by | Sep 27, 2025
Technical Data Sheet
NOROX
MEKP-925
Methyl ethyl ketone peroxide
CAS#1338-23-4
Liquid mixture
Description
Norox MEKP-925 has a high MEKP dimer content that gives excellent
performance in most vinyl ester resins. Norox MEKP-925 also performs well
when used with general purpose ortho and isophthallic resins. Norox MEKP-
925 should be considered when an initiator is desired for use with most all
resin types.
Technical Data
Active Oxygen: 9.0% max.
Form: Liquid
Color: Water White
Specific Gravity @ 25 C: 1.10
Flash point (C.O.C.): 200 F, min.
Flash point (SETA C.C.): 170 F, min.
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
SADT <140 F (60 C)
Storage temp: <80 F(27 C)
Max Transport Temp: <80 F(27 C)
Application
Norox MEKP-925 is a methyl ethyl ketone peroxide composition
formulated to be an excellent cure initiator for both unsaturated
polyester resins and vinyl ester resins. With most unsaturated
polyesters it gives longer gel and gel to cure times but with a higher
peak exotherm than Norox MEKP-9, particularly in thick sections.
Technical Data Sheet
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of Norox MEKP-925 are cases of 4x8
lb/ 4x3.6 kg. polyethylene bottles; and 44 lb. or 20 kg Hedpacks. For
custom package sizes, please contact your local distributor or United
Initiators, Inc.
Classification Please refer to the specific Norox MEKP-925 Safety
Data Sheet under section 14, Shipping Description.
Norox MEKP-925 is available through a nation-wide distributor
network. Call United Initiators, Inc. for the name of the distributor in
your area.
This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.
Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.
by | Sep 27, 2025
Technical Data Sheet
NOROX
MEKP-925 RED
Methyl ethyl ketone peroxide
CAS#1338-23-4
Liquid mixture
Description
Norox MEKP-925 RED has a high MEKP dimer content that gives excellent
performance in most vinyl ester resins. Norox MEKP-925 RED also performs
well when used with general purpose ortho and isophthallic resins. Norox
MEKP-925 RED should be considered when an initiator is desired for use with
most all resin types. Note: The addition of the red dye added to this material
will aid in mixing.
Technical Data
Active Oxygen: 9.0% max.
Form: Liquid
Color: Red
Specific Gravity @ 25 C: 1.10
Flash point (C.O.C.): 200 F, min.
Flash point (SETA C.C.): 170 F, min.
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
SADT <140 F (60 C)
Storage temp: <80 F(27 C)
Max Transport Temp: <80 F(27 C)
Application
Norox MEKP-925 RED is a methyl ethyl ketone peroxide composition
formulated to be an excellent cure initiator for both unsaturated
polyester resins and vinyl ester resins. With most unsaturated
polyesters it gives longer gel and gel to cure times but with a higher
peak exotherm than Norox MEKP-9, particularly in thick sections.
Technical Data Sheet
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of Norox MEKP-925 RED are cases of
4x8 lb. polyethylene bottles; and 40 lb. or 20 kg Hedpacks. For
custom package sizes, please contact your local distributor or United
Initiators, Inc.
Classification Please refer to the specific Norox MEKP-925 RED
Safety Data Sheet under section 14, Shipping Description.
Norox MEKP-925 RED is available through a nation-wide distributor
network. Call United Initiators, Inc. for the name of the distributor in
your area.
This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.
Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.
by | Sep 27, 2025
Technical Data Sheet
NOROX
MEKP-925 FRED
Methyl ethyl ketone peroxide
CAS#1338-23-4
Liquid mixture
Description
NOROX
MEKP-925 FRED has a high MEKP dimer content that gives
excellent performance in most vinyl ester resins. NOROX
MEKP-925 FRED
also performs well when used with general purpose ortho and isophthallic
resins. NOROX
MEKP-925 RED should be considered when an initiator is
desired for use with most all resin types. Note: The addition of the red dye
added to this material will aid in mixing and indicate the progression of cure
when color fades away.
