by | Sep 27, 2025
TC-870 FR A/B Page 1 of 2 Date: 04/20/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-870 FR A/B
RIGID 70 SHORE D POLYURETHANE CASTING SYSTEM
FIRE RETARDANT
TC-870 FR A/B is a RoHS compliant, fire retardant, polyurethane system that produces a tough 70 shore D material. This system
has high impact strength and a remarkable heat deflection temperature for a 70 Shore D fire retardant material. The TC-870 FR
A/B may in some applications be post cured without having to use fixtures.
UL 94V-0 Listed, flammability rating at 0.125
thickness (File# E174527)
High heat resistance
RoHS/REACH compliant High impact
9-10 minute work time
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 70 2
Density (g/cc) ASTM D792-00 1.25
Cubic Inches per Pound N/A 23.1
Color/Appearance Visual Clear Pale Amber
Tensile Strength (psi) ASTM D638-03 3,415
Tensile Modulus (psi) ASTM D638-03 7.34 x 10
4
Elongation (%) ASTM D638-03 20.4
Flexural Strength (psi) ASTM D790-03 3,685
Flexural Modulus (psi) ASTM D790-03 9.34 x 10
4
Shrinkage (in/in) linear 12 x1/2 x1/2 0.0082
Izod Impact, notched (ft-lb/in) ASTM D256-05 2.1
Heat Deflection Temperature @ 66 psi ASTM D648-04 195 F (90.6 C)
Dielectric Constant, 1 MHz ASTM D150-87 4.617
Dissipation Factor, 1 MHz ASTM D150-87 0.046
Note: Reported physical properties are based on test specimens cured at an elevated temperature, 180 F (82 C).
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 52
Mix Ratio by volume 100 50
Specific Gravity @ 77 F (25 C) 1.18 1.24
Color Pale Amber Amber
Viscosity (cps) @ 77 F (25 C) Brookfield 1,800 200
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 1,000
Work Time, 100g mass @ 77 F (25 C) 9 10 minutes
Gel Time 12 13 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Demold Time @ 150 F (65.6 C) 60 minutes
Properties above are typical and not for specifications.
RIGID FILLED & UNFILLED URETHANES
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-870 FR A/B Page 2 of 2 Date: 04/20/2021
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.”
CURE SCHEDULE/HEAT CURING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the
physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do not
exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat
curing process.
NOTE #1:
Important: Shake or re-blend both A and B components separately prior to weighing and combining. It is advisable
whenever possible to evacuate entrapped air prior to casting this system. The use of a de-airing agent can speed up the process.
BJB’s AF-4 antifoam works best as the de-airing agent. In conjunction with these support products BJB offers pigments in a wide
variety of colors and stainless steel mixers called “Jiffy Mixers.” If help is required call BJB for assistance. For additional
information on the use of this product, refer to BJB Guidelines for Handling Polyurethane Products.
NOTE #2:
The natural color of TC-870 FR A/B is clear pale amber. When the cured material is exposed to direct sunlight or strong UV light,
the material will turn to an amber/orange color within approximately 2 hours.
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents,
pigments, mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for
more information.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Quart Kits 2 lbs. 1.04 lbs. 70
Gallon Kits 8 lbs. 4.2 lbs. 282
5-Gallon Kits 40 lbs. 20.8 lbs. 1,405
55-Gallon Drum Kits 400 lbs. 208 lbs. 14,045
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.
WARNING: This product can expose you to chemicals including Toluene diisocyanate and Naphthalene, which are known to the State of
California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
Refer to the Material Safety Data Sheet before using this product.
Handling Guide
by | Sep 27, 2025
TC-870 FR A/B Page 1 of 2 Date: 04/20/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-870 FR A/B
RIGID 70 SHORE D POLYURETHANE CASTING SYSTEM
FIRE RETARDANT
TC-870 FR A/B is a RoHS compliant, fire retardant, polyurethane system that produces a tough 70 shore D material. This system
has high impact strength and a remarkable heat deflection temperature for a 70 Shore D fire retardant material. The TC-870 FR
A/B may in some applications be post cured without having to use fixtures.
