department at
tsmh@us.sika.com for additional information and
advice.
Heating and cooling rates durng post-cure:
Always allow tools made with Sika high
temperature systems to gel at room
temperature before subjecting them to post
cure (24 hours is usually sufficient). This will
prevent excessive exotherm and shrink stress
from occurring. When oven curing laminated
molds, always place mold in a room
temperature oven and increase temperature
at a rate of no more than 50 F (30 C) per hour.
When heat cure is completed, turn off oven
and allow molds to remain in the oven. Never
remove mold from oven until mold
temperature has been lowered to less than
100 F (38 C).
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardeners is 24 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Keep containers
tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
Mixed with SikaBiresin CR128 (A) Resin
SikaBiresin CH128-2 (B)
Hardener
SikaBiresin CH128-4 (B)
Hardener
Shore D hardness, ASTM D2240 88 88
Compressive strength, ASTM D695 13,390 psi (92 MPa) 15,910 psi (110 MPa)
Tensile elongation, ASTM D638 3.0% n/a
Heat Distortion Temperature (HDT) (66 psi)
(264 psi)
n/a
n/a
278 F (137 C)
263 F (128 C)
Coefficient of Thermal Expansion (CTE) – TMA 30 ppm/ F (54 ppm/ C) n/a
Notched Impact strength, ASTM D256 7.0 in-lbf/in n/a
Cured 24 hours at 77 F (25 C) + 2 hours at 150 F (66 C) + 2 hours at 200 F (93 C) + 2 hours at 250 F (121 C) + 3 hours at 300 F
(149 C).
by | Sep 27, 2025
SikaBiresin CR
101
1 /
2
PRODUCT DATA SHEET
SikaBiresin CR101
Version 01.01 (08 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin CR101 (Formerly EL-335)
Toughened Epoxy Laminating System with High Impact Resistance
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin CR101 is a high-performance,
toughened laminating system developed for
intermediate temperature laminating
applications up to approximately 225 F
(107 C). SikaBiresin CR101 composites exhibit
increased impact resistance in the fabrication
of parts which will be used in a intermediate
heat temperature environment where
stability and performance are required.
SikaBiresin CR101 is availble with a choice of
two hardener options with different pot lifes
for process flexibility.
PRODUCT BENEFITS
– For applications up to approximately 225 F
(107 C)
– High impact resistance and toughness
– Two hardener choices (fast and slow)
– Excellent cloth wet -out
– Good elongation
– Increased hardness at elevated
temperatures
– Excellent dimensional stability
– Good mechanical shock properties
AREAS OF APPLICATION
SikaBiresin CR101 is used for
prototypes, patterns, master models,
tough composites parts, trim, holding
and checking fixtures, intermediate
temperature use splash molds, and
potting bushings. SikaBiresin CR101 c an be
used for laminating with graphite, EL-Glass,
S-Glass and Kevlar fabrics.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin CR101 (A)
Resin
SikaBiresin CH101-2 (B)
Hardener
SikaBiresin CH101-3 (B)
Hardener
Composition Epoxy Amine Amine
Mix ratio by weight 100 20 13
Aspect Clear liquid Clear liquid Clear liquid
Color (mixed) n/a Light amber Light amber
Viscosity Brookfield (mixed) n/a 1,500 cps 2,500 cps
Density at 77 F (25 C) (mixed) n/a 14.18 lbs./gal 9.34 lbs./gal
Pot life (228g) at 77 F (25 C) n/a 40 – 60 Minutes 85 95 Minutes
SikaBiresin
CR
101
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikaindustry.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
Cure schedule: 24 H ours at room temperature + 4 hours at 212 F (100 C)
PROCESSING
Alternative post-cure options can be used, if
needed, in processing. Contact Sika Corporation s
Industry Technical Services Department at
tsmh@us.sika.com for additional information and
advice.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardeners is 24 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452
Properties, Test Method
Mixed with SikaBiresin CR101 (A) Resin
SikaBiresin CH101-2 (B)
Hardener
SikaBiresin CH101-3 (B)
Hardener
Shore D hardness, ASTM D2240 86 87
Compressive strength, ASTM D695 16,500 psi (114 MPa) 16,860 psi (116 MPa)
Tensile elongation, ASTM D638 4.0% 2.0%
Heat deflection temperature (66 psi), ASTM D648
(264 psi), ASTM D648
196 F (91 C)
185 F (85 C)
214 F (101 C)
201 F (94 C)
Coefficient of Thermal Expansion (CTE) 34 ppm/ F (61 ppm/ C) 34 ppm/ F (61 ppm/ C)
Impact strength (cast bar) 10.64 in-lbf/in 12.15 in-lbf/in
by | Sep 27, 2025
SikaBiresin CR
101
1 /
2
PRODUCT DATA SHEET
SikaBiresin CR101
Version 01.01 (08 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin CR101 (Formerly EL-335)
Toughened Epoxy Laminating System with High Impact Resistance
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin CR101 is a high-performance,
toughened laminating system developed for
intermediate temperature laminating
applications up to approximately 225 F
(107 C). SikaBiresin CR101 composites exhibit
increased impact resistance in the fabrication
of parts which will be used in a intermediate
heat temperature environment where
stability and performance are required.
