by | Sep 27, 2025
TC-802 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
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-802 A/B
73 SHORE D POLYURETHANE CASTING SYSTEM
TC-802 A/B is an easy to use rigid urethane casting material. TC-802 A/B is an extremely low viscosity system with
quick demold times. This system also exhibits good physical and heat capabilities. In addition, this system is
economically priced. The one-to-one volume ratio makes it perfect for use with dispensing equipment. TC-802 A/B is a
great product when ABS-type parts with a quick turnaround are required.
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240-04e1 73 2
Density (g/cc) ASTM D792-00 1.06
Cubic Inches per Pound N/A 26.5
Color/Appearance Visual White/Opaque
Tensile Strength (psi) ASTM D638-03 4,180
Tensile Modulus (psi) ASTM D638-03 1.32 x 10
5
Elongation (%) ASTM D638-03 40
Flexural Strength (psi) ASTM D790-03 5,975
Flexural Modulus (psi) ASTM D790-03 1.48 x 10
5
Shrinkage (in/in) linear 12 x x 0.006
Izod Impact, notched (ft-lb/in) ASTM D256-05 0.42
Heat Deflection Temperature @ 66 psi ASTM D648-04 177 F (80.6 C)
Heat Deflection Temperature @ 264 psi ASTM D648-04 147 F (63.9 C)
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) 1.10 0.99
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 40 120
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 80
Work Time, 100g mass @ 77 F (25 C) 1.5 minutes
Demold Time @ 77 F (25 C) 10 minutes
Properties above are typical and not for specifications.
TC-802 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.
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. 1.8 lbs. 101
Gallon Kits 8 lbs. 7.2 lbs. 403
5-Gallon Kits 40 lbs. 36 lbs. 2,014
55-Drum Kits 400 lbs. 360 lbs. 20,140
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.
Handling Guide
by | Sep 27, 2025
TC-800 A/B Page 1 of 2 Date: 06/28/2021
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-800 A/B
RIGID 75 SHORE D POLYURETHANE
CASTING SYSTEM
TC-800 A/B is an easy to use rigid urethane casting material. TC-800 A/B exhibits excellent physical properties, very low
viscosity, high heat capability and quick demold times. In addition, this system is economically priced. The one-to-one volume
ratio makes it perfect for use with dispensing equipment. TC-800 A/B is a great product when ABS-type parts with a quick
turnaround are required. Features a non-mercury based catalyst system.
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240 75 2
Density (g/cc) ASTM D792 1.11
Cubic Inches per Pound N/A 25.7
Color/Appearance Visual White/Opaque
Tensile Strength (psi) ASTM D638 6,100
Tensile Modulus (psi) ASTM D638 1.9 x 10
5
Elongation (%) ASTM D638 8
Flexural Strength (psi) ASTM D790 9,250
Flexural Modulus (psi) ASTM D790 2.3 x 10
5
Shrinkage (in/in) linear 12 x x 0.007
Izod Impact, notched (ft-lb/in) ASTM D256 0.5
Heat Deflection Temperature @ 66 psi ASTM D648 185 5 F (85 3 C)
Heat Deflection Temperature @ 264 psi ASTM D648 160 5 F (71 3 C)
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 88
Mix Ratio (by volume) 100 100
Specific Gravity @ 77 F (25 C) 1.15 1.01
Color Pale Yellow Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 60 375
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 200
Work Time, 100g mass @ 77 F (25 C) 2 minutes
Demold Time @ 77 F (25 C) 60 minutes
Properties above are typical and not for specifications.
TC-800 A/B Page 2 of 2 Date: 06/28/2021
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.
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. 1.8 lbs. 98
Gallon Kits 8 lbs. 7.1 lbs. 388
5-Gallon Kits 40 lbs. 35.2 lbs. 1,933
Drum Kits 400 lbs. 352 lbs. 19,326
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 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-680 A/B Page 1 of 2 Date: 06/10/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-680 A/B
80 SHORE A POLYURETHANE ELASTOMER
TC-680 A/B is a two-component polyurethane elastomer compound specifically designed for casting applications. This product is a
safe, easy-to-handle, room temperature mixing and curing system that contains no TDI, MDA, or MOCA. The low shrinkage,
superior toughness, and excellent detail reproduction of TC-680 A/B makes this system ideal for general purpose castings and quality
tooling operations.