UL 94V-0 Listed, flammability rating at 0.125
thickness (File# E174527)
High heat resistance
RoHS/REACH compliant High impact
9-10 minute work time
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 70 2
Density (g/cc) ASTM D792-00 1.25
Cubic Inches per Pound N/A 23.1
Color/Appearance Visual Clear Pale Amber
Tensile Strength (psi) ASTM D638-03 3,415
Tensile Modulus (psi) ASTM D638-03 7.34 x 10
4
Elongation (%) ASTM D638-03 20.4
Flexural Strength (psi) ASTM D790-03 3,685
Flexural Modulus (psi) ASTM D790-03 9.34 x 10
4
Shrinkage (in/in) linear 12 x1/2 x1/2 0.0082
Izod Impact, notched (ft-lb/in) ASTM D256-05 2.1
Heat Deflection Temperature @ 66 psi ASTM D648-04 195 F (90.6 C)
Dielectric Constant, 1 MHz ASTM D150-87 4.617
Dissipation Factor, 1 MHz ASTM D150-87 0.046
Note: Reported physical properties are based on test specimens cured at an elevated temperature, 180 F (82 C).
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 52
Mix Ratio by volume 100 50
Specific Gravity @ 77 F (25 C) 1.18 1.24
Color Pale Amber Amber
Viscosity (cps) @ 77 F (25 C) Brookfield 1,800 200
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 1,000
Work Time, 100g mass @ 77 F (25 C) 9 10 minutes
Gel Time 12 13 minutes
Demold Time @ 77 F (25 C) 3 4 hours
Demold Time @ 150 F (65.6 C) 60 minutes
Properties above are typical and not for specifications.
RIGID FILLED & UNFILLED URETHANES
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-870 FR A/B Page 2 of 2 Date: 04/20/2021
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.”
CURE SCHEDULE/HEAT CURING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the
physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do not
exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat
curing process.
NOTE #1:
Important: Shake or re-blend both A and B components separately prior to weighing and combining. It is advisable
whenever possible to evacuate entrapped air prior to casting this system. The use of a de-airing agent can speed up the process.
BJB’s AF-4 antifoam works best as the de-airing agent. In conjunction with these support products BJB offers pigments in a wide
variety of colors and stainless steel mixers called “Jiffy Mixers.” If help is required call BJB for assistance. For additional
information on the use of this product, refer to BJB Guidelines for Handling Polyurethane Products.
NOTE #2:
The natural color of TC-870 FR A/B is clear pale amber. When the cured material is exposed to direct sunlight or strong UV light,
the material will turn to an amber/orange color within approximately 2 hours.
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents,
pigments, mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for
more information.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Quart Kits 2 lbs. 1.04 lbs. 70
Gallon Kits 8 lbs. 4.2 lbs. 282
5-Gallon Kits 40 lbs. 20.8 lbs. 1,405
55-Gallon Drum Kits 400 lbs. 208 lbs. 14,045
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.
WARNING: This product can expose you to chemicals including Toluene diisocyanate and Naphthalene, which are known to the State of
California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
Refer to the Material Safety Data Sheet before using this product.
Handling Guide
by | Sep 27, 2025
TC-865 A/B Page 1 of 2 Date: 02/07/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-865 A/B
65 SHORE D POLYURETHANE CASTING SYSTEM
TC-865 A/B is a medium viscosity, economical and easy to handle two component urethane compound. This system cures relatively
fast at room temperature producing tough, impact resistant castings.