SikaBiresin CR101 is availble with a choice of
two hardener options with different pot lifes
for process flexibility.
PRODUCT BENEFITS
– For applications up to approximately 225 F
(107 C)
– High impact resistance and toughness
– Two hardener choices (fast and slow)
– Excellent cloth wet -out
– Good elongation
– Increased hardness at elevated
temperatures
– Excellent dimensional stability
– Good mechanical shock properties
AREAS OF APPLICATION
SikaBiresin CR101 is used for
prototypes, patterns, master models,
tough composites parts, trim, holding
and checking fixtures, intermediate
temperature use splash molds, and
potting bushings. SikaBiresin CR101 c an be
used for laminating with graphite, EL-Glass,
S-Glass and Kevlar fabrics.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin CR101 (A)
Resin
SikaBiresin CH101-2 (B)
Hardener
SikaBiresin CH101-3 (B)
Hardener
Composition Epoxy Amine Amine
Mix ratio by weight 100 20 13
Aspect Clear liquid Clear liquid Clear liquid
Color (mixed) n/a Light amber Light amber
Viscosity Brookfield (mixed) n/a 1,500 cps 2,500 cps
Density at 77 F (25 C) (mixed) n/a 14.18 lbs./gal 9.34 lbs./gal
Pot life (228g) at 77 F (25 C) n/a 40 – 60 Minutes 85 95 Minutes
SikaBiresin
CR
101
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikaindustry.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
Cure schedule: 24 H ours at room temperature + 4 hours at 212 F (100 C)
PROCESSING
Alternative post-cure options can be used, if
needed, in processing. Contact Sika Corporation s
Industry Technical Services Department at
tsmh@us.sika.com for additional information and
advice.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardeners is 24 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452
Properties, Test Method
Mixed with SikaBiresin CR101 (A) Resin
SikaBiresin CH101-2 (B)
Hardener
SikaBiresin CH101-3 (B)
Hardener
Shore D hardness, ASTM D2240 86 87
Compressive strength, ASTM D695 16,500 psi (114 MPa) 16,860 psi (116 MPa)
Tensile elongation, ASTM D638 4.0% 2.0%
Heat deflection temperature (66 psi), ASTM D648
(264 psi), ASTM D648
196 F (91 C)
185 F (85 C)
214 F (101 C)
201 F (94 C)
Coefficient of Thermal Expansion (CTE) 34 ppm/ F (61 ppm/ C) 34 ppm/ F (61 ppm/ C)
Impact strength (cast bar) 10.64 in-lbf/in 12.15 in-lbf/in
by | Sep 27, 2025
by | Sep 27, 2025
SikaBiresin
L325 HT
FR
1 /
2
PRODUCT DATA SHEET
SikaBiresin L325 HT
Version 01.01 (07 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin L325 HT (Formerly EL-325HTTC)
Lightweight Composite Tooling Compound/ Tooling Dough with High Temperature Resistance
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin
L325 HT is an epoxy-based,
composite tooling compound designed for
the construction of tools, jigs, models, and
other tooling that are exposed to elevated
temperatures.. The neutral resin and black
hardener give a uniform dark gray color
when thoroughly mixed that is pliable and
can be applied to the tool surface without
crumbling or cracking. Tools constructed
with SikaBiresin
L325 HT maintain a very
high degree of dimensional stability, are
light weight, and can be machined as well
as drilled and tapped. The SikaBiresin
L325 HT resin and harder are both
syntactic compounds, which minimize
splash hazards, in comparison to standard,
high temperature epoxy laminating
systems.