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore A ASTM D2240 80 5
Density (g/cc) ASTM D792 1.04
Cubic Inches per Pound N/A 25.9
Color/Appearance Visual Pale Green/Clear
Tensile Strength (psi) ASTM D412 1,475
Tensile Modulus (psi) ASTM D412 4,380
Elongation (%) ASTM D412 715
Tear Strength (pli) ASTM D624 225
Shrinkage (in/in) linear 12 x x 0.006
Water Immersion (%) 24-hour weight gain N/A 3.7
Insulation Resistance (ohms) ASTM D257 3 x 10
12
Surface Resistivity (ohm-cm) ASTM D257 5 x 10
15
Dielectric Constant, 10
3
Hz ASTM D150 3.9
Dissipation Factor, 10
3
Hz ASTM D150 0.01
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 50
Mix Ratio by volume 100 49
Specific Gravity @ 77 F (25 C) 1.06 1.09
Color Colorless Amber
Viscosity (cps) @ 77 F (25 C) Brookfield 6,000 60
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 2,100
Work Time, 100g mass @ 77 F (25 C) 20 minutes
Gel Time 25 minutes
Demold Time @ 77 F (25 C) 4 6 hours
Properties above are typical and not for specifications.
ALIPHATIC & WATER CLEAR URETHANES
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-680 A/B Page 2 of 2 Date: 06/10/2021
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). Do not
exceed curing temperatures of 200 F (93 C).
NOTE:
The cure will be inhibited if cast against a tin catalyzed silicone RTV.
STORAGE AND HANDLING:
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. 78
Gallon Kits 8 lbs. 4 lbs. 311
5-Gallon Kits 40 lbs. 20 lbs. 1,554
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 Butyl benzyl phthalate and Phenyl mercury neodecanoate,
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
by | Sep 27, 2025
by | Sep 27, 2025
by | Sep 27, 2025
TC-284 A/B Page 1 of 2 Date: 06/20/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-284 A/B
8-13 LB. VARIABLE RATIO, SELF-SKINNING
FLEXIBLE FOAM
TC-284 A/B is a two-component, self-skinning, flexible polyurethane foam. The cured material feels similar to an auto arm rest pad.
BJB s 6800 Series Pigments may be added to the B side for developing a wide range of colors. End users can adjust firmness with a
slight ratio change as listed below. Common applications are prototypes, bumper/crash pads, arm rests, movie special effects props and
more. Skin thickness is controlled by material/ mold temperature, and the loading of the mold.
Note: TC-284 at a ratio of 50/100 is a firm, 8 lb. density foam. At 30/100 ratio, the result will be a softer feel but the density increases
to 13 lbs. per cubic foot.
HANDLING PROPERTIES
8# DENSITY
For a Firm Feel
13# DENSITY
For a Softer yet Denser Foam
Mix Ratio (by weight)
50 parts A
100 parts B
30 Parts A
100 Parts B
Density, (free rise) lbs/ft
3
8 13
Density, (free rise) kg/m
3
128 208
Cream Time @ 77 F (25 C) 20 25 seconds 25 30 seconds
Rise Time 2 2.25 minutes 2 minutes
Demold Time @ 77 F (25 C) 30 minutes 30 minutes
Part A Part B
Specific Gravity @ 77 F (25 C) 1.15 1.04
Color Amber Off-white
Viscosity (cps) @ 77 F (25 C) Brookfield 425 1,915
*The density and processing times listed are derived from a statistical average of long-term testing. We recommend a test mix be
performed before use.
MIXING:
Mixing is best with a high speed drill or air motor with a Jiffy
Mixer . The blade shears the material and provides a thorough mix
within the 8 to 10 second period generally established for achieving
a uniform blend. Mixing too long or not enough can result in poor
material performance.
Once mixed, the material should be immediately poured. If too
much time goes by, the foam will rise in the mix container and the
batch may be lost.
When pouring the foam, avoid trying to scrape any material from
the container sidewalls or bottom. Generally, there isn t enough
time to do this and more importantly there may be material that is
not well mixed on the container sides.