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 65 2
Density (g/cc) ASTM D792 1.15
Cubic Inches per Pound N/A 24
Color/Appearance Visual Cream / Opaque
Tensile Strength (psi) ASTM D412 2,475
Tensile Modulus (psi) ASTM D412 99,000
Elongation (%) ASTM D412 70
Flexural Strength (psi) ASTM D790 2,875
Flexural Modulus (psi) ASTM D790 92,850
Tear Strength (pli) ASTM D624 585
Shrinkage (in/in) linear 12 x1/2 x1/2 0.005
Izod Impact (ft-lb/in) notched ASTM D256 0.85
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 100 95
Specific Gravity @ 77 F (25 C) 1.13 1.18
Color Pale Yellow Cream
Viscosity (cps) @ 77 F (25 C) Brookfield 1,350 1,500
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 1,400
Work Time, 100g mass @ 77 F (25 C) 9 11 minutes
Gel Time 12 15 minutes
Demold Time @ 77 F (25 C) 2 3 hours
Properties above are typical and not for specifications.
SHORE D SEMI-RIGID URETHANES
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-865 A/B Page 2 of 2 Date: 02/07/2022
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.”
CURE SCHEDULE/HEAT CURING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the physical
properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do not exceed
curing temperature of 200 F (93 C).
PIGMENTING:
TC-865 A/B naturally produces light cream colored parts, but may be easily tinted to any color from light pastels to deep tones using
BJB’s 6800 Series pigments. The 6800 Series pigments are dispersions which can be used to a maximum of 2% to the total weight of
the TC-865 A/B. Dry pigments, such as fluorescent colors, may also be used. Recommended levels of dry pigments are 5 – 10% to
the total weight of the TC-865 A/B system.
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents, pigments,
mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for more
information.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Gallon Kits 8 lbs. 8 lbs. 384
5-Gallon Kits 40 lbs. 40 lbs. 1,920
55-Gallon Drum Kits 400 lbs. 400 lbs. 19,200
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.
WARNING: This product can expose you to chemicals including N-Methylpyrrolidone and Naphthalene, which are known to
the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to
www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-854 A/B Page 1 of 2 Date: 07/03/2023
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-854 A/B
RIGID 84 SHORE D POLYURETHANE CASTING SYSTEM
TC-854 is an extremely stiff, high impact, translucent material making it ideal when exact color matching is required. When
coupled with the low viscosity, low shrink and high heat deflection temperature, this material is always a popular choice for a
wide variety of applications.
RoHS/REACH compliant Odorless, Translucent
High impact strength Low viscosity
High heat distortion temperature Excellent for hand, vacuum, or pressure casting
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 84 2
Density (g/cc) ASTM D792-00 1.20
Cubic Inches per Pound N/A 24.5
Color/Appearance Visual Transparent Pale Yellow
Tensile Strength (psi) ASTM D638-03 10,060
Tensile Modulus (psi) ASTM D638-03 3.3 x 10
5
Elongation (%) ASTM D638-03 10.5
Flexural Strength (psi) ASTM D790-03 13,700
Flexural Modulus (psi) ASTM D790-03 3.6 x 10
5
Shrinkage (in/in) linear 12 x1/2 x1/2 0.001
Izod Impact, notched (ft-lb/in) ASTM D256-05 1.14
Heat Deflection Temperature @ 66 psi ASTM D648-04 190 5 F (88 3 C)
Heat Deflection Temperature @ 264 psi ASTM D648-04 170 5 F (77 3 C)
*Note: Reported physical properties are based on test specimens cured 1-3 hours at room temperature then 16 hours at 180 F (82 C).
Shrink test specimens are cured for 24 hours at room temperature and then 16 hours at 180 F (82 C).
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 60
Mix Ratio by volume 100 66
Specific Gravity @ 77 F (25 C) 1.17 1.07
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 165 725
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 450
Work Time, 100g mass @ 77 F (25 C) 6 8 minutes
Gel Time 7 9 minutes
Demold Time @ 77 F (25 C) 2 3 hours
Properties above are typical and not for specifications.
TC-854 A/B Page 2 of 2 Date: 07/03/2023
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.”
CURE SCHEDULE/HEAT CURING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the physical
properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do not exceed curing
temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat curing process.