PRODUCT BENEFITS
– Colored resin and hardener for mix
indication
– High temperature resistance
– Pliable and formable with no cracking or
crumbling when mixed
– Can be machined or drilled and tapped
– Low density (lightweight)
– Very low coefficient of thermal expansion
(CTE) for excellent dimensional stability
– Low exotherm build
AREAS OF APPLICATION
SikaBiresin
L325 HT is ideal for lightweight
composite sandwich tools and structures. It is used
for tools, jigs, models, and other application types.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin L325 HT (A)
Resin
SikaBiresin L325 HT (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
by volume
100
100
25
27
Aspect Dough Dough
Color White Black
Color (mixed) n/a Gray
Density at 77 F (25 C) (mixed) n/a .023 lbs/in
3
(.633 g/cc)
Work life (400g) at 77 F (25 C) n/a 1.5 2.0 hours
Peak Exotherm (1 lb. mass) n/a 130 F (54 C)
SikaBiresin
L325 HT
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikausa.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES
Cure schedule: 24 h ours at room temperature + 6 hours at 150 F (65.5 C) + 1 hour at 200 F (93 C) + 1 hour at 250 F (121 C)
+ 1 hour at 300 F (149 C) + 3 hours at 350 F (177 C)
PROCESSING
For sandwhich structure tools, it is necessary
to apply a slurry mixture, which serves as a
bond coat, between the laminate and
SikaBiresin EL325 HT tooling compound. For
more detailed instructions, please refer ence
the Compostire Sandwhich Tool Construction
Application Guide.
A prelimInary self-support
cure schedule can be used on a model, mold
or plug. Cure for 24 hours at 77 F (25 C) + 6
hours at 150 F (66 C). You may attach support
structure and de- mold the tool after this
schedule is completed, prior to applying post-
cure. Alternative post-cure options can be used,
if needed, in processing. Contact Sika
Corporation s Industry Technical Services
Department at tsmh@us.sika.com for additional
information and advice.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardener is 12 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
SikaBiresin EL325 HT (A)
Resin
SikaBiresin EL325 HT (B)
Hardener
Hardness, ASTM D2240 65 – 70
Flexural strength, ASTM D790 9,600 psi (66 MPa)
Flexural modulus, ASTM D790 540,000 psi (3,723 MPa)
Compressive strength, ASTM D695 4,900 psi (34 MPa)
Heat Deflection Temperature (66 psi), ASTM D648 425 F (218 C)
Coefficient of thermal expansion (TMA) 9 ppm/ F (16 ppm/ C)
by | Sep 27, 2025
SikaBiresin
L325 HT
FR
1 /
2
PRODUCT DATA SHEET
SikaBiresin L325 HT
Version 01.01 (07 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin L325 HT (Formerly EL-325HTTC)
Lightweight Composite Tooling Compound/ Tooling Dough with High Temperature Resistance
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin
L325 HT is an epoxy-based,
composite tooling compound designed for
the construction of tools, jigs, models, and
other tooling that are exposed to elevated
temperatures.. The neutral resin and black
hardener give a uniform dark gray color
when thoroughly mixed that is pliable and
can be applied to the tool surface without
crumbling or cracking. Tools constructed
with SikaBiresin
L325 HT maintain a very
high degree of dimensional stability, are
light weight, and can be machined as well
as drilled and tapped. The SikaBiresin
L325 HT resin and harder are both
syntactic compounds, which minimize
splash hazards, in comparison to standard,
high temperature epoxy laminating
systems.
