SikaBiresin CR
161
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PRODUCT DATA SHEET
SikaBiresin CR161
Version 01.01 (09 – 2023), en_US
PRODUCT DATA SHEET
SikaBiresin CR161 (Formerly EPOLAM 2070NA)
Epoxy Laminating and Infusion System for High Temperature Applications
TYPICAL PHYSICAL PROPERTIES (FOR FURTHER VALUES SEE SAFETY DATA SHEET)
DESCRIPTION
SikaBiresin CR161 is an epoxy-based
laminating and infusion system designed
for use in the production of high
temperature use composite tooling and
structures by typical impregnation methods
(infusion, wet-lay-up).
PRODUCT BENEFITS
– High Tg capability
– Low mixed viscosity
– Long pot life
– Excellent final properties after post-cure
AREAS OF APPLICATION
SikaBiresin CR161 is used for
high temperature use composite
tools and parts for aerospace and
a variety of other industries. It is
suitable for infusion processing,
wet-layup, and vacuum bagging
processes.
TYPICAL MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
Cured 24 hours at 77 F (25 C) + 16 hours at 248 F (120 C)
Properties
SikaBiresin CR161 (A)
Resin
SikaBiresin CH161-6 (B)
Hardener
Composition Epoxy Amine
Mix ratio by weight
Mix ratio by volume
100
100
31
35
Aspect Clear Liquid Clear liquid
Color (mixed) Clear liquid
Viscosity Brookfield (mixed) 450 cps
Pot life (150g) at 77 F (25 C) 125 – 155 Minutes
Properties, Test Method
SikaBiresin CR161 (A)
Resin
SikaBiresin CH161-6 (B)
Hardener
Hardness – Shore D, ASTM 2240 82
Tensile strength, ASTM D638 5,100 psi (35 MPa)
Tensile modulus, ASTM D638 465,000 psi (4,969 MPa)
Flexural strength, ASTM D790 8,800 psi (61 MPa)
Flexural modulus, ASTM D790 392,000 psi (2,700 MPa)
Glass Transition Temperature (Tg), DSC method 289 F (143 C)
Coefficient of Thermal Expansion
Range: +50 F (10 C) 176 F (80 C)
35 m/m F (64 m/m C)
SikaBiresin
CR
161
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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
PROCESSING
After mixing according to the required ratio,
carry out impregnation of the reinforcements.
To ensure an optimal and good impregnation,
material must be used at a temperature above
68 F (20 C). **Please note: Do not allow
excess mixed material to remain in bulk; pour
into a thin sheet and allow to cure. Excessive
amounts of mixed material in bulk has a
potential of high exotherm with possible
violent reactivity.
Preliminary self-support cure schedule:
Final Tg is greatly impacted by post cure
temperature and time. To reduce the risk of
distortion and minimize tool shrinkage, a
precise post cure schedule is recommended.
Demolding should be conducted only after a
minimum self-supporting cure of 12 hours at
104 F (40 C). A support fixture is
recommended for complex shapes. Please
use a heating rate of 36 F (20 C) maximum
per hour between stages and heat up and for
cool down. Variable cure temperture and
times can be used depending on final tool or
part requirements. Some potential cure
examples and Tg builds are:
8 Hours at 284 F (140 C) cure 302 F
(150 C) Tg
8 Hours at 302 F (150 C) cure 320 F
(160 C) Tg
48 Hours at 302 F (150 C)
cure 327 F(164 C) Tg
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 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.