POLYURETHANE FOAM SYSTEMS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-284 A/B Page 2 of 2 Date: 06/20/2022
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.”
MOLD PREPARATIONS:
The mold should be well sealed and released. Foams will seek moisture through release waxes and stick to mold surfaces if an
insufficient seal exists. Sealing can be accomplished by using acrylic or other similar sealers. The mold should be warmed to between
75- 85 F (24-29 C) prior to casting the first part. Once a mold is heated and cycled it will maintain heat for continued production.
Release systems vary in accordance to the type of mold used; however, as a general product we recommend Challenge 95 Release or a
mold release paste wax from our line of products. As a rule, silicone based releases do not work with either the flexible or rigid foam
groups of materials. The silicone migrates and often causes poor surface conditions. Silicone will also inhibit the adhesion of paints and
over-coatings. The best molds for production (rather than prototype or limited production parts) are either machined aluminum molds or
epoxy molds. Epoxy molds offer the least expensive method for long term use when cycle times allow slower heat dissipation.
DEMOLDING FOAM MATERIALS:
TC-284 A/B can be removed from the mold within a 30-minute timeframe. However, smaller masses will develop lower exothermic
reaction and may require a slightly longer cure time. It is recommended that foam parts be crushed or squeezed after demolding to
remove residual gases remaining in the cell structure. This will help to reduce post shrinkage and aid in reducing natural odors from the
foam part.
NOTE:
The B component should be gently shaken or stirred to re-blend prior to mixing with part A .
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.
When first using the material, a sample should be visually inspected to be sure no crystallization is present. Crystallization of either the resin or
hardener can occur during shipment in cold weather. If the resin appears cloudy or the hardener becomes gummy, the component should be
warmed with the containers open and stirred until the material returns to its proper smooth liquid consistency.
PACKAGING Part A Part B
8-Pound Density
Free Rise*
Cubic Inches per Kit
16-Pound Density
Double Load*
Cubic Inches per Kit
Quart Kits 1 lbs. 2 lbs. 648 324
Gallon Kits 4 lbs. 8 lbs. 2,592 1,296
5-Gallon Kits 20 lbs. 40 lbs. 12,960 6,480
55-Gallon Drum Kits 225 lbs. 450 lbs. 148,800 72,900
*NOTE:
Free Rise means a foam is poured into an open mold, no top. A cubic foot of a 3-pound density will weigh 3 pounds. Double
Loading, a good starting point for closed molds is to double the amount of material used in its free rise state, this helps to capture the
parts detail and create a more resilient skin. Our cured samples represent double loading.
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 Diethanolamine and Ethylene glycol, 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.
Scan QR code to see our How-to Foam
Video
by | Sep 27, 2025
by | Sep 27, 2025
TC-284 A/B Page 1 of 2 Date: 06/20/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-284 A/B
8-13 LB. VARIABLE RATIO, SELF-SKINNING
FLEXIBLE FOAM
TC-284 A/B is a two-component, self-skinning, flexible polyurethane foam. The cured material feels similar to an auto arm rest pad.
BJB s 6800 Series Pigments may be added to the B side for developing a wide range of colors. End users can adjust firmness with a
slight ratio change as listed below. Common applications are prototypes, bumper/crash pads, arm rests, movie special effects props and
more. Skin thickness is controlled by material/ mold temperature, and the loading of the mold.
Note: TC-284 at a ratio of 50/100 is a firm, 8 lb. density foam. At 30/100 ratio, the result will be a softer feel but the density increases
to 13 lbs. per cubic foot.
HANDLING PROPERTIES
8# DENSITY
For a Firm Feel
13# DENSITY
For a Softer yet Denser Foam
Mix Ratio (by weight)
50 parts A
100 parts B
30 Parts A
100 Parts B
Density, (free rise) lbs/ft
3
8 13
Density, (free rise) kg/m
3
128 208
Cream Time @ 77 F (25 C) 20 25 seconds 25 30 seconds
Rise Time 2 2.25 minutes 2 minutes
Demold Time @ 77 F (25 C) 30 minutes 30 minutes
Part A Part B
Specific Gravity @ 77 F (25 C) 1.15 1.04
Color Amber Off-white
Viscosity (cps) @ 77 F (25 C) Brookfield 425 1,915
*The density and processing times listed are derived from a statistical average of long-term testing. We recommend a test mix be
performed before use.