PRODUCT BENEFITS
– Colored resin and hardener for mix
indication
– High temperature resistance
– Pliable and formable with no cracking or
crumbling when mixed
– Can be machined or drilled and tapped
– Low density (lightweight)
– Very low coefficient of thermal expansion
(CTE) for excellent dimensional stability
– Low exotherm build
AREAS OF APPLICATION
SikaBiresin
L325 HT is ideal for lightweight
composite sandwich tools and structures. It is used
for tools, jigs, models, and other application types.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin L325 HT (A)
Resin
SikaBiresin L325 HT (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
by volume
100
100
25
27
Aspect Dough Dough
Color White Black
Color (mixed) n/a Gray
Density at 77 F (25 C) (mixed) n/a .023 lbs/in
3
(.633 g/cc)
Work life (400g) at 77 F (25 C) n/a 1.5 2.0 hours
Peak Exotherm (1 lb. mass) n/a 130 F (54 C)
SikaBiresin
L325 HT
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikausa.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES
Cure schedule: 24 h ours at room temperature + 6 hours at 150 F (65.5 C) + 1 hour at 200 F (93 C) + 1 hour at 250 F (121 C)
+ 1 hour at 300 F (149 C) + 3 hours at 350 F (177 C)
PROCESSING
For sandwhich structure tools, it is necessary
to apply a slurry mixture, which serves as a
bond coat, between the laminate and
SikaBiresin EL325 HT tooling compound. For
more detailed instructions, please refer ence
the Compostire Sandwhich Tool Construction
Application Guide.
A prelimInary self-support
cure schedule can be used on a model, mold
or plug. Cure for 24 hours at 77 F (25 C) + 6
hours at 150 F (66 C). You may attach support
structure and de- mold the tool after this
schedule is completed, prior to applying post-
cure. Alternative post-cure options can be used,
if needed, in processing. Contact Sika
Corporation s Industry Technical Services
Department at tsmh@us.sika.com for additional
information and advice.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardener is 12 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
SikaBiresin EL325 HT (A)
Resin
SikaBiresin EL325 HT (B)
Hardener
Hardness, ASTM D2240 65 – 70
Flexural strength, ASTM D790 9,600 psi (66 MPa)
Flexural modulus, ASTM D790 540,000 psi (3,723 MPa)
Compressive strength, ASTM D695 4,900 psi (34 MPa)
Heat Deflection Temperature (66 psi), ASTM D648 425 F (218 C)
Coefficient of thermal expansion (TMA) 9 ppm/ F (16 ppm/ C)
by | Sep 27, 2025
SikaBiresin
L325 HT
FR
1 /
2
PRODUCT DATA SHEET
SikaBiresin L325 HT
Version 01.01 (07 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin L325 HT (Formerly EL-325HTTC)
Lightweight Composite Tooling Compound/ Tooling Dough with High Temperature Resistance
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin
L325 HT is an epoxy-based,
composite tooling compound designed for
the construction of tools, jigs, models, and
other tooling that are exposed to elevated
temperatures.. The neutral resin and black
hardener give a uniform dark gray color
when thoroughly mixed that is pliable and
can be applied to the tool surface without
crumbling or cracking. Tools constructed
with SikaBiresin
L325 HT maintain a very
high degree of dimensional stability, are
light weight, and can be machined as well
as drilled and tapped. The SikaBiresin
L325 HT resin and harder are both
syntactic compounds, which minimize
splash hazards, in comparison to standard,
high temperature epoxy laminating
systems.