MIXING NOTE:
Preconditioning the A and B components to approximately 80 -100 F (27 -38 C) prior to mixing is desirable for best results.
Evacuation of the mixed components is recommended in order to achieve the best results. The use of a de-airing agent, (BJB s AF-
4), can speed the process.
HANDLING NOTE:
Material contains a small amount of moisture scavenger that will settle to the bottom of the container. At moderate levels, the scavenger
has little effect on the cured properties. BJB suggests doing one of the following:
A. Mix material prior to every use to uniformly redistribute the scavenger OR-
B. Allow moisture scavenger to settle at the bottom of container without remixing. (A layer of residual moisture scavenger should
remain in the container when finished.)
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents, pigments,
mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for more information.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 months from date of shipment when
properly stored at recommended temperatures.
PACKAGING Part A Part B Cubic Inches per Kit
Quart Kits 2 lbs. 1.2 lbs. 78
Gallon Kits 8 lbs. 4.8 lbs. 314
5-Gallon Kits 40 lbs. 24 lbs. 1,568
55-Gallon Drum Kits 400 lbs. 240 lbs. 15,680
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.
WARNING: This product can expose you to chemicals including Ethylbenzene, which are known to the State of California to
cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-854 A/B Page 1 of 2 Date: 07/03/2023
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-854 A/B
RIGID 84 SHORE D POLYURETHANE CASTING SYSTEM
TC-854 is an extremely stiff, high impact, translucent material making it ideal when exact color matching is required. When
coupled with the low viscosity, low shrink and high heat deflection temperature, this material is always a popular choice for a
wide variety of applications.
RoHS/REACH compliant Odorless, Translucent
High impact strength Low viscosity
High heat distortion temperature Excellent for hand, vacuum, or pressure casting
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 84 2
Density (g/cc) ASTM D792-00 1.20
Cubic Inches per Pound N/A 24.5
Color/Appearance Visual Transparent Pale Yellow
Tensile Strength (psi) ASTM D638-03 10,060
Tensile Modulus (psi) ASTM D638-03 3.3 x 10
5
Elongation (%) ASTM D638-03 10.5
Flexural Strength (psi) ASTM D790-03 13,700
Flexural Modulus (psi) ASTM D790-03 3.6 x 10
5
Shrinkage (in/in) linear 12 x1/2 x1/2 0.001
Izod Impact, notched (ft-lb/in) ASTM D256-05 1.14
Heat Deflection Temperature @ 66 psi ASTM D648-04 190 5 F (88 3 C)
Heat Deflection Temperature @ 264 psi ASTM D648-04 170 5 F (77 3 C)
*Note: Reported physical properties are based on test specimens cured 1-3 hours at room temperature then 16 hours at 180 F (82 C).
Shrink test specimens are cured for 24 hours at room temperature and then 16 hours at 180 F (82 C).
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 60
Mix Ratio by volume 100 66
Specific Gravity @ 77 F (25 C) 1.17 1.07
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 165 725
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 450
Work Time, 100g mass @ 77 F (25 C) 6 8 minutes
Gel Time 7 9 minutes
Demold Time @ 77 F (25 C) 2 3 hours
Properties above are typical and not for specifications.
TC-854 A/B Page 2 of 2 Date: 07/03/2023
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.”
CURE SCHEDULE/HEAT CURING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the physical
properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do not exceed curing
temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat curing process.
MIXING NOTE:
Preconditioning the A and B components to approximately 80 -100 F (27 -38 C) prior to mixing is desirable for best results.
Evacuation of the mixed components is recommended in order to achieve the best results. The use of a de-airing agent, (BJB s AF-
4), can speed the process.
HANDLING NOTE:
Material contains a small amount of moisture scavenger that will settle to the bottom of the container. At moderate levels, the scavenger
has little effect on the cured properties. BJB suggests doing one of the following:
A. Mix material prior to every use to uniformly redistribute the scavenger OR-
B. Allow moisture scavenger to settle at the bottom of container without remixing. (A layer of residual moisture scavenger should
remain in the container when finished.)