Technical Data
Active Oxygen: 9.0% max.
Form: Liquid
Color: Red
Specific Gravity @ 25 C: 1.10
Flash point (C.O.C.): 200 F, min.
Flash point (SETA C.C.): 170 F, min.
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
SADT <140 F (60 C)
Storage temp: <80 F(27 C)
Max Transport Temp: <80 F(27 C)
Application
NOROX
MEKP-925 FRED is a methyl ethyl ketone peroxide
composition formulated to be an excellent cure initiator for both
unsaturated polyester resins and vinyl ester resins. With most
unsaturated polyesters it gives longer gel and gel to cure times but with
a higher peak exotherm than NOROX
MEKP-9, particularly in thick
sections.
Technical Data Sheet
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of NOROX
MEKP-925 FRED are cases
of 4x8 lb. polyethylene bottles; and 40 lb. or 20 kg Hedpacks. For
custom package sizes, please contact your local distributor or United
Initiators, Inc.
Classification Please refer to the specific NOROX
MEKP-925
FRED Safety Data Sheet under section 14, Shipping Description.
NOROX
MEKP-925 FRED is available through a nation-wide
distributor network. Call United Initiators, Inc. for the name of the
distributor in your area.
This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.
Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 02.26.2020. Device M: TDS.
by | Sep 27, 2025
Technical Data Sheet
NOROX
MEKP-900
Methyl ethyl ketone peroxide
CAS#1338-23-4
Liquid mixture
Description
Norox MEKP-900 is a methyl ethyl ketone peroxide in phlegmatizer for the
curing of unsaturated polyester resins at ambient temperature in combination
with cobalt accelerators.
Technical Data
Active Oxygen: 9.0% max.
Free hydrogen peroxide content: 2.0% max.
Form: Liquid
Color: Water White
Specific Gravity @ 25 C: 1.14
Flash point (C.O.C.): 200 F, min.
Flash point (SETA C.C.): 170 F, min.
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
SADT: <140 F (60 C)
Storage temp: <80 F(27 C)
Max Transport Temp: <80 F(27 C)
Application
Norox MEKP-900 is a general purpose MEKP with a higher hydrogen
peroxide level and is our global general purpose workhorse of the
United Initiators, Inc. line. Norox MEKP-900 gives consistent room
temperature performance with resins. A reliable product of remarkable
purity, Norox MEKP-900 assures quality in almost every system. A
single MEKP initiator formulation cannot provide optimum results in all
resin system. Evaluation of each MEKP in each resin intended for use
is absolutely essential before full-scale manufacturing is attempted.
Technical Data Sheet
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of Norox MEKP-900 are cases of 4x8
lb/ 4x3.6kg. polyethylene bottles; and 40 lb./ 20 kg hedpacks. For
custom package sizes, please contact your local distributor or United
Initiators, Inc.
Classification Please refer to the specific Norox MEKP-900 Safety
Data Sheet under section 14, Shipping Description.
Norox MEKP-900 is available through a nation-wide distributor
network. Call United Initiators, Inc. for the name of the distributor in
your area.
This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.
Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.
by | Sep 27, 2025
Technical Data Sheet
NOROX
CHP
Cumenehydroperoxide
CAS#80-15-9
Liquid mixture
Description
NOROX
CHP is a colourless to pale yellow liquid solution of cumene
hydroperoxide. It is an economical free-radical initiator for unsaturated
polyester resins, vinyl monomers and styrenation of oils and alkyds. NOROX
CHP may be used singly or in combination with other peroxides in both
ambient and elevated temperature processes.
Technical Data
Appearance
Pale Yellow to Colourless liquid
Active oxygen 8.7 %
Cumene hydroperoxide 80-85 %
Flash point (Seta C.C.): > 72 C
Density at 20 C 1.05 g/cm
3
Soluble in : Alcohols, ketones, esters,
hydrocarbons
Slightly soluble in: Water
Critical temperature (SADT) 75 C
Recommended storage temperature Below 30 C.