PRODUCT BENEFITS
– Colored resin and hardener for mix
indication
– High temperature resistance
– Pliable and formable with no cracking or
crumbling when mixed
– Can be machined or drilled and tapped
– Low density (lightweight)
– Very low coefficient of thermal expansion
(CTE) for excellent dimensional stability
– Low exotherm build
AREAS OF APPLICATION
SikaBiresin
L325 HT is ideal for lightweight
composite sandwich tools and structures. It is used
for tools, jigs, models, and other application types.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin L325 HT (A)
Resin
SikaBiresin L325 HT (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
by volume
100
100
25
27
Aspect Dough Dough
Color White Black
Color (mixed) n/a Gray
Density at 77 F (25 C) (mixed) n/a .023 lbs/in
3
(.633 g/cc)
Work life (400g) at 77 F (25 C) n/a 1.5 2.0 hours
Peak Exotherm (1 lb. mass) n/a 130 F (54 C)
SikaBiresin
L325 HT
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikausa.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES
Cure schedule: 24 h ours at room temperature + 6 hours at 150 F (65.5 C) + 1 hour at 200 F (93 C) + 1 hour at 250 F (121 C)
+ 1 hour at 300 F (149 C) + 3 hours at 350 F (177 C)
PROCESSING
For sandwhich structure tools, it is necessary
to apply a slurry mixture, which serves as a
bond coat, between the laminate and
SikaBiresin EL325 HT tooling compound. For
more detailed instructions, please refer ence
the Compostire Sandwhich Tool Construction
Application Guide.
A prelimInary self-support
cure schedule can be used on a model, mold
or plug. Cure for 24 hours at 77 F (25 C) + 6
hours at 150 F (66 C). You may attach support
structure and de- mold the tool after this
schedule is completed, prior to applying post-
cure. Alternative post-cure options can be used,
if needed, in processing. Contact Sika
Corporation s Industry Technical Services
Department at tsmh@us.sika.com for additional
information and advice.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardener is 12 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
SikaBiresin EL325 HT (A)
Resin
SikaBiresin EL325 HT (B)
Hardener
Hardness, ASTM D2240 65 – 70
Flexural strength, ASTM D790 9,600 psi (66 MPa)
Flexural modulus, ASTM D790 540,000 psi (3,723 MPa)
Compressive strength, ASTM D695 4,900 psi (34 MPa)
Heat Deflection Temperature (66 psi), ASTM D648 425 F (218 C)
Coefficient of thermal expansion (TMA) 9 ppm/ F (16 ppm/ C)
by | Sep 27, 2025
SikaBiresin
L3
23
1 /
2
PRODUCT DATA SHEET
SikaBiresin L323
Version 01.01 (09 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin L323 (Formerly EL-323TC)
Lightweight Composite Tooling Compound/ Tooling Dough
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin
L323 is an epoxy-based,
composite tooling compound designed for
the construction of tools, jigs, models,
sandwich structures and other tooling or
modeling applications. When mixed the
system results in a very pliable elastic
compound which can be applied to the
tool surface without crumbling or cracking.
SikaBiresin
L323 can be applied at any
thickness above ” without excessive
exotherm. Tools constructed with
SikaBiresin L323 maintain a very high
degree of dimensional stability, are light in
weight, and can be machined as well as
drilled and tapped. The SikaBiresin
L323
resin and harder are both syntactic dough
compounds, which minimize splash
hazards, in comparison to standard, room
temperature epoxy laminating systems.
PRODUCT BENEFITS
– Colored resin and hardener for mix
indication
– Pliable and formable with no cracking or
crumbling when mixed
– Can be machined or drilled and tapped
– Low density (lightweight)
– Very low coefficient of thermal expansion
(CTE) for excellent dimensional stability
– Low exotherm build
AREAS OF APPLICATION
SikaBiresin
L323 is ideal for lightweight
composite sandwich tools and structures. It is used
for tools, jigs, fixtures, models, and other
application types. SikaBiresin
L323 can also be
used for artistic formable models.
Tests with actual materials and conditions
have to be performed to ensure satisfactory
performance.
Properties
SikaBiresin L323 (A)
Resin
SikaBiresin L323 (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
by volume
100
100
100
93
Aspect Dough Dough
Color Yellow Blue
Color (mixed) Green
Density at 77 F (25 C) (mixed) .025 lbs/in
3
(.690 g/cc)
Work life (400g) at 77 F (25 C) 2.0 – 2.5 hours
Peak Exotherm (1 lb. mass) 105 F (41 C)
SikaBiresin
L32
3
2
/
2
Sika Corporation
30800 Stephenson Highway
Madison Heights, MI 48071
U.S.A.