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents, pigments,
mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for more information.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 months from date of shipment when
properly stored at recommended temperatures.
PACKAGING Part A Part B Cubic Inches per Kit
Quart Kits 2 lbs. 1.2 lbs. 78
Gallon Kits 8 lbs. 4.8 lbs. 314
5-Gallon Kits 40 lbs. 24 lbs. 1,568
55-Gallon Drum Kits 400 lbs. 240 lbs. 15,680
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.
WARNING: This product can expose you to chemicals including Ethylbenzene, which are known to the State of California to
cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-852 A/B Page 1 of 2 Date: 09/06/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-852 A/B
78 SHORE D POLYURETHANE CASTING SYSTEM
TC-852 A/B produces a high impact, rigid 78 Shore D material that is commonly used to make computer housings, models of all
kinds, artwork, and can also be used for electronic component encapsulation. TC-852 A/B is an excellent hand-castable product
that produces parts with heat deflection temperatures up to 220 F (104 C).
Non-mercury based catalyst system RoHS compliant
High impact rigid material Odorless, clean white color
1 2 hour demold time Excellent for vacuum or pressure casting
Low viscosity Exhibits exceptional high heat distortion temperature
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 78 2
Density (g/cc) ASTM D792 1.15
Cubic Inches per Pound N/A 25.2
Color/Appearance Visual Off White/Opaque
Tensile Strength (psi) ASTM D638 7,000
Tensile Modulus (psi) ASTM D638 2.4 x 10
5
Elongation (%) ASTM D638 12
Flexural Strength (psi) ASTM D790 10,500
Flexural Modulus (psi) ASTM D790 2.7 x 10
5
Shrinkage (in/in) linear 12 x x 0.004
Izod Impact, notched (ft-lb/in) ASTM D256 0.7
Heat Deflection Temperature @ 66psi ASTM D648 220 5 F (104.4 3 C)
Heat Deflection Temperature @ 264psi ASTM D648 200 5 F (93.3 3 C)
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 50
Mix Ratio (by volume) 100 53
Specific Gravity @77 F (25 C) 1.12 1.05
Color Yellow Colorless
Viscosity (cps) @77 F (25 C) Brookfield 70 1,450
Mixed Viscosity (cps) @77 F (25 C) Brookfield 250
Work Time, 100g mass @ 77 F (25 C) 4.5 minutes
Gel Time 5 minutes
Demold Time @ 77 F (25 C) 1 2 hours
Properties above are typical and not for specifications.
TC-852 A/B Page 2 of 2 Date: 09/06/2021
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.”
CURE SCHEDULE/HEAT CURING :
Most of the physical properties can be achieved in 5-7 days at ambient temperature, 77 F (25 C). In order to achieve maximum
physical properties, a post cure with heat is recommended. BJB recommends 24 hours at ambient temperature, 77 F (25 C),
followed by 16 hours at 180 F (82 C). Support of the part may be required to prevent part deformation during heat cure.
NOTE:
TC-852 A/B with its non-mercury catalyst system does exhibit greater sensitivity to moisture than do similar products that use
mercury-containing catalysts. TC-852 A/B should be stored at ambient temperature and the TC-852 B component may
require vacuum de-airing prior to combining it with the A component. Evacuation of the mixed components is mandatory in
order to achieve best results. If further information is required, please contact BJB s technical staff for assistance.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Gallon Kits 8 lbs. 4 lbs. 302
5-Gallon Kits 40 lbs. 20 lbs. 1,512
55-Gallon Drum Kits 400 lbs. 200 lbs. 15,120
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.