Maintenance of activity at 30 C as
from date of delivery 6 months
Application
NOROX
CHP is especially suitable for the cure initiation of unsaturated
polyester resin systems at both ambient and elevated temperatures. The
typical exotherm curve exhibited is usually mild and flat leading to a gradual,
but thorough, cure. This characteristic can minimise crazing and cracking
especially in thick cross-sections. NOROX
CHP is normally used in pre-
promoted resin systems employing cobalt and/or manganese compounds as
the primary accelerators.
CAUTION: NOROX CHP SHOULD NE VER BE MIXED WITH ACIDS OR
DIRECTLY WITH PROMOTERS OR ACCELERATORS. A VIOLENT
DECOMPOSITION CAN OCCUR WHICH MAY RESULT IN A FIRE AND/OR
EXPLOSION.
Primarily, NOROX
CHP is used in combination with higher exotherm
producing peroxides when the normal operating temperature is under 82 C.
Technical Data Sheet
These combinations will result in lower peak exotherms with the exact
magnitude determined by the blend ratio. The use of NOROX
CHP in the
blend will lengthen the cure time but should not diminish the ultimate cure.
When operating at temperatures over 82 C, NOROX
CHP can behave
similar to high exotherm peroxide. Over 121 C, use of NOROX
CHP can give
exotherms exceeding those normally expected for dibenzoyl peroxide or
methyl ethyl ketone peroxide.
Measurements
Resin: Epoxy Vinylester resin* Temperature: 25 C
Initiator %: 1.5 Accelerator %: 0.10 % (12 % Cobalt) + 0.05 % DMA
Initiator Gel
time
Min
Time
to peak
min
Peak Exotherm
Temp C
935 Hardness
2 hr 3 hr 4 hr
934
Hardness
24 hr
NOROX
CHP
56 >236 28 0 0 0 7
NOROX
CHM-50
16 61 92 41 50 55 14
NOROX
MEKP-
925H
18 41 128 10 30 32 5
* Results determined by United Initiators laboratory test methods and are used
for comparison, only. Resin suppliers should be contacted for specific
recommendations for individual resins.
Packaging
The standard package size of NOROX
CHP is 25 kg polyethylene bottles.
Disclaimer
This information and all further technical advice are reflecting our present knowledge and experience based on internal tests with local raw materials with the purpose to inform about
our products and applications. The information should not be construed as guaranteeing specific properties of products described or their suitability for a particular application, nor as
providing complete instructions for use. The information implies no guarantee for product and shelf life properties, nor any liability or other legal responsibility on our part, including
with regard to existing third party intellectual property rights, especially patent rights. We reserve the right to make any changes according to technological progress or further
developments.
Application and usage of our products based on our technical advice is out of our control and sole responsibility of the user. The user is not released from the obligation to conduct
careful inspection and testing of incoming goods in order to verify the suitability for the intended application.
United Initiators
EU
United Initiators
Nafta
United Initiators
China
United Initiators
Australia
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 27.11.17. Device M: TDS.
by | Sep 27, 2025
TC-5140 A/B Page 1 of 2 Date: 07/12/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-5140 A/B
40 SHORE A TRANSLUCENT SILICONE RUBBER
TC-5140 A/B is a room temperature, addition/platinum curing silicone rubber designed for making molds and parts. Featuring
exceptional tear strength, low viscosity, 1:1 mix ratio, and a quick demold time, this system is user friendly while producing
high quality finished products. When used to make molds, the TC-5140 A/B is translucent enough to see through when casting
into the mold cavity. For making parts, this system is easily pigmented with BJB s 8100 Series Silicone Pigments.
High Tear Strength Fast Cure
Translucent/Easily Pigmented Gaskets and Parts
Low Viscosity Flexible Molds
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore A ASTM D 2240-04e1 40 5
Density (g/cc) ASTM D 792-00 1.161
Cubic Inches per Pound N/A 24.11
Color/Appearance Visual Colorless/Translucent
Tensile Strength (psi) ASTM D412-98a(2002)e1 1,060
Tensile Modulus (psi) ASTM D412-98a(2002)e1 375
Elongation (%) ASTM D412-98a(2002)e1 420
Tear Strength (pli) ASTM D 624-00e1 Die B 85
Shrinkage (in/in) linear ASTM D2566 @ 1 depth 0.007-0.008
Dielectric Constant, 1 MHz ASTM D150-87 3.37
Dissipation Factor, 1 MHz ASTM D150-87 0.0126
*Note: Reported physical properties are based on test specimens cured 24 hours at room temperature.
