TC-890 A/B Page 1 of 2 Date: 11/01/2022
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-890 A/B
RIGID 80 SHORE D URETHANE CASTING SYSTEM
TC-890 A/B incorporates a non-mercury based catalyst system that produces a tough 80 shore D material with a 5-minute
work time. This system can be used to hand pour electronic housings, models of all kinds, and point of purchase items.
This system is also available in a 20-minute work time (TC-892), and a 12-minute work time (TC-891).
Non-mercury RoHS compliant
Convenient mixing ratio: 1 to 1 parts by weight Low viscosity, flows easily
Demold time: 1-2 hours at ambient temperature in
a silicone rubber mold (1/8 thick section)
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240 80 2
Density (g/cc) ASTM D792 1.14
Cubic Inches per Pound N/A 25
Color/Appearance Visual Off White/Opaque
Tensile Strength (psi) ASTM D638 7,600
Tensile Modulus (psi) ASTM D638 2.4 x 10
5
Elongation (%) ASTM D638 10
Flexural Strength (psi) ASTM D790 10,000
Flexural Modulus (psi) ASTM D790 2.5 x 10
5
Shrinkage (in/in) linear 12 x1/2 x1/2 0.004
Izod Impact, notched (ft-lb/in) ASTM D256 0.7
Heat Deflection Temperature @ 66 psi ASTM D648 195 F (90.6 C)
Heat Deflection Temperature @ 264 psi ASTM D648 177 F (80.6 C)
Note: Reported physical properties based on elevated temperature cured test specimens.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 88 100
Specific Gravity @ 77 F (25 C) 1.18 1.04
Color Yellow White
Viscosity (cps) @ 77 F (25 C) Brookfield 325 830
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 725
Work Time, 100g mass @ 77 F (25 C) 5 minutes
Gel Time 7 minutes
Demold Time @ 77 F (25 C) 1 2 hours
Properties above are typical and not for specifications.
TC-890 A/B Page 2 of 2 Date: 11/01/2022
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.”
IMPORTANT MIXING DIRECTION:
It is important to remix the B components thoroughly prior to each use.
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:
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-7 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.
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. 2 lbs. 100
Gallon Kits 8 lbs. 8 lbs. 400
5-Gallon Kits 40 lbs. 40 lbs. 2,000
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-C8-10-branched
alkyl esters, C9-rich, which is known to the State of California to cause cancer. For more information, go to
www.P65Warnings.ca.gov.
Handling Guide