WARNING: This product can expose you to chemicals including 1,2-Benzenedicarboxylic,di-C9-11-branched alkyl
esters, C10-rich and Naphthalene, which are known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-852 A/B Page 1 of 2 Date: 09/06/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-852 A/B
78 SHORE D POLYURETHANE CASTING SYSTEM
TC-852 A/B produces a high impact, rigid 78 Shore D material that is commonly used to make computer housings, models of all
kinds, artwork, and can also be used for electronic component encapsulation. TC-852 A/B is an excellent hand-castable product
that produces parts with heat deflection temperatures up to 220 F (104 C).
Non-mercury based catalyst system RoHS compliant
High impact rigid material Odorless, clean white color
1 2 hour demold time Excellent for vacuum or pressure casting
Low viscosity Exhibits exceptional high heat distortion temperature
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 78 2
Density (g/cc) ASTM D792 1.15
Cubic Inches per Pound N/A 25.2
Color/Appearance Visual Off White/Opaque
Tensile Strength (psi) ASTM D638 7,000
Tensile Modulus (psi) ASTM D638 2.4 x 10
5
Elongation (%) ASTM D638 12
Flexural Strength (psi) ASTM D790 10,500
Flexural Modulus (psi) ASTM D790 2.7 x 10
5
Shrinkage (in/in) linear 12 x x 0.004
Izod Impact, notched (ft-lb/in) ASTM D256 0.7
Heat Deflection Temperature @ 66psi ASTM D648 220 5 F (104.4 3 C)
Heat Deflection Temperature @ 264psi ASTM D648 200 5 F (93.3 3 C)
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 50
Mix Ratio (by volume) 100 53
Specific Gravity @77 F (25 C) 1.12 1.05
Color Yellow Colorless
Viscosity (cps) @77 F (25 C) Brookfield 70 1,450
Mixed Viscosity (cps) @77 F (25 C) Brookfield 250
Work Time, 100g mass @ 77 F (25 C) 4.5 minutes
Gel Time 5 minutes
Demold Time @ 77 F (25 C) 1 2 hours
Properties above are typical and not for specifications.
TC-852 A/B Page 2 of 2 Date: 09/06/2021
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.”
CURE SCHEDULE/HEAT CURING :
Most of the physical properties can be achieved in 5-7 days at ambient temperature, 77 F (25 C). In order to achieve maximum
physical properties, a post cure with heat is recommended. BJB recommends 24 hours at ambient temperature, 77 F (25 C),
followed by 16 hours at 180 F (82 C). Support of the part may be required to prevent part deformation during heat cure.
NOTE:
TC-852 A/B with its non-mercury catalyst system does exhibit greater sensitivity to moisture than do similar products that use
mercury-containing catalysts. TC-852 A/B should be stored at ambient temperature and the TC-852 B component may
require vacuum de-airing prior to combining it with the A component. Evacuation of the mixed components is mandatory in
order to achieve best results. If further information is required, please contact BJB s technical staff for assistance.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Gallon Kits 8 lbs. 4 lbs. 302
5-Gallon Kits 40 lbs. 20 lbs. 1,512
55-Gallon Drum Kits 400 lbs. 200 lbs. 15,120
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.
WARNING: This product can expose you to chemicals including 1,2-Benzenedicarboxylic,di-C9-11-branched alkyl
esters, C10-rich and Naphthalene, which are known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-851 A/B Page 1 of 2 Date: 03/12/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-851 A/B
78 SHORE D POLYURETHANE CASTING SYSTEM
TC-851 A/B produces a high impact rigid 78 Shore D material that is commonly used to make computer housings, models of all
kinds, artwork, and can also be used for electronic component encapsulation. It provides a working time of 6-7 minutes.