Shrink test specimens are cured for 7 days at room temperature.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 100 100
Specific Gravity @ 77 F (25 C) 1.157 1.144
Color Colorless Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 17,000 7,800
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 6,800
Work Time, 100g mass @ 77 F (25 C) 30 40 minutes
Gel Time 50 60 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Properties above are typical and not for specifications.
SILICONE CASTING RUBBERS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-5140 A/B Page 2 of 2 Date: 07/12/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
INHIBITION:
Certain materials will cause inhibition or neutralization of the curing agent. These materials include condensation/tin cured
based silicone, lacquer and enamel coatings, polyester-based products, copper or copper containing metals, some SLA 3D
Printing resins, and natural rubbers like latex. Inhibition may easily be determined by brushing a small quantity of TC-5140
A/B over a localized area of the surface to be reproduced. If the TC-5140 A/B is tacky or uncured after the cure time, then you
know the mold surface is acting as an inhibitor. To insure against possible problems, it is advisable to spray a barrier film over
any questionable surfaces. This is the best way of treating clays and other surfaces that cause inhibition. Contact BJB for
recommended products.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 12 months from date of
shipment when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Pint Kits 1 lb. 1 lb. 48
Quart Kits 2 lbs. 2 lbs. 96
Gallon Kits 8 lbs. 8 lbs. 386
5-Gallon Kits 40 lbs. 40 lbs. 1,929
55-Gallon Drum Kits 440 lbs. 440 lbs. 21,217
SAFETY PRECAUTIONS:
Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged
contact on the skin may cause an allergic reaction. Eye protection is extremely important. Always use approved safety glasses
or goggles when handling this product.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvents only increase contact and dry skin. Seek qualified
medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only
as directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Silicone Handling Guide
by | Sep 27, 2025
TC-5130 A/B Page 1 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-5130 A/B
25 SHORE A TRANSLUCENT SILICONE RUBBER
TC-5130 A/B is a room temperature, addition/platinum curing silicone rubber designed for making molds and parts. Featuring
exceptional tear strength, low viscosity, 1:1 mix ratio, and a quick demold time, this system is user friendly while producing
high quality finished products. When used to make molds, the TC-5130 A/B is translucent enough to see through when casting
into the mold cavity. For making parts, this system is easily pigmented with BJB s 8100 Series Silicone Pigments.
High Tear Strength Medical Simulations
Translucent/Easily Pigmented Props for Movie Special FX
Low Viscosity Flexible Molds
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore A ASTM D 2240-04e1 25 5
Density (g/cc) ASTM D 792-00 1.147
Cubic Inches per Pound N/A 24.12
Color/Appearance Visual Colorless/Translucent
Tensile Strength (psi) ASTM D412-98a(2002)e1 1,000
Tensile Modulus (psi) ASTM D412-98a(2002)e1 295
Elongation (%) ASTM D412-98a(2002)e1 500
Tear Strength (pli) ASTM D 624-00e1 Die B 115
Shrinkage (in/in) linear ASTM D2566 @ 1 depth Nil
Dielectric Constant, 1 MHz ASTM D150-87 3.371
Dissipation Factor, 1 MHz ASTM D150-87 0.0108
*Note: Reported physical properties are based on test specimens cured 24 hours at room temperature.
Shrink test specimens are cured for 7 days at room temperature.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 100 100
Specific Gravity @ 77 F (25 C) 1.138 1.142
Color Colorless Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 6,480 7,570
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 5,430
Work Time, 100g mass @ 77 F (25 C) 30 40 minutes
Gel Time 50 60 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Properties above are typical and not for specifications.
