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