MIXING:
Mixing is best with a high speed drill or air motor with a Jiffy
Mixer . The blade shears the material and provides a thorough mix
within the 8 to 10 second period generally established for achieving
a uniform blend. Mixing too long or not enough can result in poor
material performance.
Once mixed, the material should be immediately poured. If too
much time goes by, the foam will rise in the mix container and the
batch may be lost.
When pouring the foam, avoid trying to scrape any material from
the container sidewalls or bottom. Generally, there isn t enough
time to do this and more importantly there may be material that is
not well mixed on the container sides.
POLYURETHANE FOAM SYSTEMS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-284 A/B Page 2 of 2 Date: 06/20/2022
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.”
MOLD PREPARATIONS:
The mold should be well sealed and released. Foams will seek moisture through release waxes and stick to mold surfaces if an
insufficient seal exists. Sealing can be accomplished by using acrylic or other similar sealers. The mold should be warmed to between
75- 85 F (24-29 C) prior to casting the first part. Once a mold is heated and cycled it will maintain heat for continued production.
Release systems vary in accordance to the type of mold used; however, as a general product we recommend Challenge 95 Release or a
mold release paste wax from our line of products. As a rule, silicone based releases do not work with either the flexible or rigid foam
groups of materials. The silicone migrates and often causes poor surface conditions. Silicone will also inhibit the adhesion of paints and
over-coatings. The best molds for production (rather than prototype or limited production parts) are either machined aluminum molds or
epoxy molds. Epoxy molds offer the least expensive method for long term use when cycle times allow slower heat dissipation.
DEMOLDING FOAM MATERIALS:
TC-284 A/B can be removed from the mold within a 30-minute timeframe. However, smaller masses will develop lower exothermic
reaction and may require a slightly longer cure time. It is recommended that foam parts be crushed or squeezed after demolding to
remove residual gases remaining in the cell structure. This will help to reduce post shrinkage and aid in reducing natural odors from the
foam part.
NOTE:
The B component should be gently shaken or stirred to re-blend prior to mixing with part A .
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.
When first using the material, a sample should be visually inspected to be sure no crystallization is present. Crystallization of either the resin or
hardener can occur during shipment in cold weather. If the resin appears cloudy or the hardener becomes gummy, the component should be
warmed with the containers open and stirred until the material returns to its proper smooth liquid consistency.
PACKAGING Part A Part B
8-Pound Density
Free Rise*
Cubic Inches per Kit
16-Pound Density
Double Load*
Cubic Inches per Kit
Quart Kits 1 lbs. 2 lbs. 648 324
Gallon Kits 4 lbs. 8 lbs. 2,592 1,296
5-Gallon Kits 20 lbs. 40 lbs. 12,960 6,480
55-Gallon Drum Kits 225 lbs. 450 lbs. 148,800 72,900
*NOTE:
Free Rise means a foam is poured into an open mold, no top. A cubic foot of a 3-pound density will weigh 3 pounds. Double
Loading, a good starting point for closed molds is to double the amount of material used in its free rise state, this helps to capture the
parts detail and create a more resilient skin. Our cured samples represent double loading.
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 Diethanolamine and Ethylene glycol, 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.
Scan QR code to see our How-to Foam
Video
by | Sep 27, 2025
TC-284 A/B Page 1 of 2 Date: 06/20/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-284 A/B
8-13 LB. VARIABLE RATIO, SELF-SKINNING
FLEXIBLE FOAM
TC-284 A/B is a two-component, self-skinning, flexible polyurethane foam. The cured material feels similar to an auto arm rest pad.
BJB s 6800 Series Pigments may be added to the B side for developing a wide range of colors. End users can adjust firmness with a
slight ratio change as listed below. Common applications are prototypes, bumper/crash pads, arm rests, movie special effects props and
more. Skin thickness is controlled by material/ mold temperature, and the loading of the mold.