Low viscosity RoHS/REACH compliant
High impact rigid material Odorless, clean white color
1-2 hour demold time Excellent for vacuum or pressure casting
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 78 2
Density (g/cc) ASTM D792 1.13
Cubic Inches per Pound N/A 25.2
Color/Appearance Visual White/Opaque
Tensile Strength (psi) ASTM D638 7,200
Tensile Modulus (psi) ASTM D638 2.1 x 10
5
Elongation (%) ASTM D638 8
Flexural Strength (psi) ASTM D790 10,300
Flexural Modulus (psi) ASTM D790 2.6 x 10
5
Shrinkage (in/in) linear 12 x x 0.005
Izod Impact, notched (ft-lb/in) ASTM D256 0.65
Heat Deflection Temperature @ 66psi ASTM D648 210 5 F (98.9 3 C)
Heat Deflection Temperature @ 264psi ASTM D648 195 5 F (90.6 3 C)
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 50
Mix Ratio (by volume) 100 51
Specific Gravity @ 77 F (25 C) 1.1 1.07
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 75 1,400
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 400
Work Time, 100g mass @ 77 F (25 C) 6 7 minutes
Gel Time 7 8 minutes
Demold Time @ 77 F (25 C) 1 2 hours
Properties above are typical and not for specifications.
TC-851 A/B Page 2 of 2 Date: 03/12/2021
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.”
CURE SCHEDULE/HEAT CURING :
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the
physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 160 F (71 C). Do
not exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat
curing process.
NOTE:
TC-851 A/B with its non-mercury catalyst system does exhibit greater sensitivity to moisture than do similar products that use
mercury-containing catalysts. TC-851 A/B should be stored at ambient temperature and the TC-851 B component may
require vacuum de-airing prior to combining it with the A component. Evacuation of the mixed components is mandatory in
order to achieve best results. If further information is required, please contact BJB s technical staff for assistance.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Quart Kits 2 lbs. 1 lb. 76
Gallon Kits 8 lbs. 4 lbs. 302
5-Gallon Kits 40 lbs. 20 lbs. 1,512
55-Gallon Drum Kits 400 lbs. 200 lbs. 15,120
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.
WARNING: This product can expose you to chemicals including 1,2-Benzenedicarboxylic acid, di-C9-11-branched alkyl
esters, C10-rich, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For
more information, go to www.P65Warnings.ca.gov.
Handling Guide
by | Sep 27, 2025
TC-850 A/B Page 1 of 2 Date: 01/25/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-850 A/B
75 SHORE D POLYURETHANE CASTING SYSTEM
TC-850 A/B produces a high impact rigid 75 Shore D material that is commonly used to make computer housings, models
of all kinds, artwork, and can also be used for electronic component encapsulation. It provides a working time of 6-7
minutes.
RoHS/REACH Compliant 1-2 hour demold time
High impact rigid material Excellent for vacuum or pressure casting
Odorless, clean white Low viscosity
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 75 2
Density (g/cc) ASTM D792 1.12
Cubic Inches per Pound N/A 25.6
Color/Appearance Visual White/Opaque
Tensile Strength (psi) ASTM D638 6,800
Tensile Modulus (psi) ASTM D638 2.1 x 10
5
Elongation (%) ASTM D638 10
Flexural Strength (psi) ASTM D790 9,800
Flexural Modulus (psi) ASTM D790 2.42 x 10
5
Shrinkage (in/in) linear 12 x x 0.006
Izod Impact, notched (ft-lb/in) ASTM D256 0.66
Heat Deflection Temperature @ 66 psi ASTM D648 203 F (95 C)
Heat Deflection Temperature @ 264 psi ASTM D648 193 F (89.4 C)
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 50
Mix Ratio (by volume) 100 52
Specific Gravity @ 77 F (25 C) 1.10 1.06
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 75 1,350
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 160
Work Time, 100g mass @ 77 F (25 C) 6 7 minutes
Gel Time 7 8 minutes
Demold Time @ 77 F (25 C) 1 2 hours
Properties above are typical and not for specifications.
TC-850 A/B Page 2 of 2 Date: 01/25/2021
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.”
CURE SCHEDULE/HEAT CURING :
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but
the physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 160 F
(71 C). Do not exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part
deformation during the heat curing process.
VACUUM DE-GASSING/DE-AIRING:
It is advisable whenever possible to evacuate entrapped air prior to casting this system. The use of de-airing agent, (BJB s
AF-4), can speed the process.