Telephone: +1 248- 577-0020
Email: tsmh@us.sika.com
www.sikausa.com
TYPICAL MECHANICAL AND THERMAL PROPERTIES
(A)
Sandwich construction with three layers of 10 oz glass fabric laminate on either side of of SikaBiresin L323, and a single surface coat
Cure schedule: Cured 7 days at room temperature.
PROCESSING
For sandwich structure tools, it is necessary to
apply a slurry mixture, which serves as a bond
coat, between the laminate and SikaBiresin
L323 tooling compound. For more detailed
instructions, please reference the Composite
Sandwich Tool Construction Application
Guide.
Normal health and safety precautions should be
observed when handling these products:
Ensure adequate ventilation
Wear gloves, glasses, and protective clothes
For further information, please consult the Safety
Data Sheets
STORAGE CONDITIONS
Shelf life of resin and hardener is 12 months
when stored in original, unopened containers
between 65-77 F (15 – 25 C). Any opened can
must be tightly closed.
PACKAGING INFORMATION
Packaging information is available upon
request. Please contact your local Sika sales
representative.
FURTHER INFORMATION
Advice on specific applications will be given on
request. To contact Sika Corporation s Industry
Technical Services Department, send an email to
tsmh@us.sika.com. Copies of Safety Data
Sheets and Product Data Sheets are available
upon request.
BASIS OF PRODUCT DATA
All technical data stated in this document are
based on laboratory tests. Actual measured data
may vary due to circumstances beyond our
control.
ENVIRONMENTAL, HEALTH AND SAFETY
For further information and advice regarding
transportation, handling, storage and disposal of
chemical products, user should refer to the
actual Safety Data Sheets containing physical,
environmental, toxicological and other safety
related data. User must read the current
actual Safety Data Sheets before using any
products. In case of an emergency, call
CHEMTREC at 1-800-424-9300, International
703-527-3887.
LEGAL DISCLAIMER
Prior to each use of any product of Sika Corporation,
its subsidiaries or affiliates ( SIKA ), the user must
always read and follow the warnings and
instructions on the product s most current product
label, Product Data Sheet and Safety Data Sheet
which are available at usa.sika.com or by contacting
SIKA s Technical Service Department via email at
tsmh@us.sika.com. Nothing contained in any SIKA
literature or materials relieves the user of the
obligation to read and follow the warnings and
instructions for each SIKA product as set forth in the
current product label, Product Data Sheet and
Safety Data Sheet prior to use of the SIKA product.
SIKA warrants this product for one year from date
of installation to be free from manufacturing
defects and to meet the technical properties on the
current Product Data Sheet if used as directed
within the product s shelf life. User determines
suitability of product for intended use and assumes
all risks. User s and/or buyer s sole remedy shall be
limited to the purchase price or replacement of this
product exclusive of any labor costs. NO OTHER
WARRANTIES EXPRESS OR IMPLIED SHALL APPLY
INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. SIKA SHALL NOT BE LIABLE
UNDER ANY LEGAL THEORY FOR SPECIAL OR
CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE
RESPONSIBLE FOR THE USE OF THIS PRODUCT IN A
MANNER TO INFRINGE ON ANY PATENT OR ANY
OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY
OTHERS. Sale of SIKA products are subject to the
Terms and Conditions of Sale which are available at
https://usa.sika.com/en/group/SikaCorp/termsand
conditions.html or by calling +1 800-933-7452.
Properties, Test Method
SikaBiresin L323 (A)
Resin
SikaBiresin L323 (B)
Hardener
Hardness, shore D ASTM D2240 60
Volumetric weight .025 lbs/in
3
(.690 g/cc)
Flexural strength, ASTM D790
A
13,050 psi (90 MPa)
Flexural modulus, ASTM D790
A
1,027,000 psi (7,081 MPa)
Compressive Strength, ASTM D695
A
6,144 psi (42 Mpa)
Notched Izod Impact Strength, ASTM D256
A
20.9 In-lbs
Coefficient of thermal expansion (TMA) 3 ppm/ F (6 ppm/ C)