Note: TC-284 at a ratio of 50/100 is a firm, 8 lb. density foam. At 30/100 ratio, the result will be a softer feel but the density increases
to 13 lbs. per cubic foot.
HANDLING PROPERTIES
8# DENSITY
For a Firm Feel
13# DENSITY
For a Softer yet Denser Foam
Mix Ratio (by weight)
50 parts A
100 parts B
30 Parts A
100 Parts B
Density, (free rise) lbs/ft
3
8 13
Density, (free rise) kg/m
3
128 208
Cream Time @ 77 F (25 C) 20 25 seconds 25 30 seconds
Rise Time 2 2.25 minutes 2 minutes
Demold Time @ 77 F (25 C) 30 minutes 30 minutes
Part A Part B
Specific Gravity @ 77 F (25 C) 1.15 1.04
Color Amber Off-white
Viscosity (cps) @ 77 F (25 C) Brookfield 425 1,915
*The density and processing times listed are derived from a statistical average of long-term testing. We recommend a test mix be
performed before use.
MIXING:
Mixing is best with a high speed drill or air motor with a Jiffy
Mixer . The blade shears the material and provides a thorough mix
within the 8 to 10 second period generally established for achieving
a uniform blend. Mixing too long or not enough can result in poor
material performance.
Once mixed, the material should be immediately poured. If too
much time goes by, the foam will rise in the mix container and the
batch may be lost.
When pouring the foam, avoid trying to scrape any material from
the container sidewalls or bottom. Generally, there isn t enough
time to do this and more importantly there may be material that is
not well mixed on the container sides.
POLYURETHANE FOAM SYSTEMS
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
TC-284 A/B Page 2 of 2 Date: 06/20/2022
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.”
MOLD PREPARATIONS:
The mold should be well sealed and released. Foams will seek moisture through release waxes and stick to mold surfaces if an
insufficient seal exists. Sealing can be accomplished by using acrylic or other similar sealers. The mold should be warmed to between
75- 85 F (24-29 C) prior to casting the first part. Once a mold is heated and cycled it will maintain heat for continued production.
Release systems vary in accordance to the type of mold used; however, as a general product we recommend Challenge 95 Release or a
mold release paste wax from our line of products. As a rule, silicone based releases do not work with either the flexible or rigid foam
groups of materials. The silicone migrates and often causes poor surface conditions. Silicone will also inhibit the adhesion of paints and
over-coatings. The best molds for production (rather than prototype or limited production parts) are either machined aluminum molds or
epoxy molds. Epoxy molds offer the least expensive method for long term use when cycle times allow slower heat dissipation.
DEMOLDING FOAM MATERIALS:
TC-284 A/B can be removed from the mold within a 30-minute timeframe. However, smaller masses will develop lower exothermic
reaction and may require a slightly longer cure time. It is recommended that foam parts be crushed or squeezed after demolding to
remove residual gases remaining in the cell structure. This will help to reduce post shrinkage and aid in reducing natural odors from the
foam part.
NOTE:
The B component should be gently shaken or stirred to re-blend prior to mixing with part A .
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.
When first using the material, a sample should be visually inspected to be sure no crystallization is present. Crystallization of either the resin or
hardener can occur during shipment in cold weather. If the resin appears cloudy or the hardener becomes gummy, the component should be
warmed with the containers open and stirred until the material returns to its proper smooth liquid consistency.
PACKAGING Part A Part B
8-Pound Density
Free Rise*
Cubic Inches per Kit
16-Pound Density
Double Load*
Cubic Inches per Kit
Quart Kits 1 lbs. 2 lbs. 648 324
Gallon Kits 4 lbs. 8 lbs. 2,592 1,296
5-Gallon Kits 20 lbs. 40 lbs. 12,960 6,480
55-Gallon Drum Kits 225 lbs. 450 lbs. 148,800 72,900
*NOTE:
Free Rise means a foam is poured into an open mold, no top. A cubic foot of a 3-pound density will weigh 3 pounds. Double
Loading, a good starting point for closed molds is to double the amount of material used in its free rise state, this helps to capture the
parts detail and create a more resilient skin. Our cured samples represent double loading.
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 Diethanolamine and Ethylene glycol, 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.
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