NOTE:
TC-850 A/B should be stored at ambient temperature and the TC-850 B component may require vacuum de-airing prior
to combining it with the A component. Evacuation of the mixing components is mandatory in order to achieve best
results. It is recommended that the A & B components as well as the mold should be pre-conditioned to a minimum of
80 F (26.7 C) prior to use. If further information is required, please contact BJB s technical staff for assistance.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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
Quart Kits 2 lbs. 1 lb. 77
Gallon kits 8 lbs. 4 lbs. 307
5 Gallon kits 40 lbs. 20 lbs. 1,536
Drum kits 440 lbs. 220 lbs. 16,896
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.
WARNING: This product can expose you to chemicals including 1,2-Benzenedicarboxylic acid, di-C9-11-branched
alkyl esters, C10-rich and Naphthalene, which are known to the State of California to cause cancer and birth defects or
other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Refer to the Material Safety Data Sheet before using this product.
Handling Guide
by | Sep 27, 2025
TC-821 A/B Page 1 of 2 Date: 09/20/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-821 A/B
84 SHORE D POLYURETHANE CASTING SYSTEM
TC-821 A/B produces a high impact rigid 84 Shore D material that is commonly used to make computer housings, models of all
kinds, artwork, and can also be used for electronic component encapsulation.
Convenient 1:1 by volume ratio High impact rigid material
High impact rigid material Fast demolds
Excellent for vacuum, pressure, hand, and rotational
casting
Exhibits high heat distortion temperature
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 84 2
Density (g/cc) ASTM D792-00 1.18
Cubic Inches per Pound N/A 24.7
Color/Appearance Visual Translucent/Colorless
Tensile Strength (psi) ASTM D638-03 7,600
Tensile Modulus (psi) ASTM D638-03 2.4 x 10
5
Elongation (%) ASTM D638-03 11.5
Flexural Strength (psi) ASTM D790-03 11,500
Flexural Modulus (psi) ASTM D790-03 3 x 10
5
Shrinkage (in/in) linear 12 x x 0.005
Izod Impact, notched (ft-lb/in) ASTM D256-05 0.75
Heat Deflection Temperature @ 66psi ASTM D648-04 195 F (90.6 C)
Heat Deflection Temperature @ 264psi ASTM D648-04 170 F (76.7 C)
Dielectric Constant, 1MHz ASTM D150-87 3.06
Dissipation Factor, 1 MHz ASTM D150-87 0.019
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight ) 100 90
Mix Ratio (by volume) 100 100
Specific Gravity @ 77 F (25 C) 1.19 1.06
Color Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 60 2,300
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 1,200
Work Time, 100g mass @ 77 F (25 C) 2 minutes
Demold Time @ 77 F (25 C) 30 60 minutes
Properties above are typical and not for specifications.
TC-821 A/B Page 2 of 2 Date: 09/20/2021
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.”
CURE SCHEDULE/HEAT CURING :
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the
physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do
not exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the heat
curing process.
NOTE:
Re-blend the B component thoroughly prior to use. It is advisable to evacuate entrapped air prior to casting this system. The
use of a de-airing agent, (BJB s AF-4), can speed up the process. If further information is required, please contact BJB s
technical staff for assistance.
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents,
pigments, mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for
more information.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 months from date of shipment
when properly stored at recommended temperatures.
PACKAGING Part A Part B
Cubic Inches
per Kit
Quart Kits 2 lbs. 1.8 lbs. 94
Gallon Kits 8 lbs. 7.2 lbs. 375
5-Gallon Kits 40 lbs. 36 lbs. 1,877
55-Gallon Drum Kits 400 lbs. 360 lbs. 18,772
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.
WARNING: This product can expose you to chemicals including 1,2-Benzenedicarboxylic acid, di-C9-11-branched alkyl
esters, C10-rich and Naphthalene, which are known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Handling Guide