SILICONE CASTING RUBBERS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-5130 A/B Page 2 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
INHIBITION:
Certain materials will cause inhibition or neutralization of the curing agent. These materials include condensation/tin cured
based silicone, lacquer and enamel coatings, polyester-based products, copper or copper containing metals, some SLA 3D
Printing resins, and natural rubbers like latex. Inhibition may easily be determined by brushing a small quantity of TC-5130
A/B over a localized area of the surface to be reproduced. If the TC-5130 A/B is tacky or uncured after the cure time, then you
know the mold surface is acting as an inhibitor. To insure against possible problems, it is advisable to spray a barrier film over
any questionable surfaces. This is the best way of treating clays and other surfaces that cause inhibition. Contact BJB for
recommended products.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 12 months from date of
shipment when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Pint Kits 1 lb. 1 lb. 48
Quart Kits 2 lbs. 2 lbs. 96
Gallon Kits 8 lbs. 8 lbs. 386
5-Gallon Kits 40 lbs. 40 lbs. 1,930
55-Gallon Drum Kits 440 lbs. 440 lbs. 21,226
SAFETY PRECAUTIONS:
Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged
contact on the skin may cause an allergic reaction. Eye protection is extremely important. Always use approved safety glasses
or goggles when handling this product.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvents only increase contact and dry skin. Seek qualified
medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only
as directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Silicone Handling Guide TC-5130 Part A SDS TC-5130 Part B SDS
by | Sep 27, 2025
TC-5130 A/B Page 1 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-5130 A/B
25 SHORE A TRANSLUCENT SILICONE RUBBER
TC-5130 A/B is a room temperature, addition/platinum curing silicone rubber designed for making molds and parts. Featuring
exceptional tear strength, low viscosity, 1:1 mix ratio, and a quick demold time, this system is user friendly while producing
high quality finished products. When used to make molds, the TC-5130 A/B is translucent enough to see through when casting
into the mold cavity. For making parts, this system is easily pigmented with BJB s 8100 Series Silicone Pigments.
High Tear Strength Medical Simulations
Translucent/Easily Pigmented Props for Movie Special FX
Low Viscosity Flexible Molds
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore A ASTM D 2240-04e1 25 5
Density (g/cc) ASTM D 792-00 1.147
Cubic Inches per Pound N/A 24.12
Color/Appearance Visual Colorless/Translucent
Tensile Strength (psi) ASTM D412-98a(2002)e1 1,000
Tensile Modulus (psi) ASTM D412-98a(2002)e1 295
Elongation (%) ASTM D412-98a(2002)e1 500
Tear Strength (pli) ASTM D 624-00e1 Die B 115
Shrinkage (in/in) linear ASTM D2566 @ 1 depth Nil
Dielectric Constant, 1 MHz ASTM D150-87 3.371
Dissipation Factor, 1 MHz ASTM D150-87 0.0108
*Note: Reported physical properties are based on test specimens cured 24 hours at room temperature.
Shrink test specimens are cured for 7 days at room temperature.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 100 100
Specific Gravity @ 77 F (25 C) 1.138 1.142
Color Colorless Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 6,480 7,570
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 5,430
Work Time, 100g mass @ 77 F (25 C) 30 40 minutes
Gel Time 50 60 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Properties above are typical and not for specifications.
