TC-872 A/B Page 1 of 2 Date: 06/29/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
TC-872 A/B
RIGID 70 SHORE D HIGH HEAT RESISTANT
POLYURETHANE CASTING SYSTEM
TC-872 A/B is a RoHS compliant, non-mercury based catalyst polyurethane system that produces a tough 70 shore D
material. This system has an exceptionally high impact and a high heat deflection temperature which in some cases can be
post cured without having to use fixtures.
High heat resistance High Impact
Non-mercury RoHS/REACH compliant
Working time of 10-12 minutes
PHYSICAL PROPERTIES TEST METHOD TEST RESULTS
Hardness, Shore D ASTM D2240-04e1 70 2
Density (g/cc) ASTM D792-00 1.13
Cubic Inches per Pound N/A 25.5
Color/Appearance Visual Translucent Pale Yellow
Tensile Strength (psi) ASTM D638-03 3,310
Tensile Modulus (psi) ASTM D638-03 71,350
Elongation (%) ASTM D638-03 28.3
Flexural Strength (psi) ASTM D790-03 3,315
Flexural Modulus (psi) ASTM D790-03 84,680
Shrinkage (in/in) linear 12 x x 0.004
Izod Impact, notched (ft-lb/in) ASTM D256-05 1.78
Heat Deflection Temperature @ 66 psi ASTM D648-04 240 F (115.6 C)
Note: Reported physicals based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio (by weight) 100 35
Mix Ratio (by volume) 100 32
Specific Gravity @ 77 F (25 C) 1.06 1.16
Color Colorless Amber
Viscosity (cps) @ 77 F (25 C) Brookfield 830 650
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 750
Work Time, 100g mass @ 77 F (25 C) 10 12 minutes
Gel Time 13 15 minutes
Demold Time @ 77 F (25 C) 2 3 hours
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-872 A/B Page 2 of 2 Date: 06/29/2020
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.”
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 . For additional information on
the use of this product, refer to BJB Guidelines for Handling Polyurethane Products. If further information is required,
please call BJB s technical staff for assistance.
NOTE #2:
The natural color of TC-872 A/B is a translucent pale yellow. 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.
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. 0.7 lb. 69
Gallon Kits 8 lbs. 2.8 lbs. 275
5-Gallon Kits 40 lbs. 14 lbs. 1,377
55-Gallon Drum Kits 400 lbs. 140 lbs. 13,770
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 Toluene diisocyanate, which are known to the State of
California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
Handling Guide