SILICONE CASTING RUBBERS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-5130 A/B Page 2 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
INHIBITION:
Certain materials will cause inhibition or neutralization of the curing agent. These materials include condensation/tin cured
based silicone, lacquer and enamel coatings, polyester-based products, copper or copper containing metals, some SLA 3D
Printing resins, and natural rubbers like latex. Inhibition may easily be determined by brushing a small quantity of TC-5130
A/B over a localized area of the surface to be reproduced. If the TC-5130 A/B is tacky or uncured after the cure time, then you
know the mold surface is acting as an inhibitor. To insure against possible problems, it is advisable to spray a barrier film over
any questionable surfaces. This is the best way of treating clays and other surfaces that cause inhibition. Contact BJB for
recommended products.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 12 months from date of
shipment when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Pint Kits 1 lb. 1 lb. 48
Quart Kits 2 lbs. 2 lbs. 96
Gallon Kits 8 lbs. 8 lbs. 386
5-Gallon Kits 40 lbs. 40 lbs. 1,930
55-Gallon Drum Kits 440 lbs. 440 lbs. 21,226
SAFETY PRECAUTIONS:
Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged
contact on the skin may cause an allergic reaction. Eye protection is extremely important. Always use approved safety glasses
or goggles when handling this product.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvents only increase contact and dry skin. Seek qualified
medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only
as directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Silicone Handling Guide TC-5130 Part A SDS TC-5130 Part B SDS
by | Sep 27, 2025
TC-5130 A/B Page 1 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-5130 A/B
25 SHORE A TRANSLUCENT SILICONE RUBBER
TC-5130 A/B is a room temperature, addition/platinum curing silicone rubber designed for making molds and parts. Featuring
exceptional tear strength, low viscosity, 1:1 mix ratio, and a quick demold time, this system is user friendly while producing
high quality finished products. When used to make molds, the TC-5130 A/B is translucent enough to see through when casting
into the mold cavity. For making parts, this system is easily pigmented with BJB s 8100 Series Silicone Pigments.
High Tear Strength Medical Simulations
Translucent/Easily Pigmented Props for Movie Special FX
Low Viscosity Flexible Molds
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore A ASTM D 2240-04e1 25 5
Density (g/cc) ASTM D 792-00 1.147
Cubic Inches per Pound N/A 24.12
Color/Appearance Visual Colorless/Translucent
Tensile Strength (psi) ASTM D412-98a(2002)e1 1,000
Tensile Modulus (psi) ASTM D412-98a(2002)e1 295
Elongation (%) ASTM D412-98a(2002)e1 500
Tear Strength (pli) ASTM D 624-00e1 Die B 115
Shrinkage (in/in) linear ASTM D2566 @ 1 depth Nil
Dielectric Constant, 1 MHz ASTM D150-87 3.371
Dissipation Factor, 1 MHz ASTM D150-87 0.0108
*Note: Reported physical properties are based on test specimens cured 24 hours at room temperature.
Shrink test specimens are cured for 7 days at room temperature.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 100 100
Specific Gravity @ 77 F (25 C) 1.138 1.142
Color Colorless Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 6,480 7,570
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 5,430
Work Time, 100g mass @ 77 F (25 C) 30 40 minutes
Gel Time 50 60 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Properties above are typical and not for specifications.
SILICONE CASTING RUBBERS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-5130 A/B Page 2 of 2 Date: 03/06/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
INHIBITION:
Certain materials will cause inhibition or neutralization of the curing agent. These materials include condensation/tin cured
based silicone, lacquer and enamel coatings, polyester-based products, copper or copper containing metals, some SLA 3D
Printing resins, and natural rubbers like latex. Inhibition may easily be determined by brushing a small quantity of TC-5130
A/B over a localized area of the surface to be reproduced. If the TC-5130 A/B is tacky or uncured after the cure time, then you
know the mold surface is acting as an inhibitor. To insure against possible problems, it is advisable to spray a barrier film over
any questionable surfaces. This is the best way of treating clays and other surfaces that cause inhibition. Contact BJB for
recommended products.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 12 months from date of
shipment when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Pint Kits 1 lb. 1 lb. 48
Quart Kits 2 lbs. 2 lbs. 96
Gallon Kits 8 lbs. 8 lbs. 386
5-Gallon Kits 40 lbs. 40 lbs. 1,930
55-Gallon Drum Kits 440 lbs. 440 lbs. 21,226
SAFETY PRECAUTIONS:
Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged
contact on the skin may cause an allergic reaction. Eye protection is extremely important. Always use approved safety glasses
or goggles when handling this product.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvents only increase contact and dry skin. Seek qualified
medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only
as directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Silicone Handling Guide TC-5130 Part A SDS TC-5130 Part B SDS
by | Sep 27, 2025
