Rigid Clear Urethane Plastic – TC-879

Urethane Castings

Rigid Clear Urethane Plastic – TC-879 A/B

78 Shore D Polyurethane Casting System

TC-879 A/B produces a high impact rigid 78 Shore D material with excellent heat resistance. This product is a clear casting system that is easy to tint or pigment. TC-879 A/B can be easily processed by hand or meter-mix dispense equipment.

NOTE #1: Faster de-molds can be achieved by pre-heating the A/B components and molds up to 150°F (66°C).

Cure Schedule / Heat Curing:

Most of the physical properties can be achieved in 5-7 days at 77ºF (25°C). You may use your own post-cure schedule but the physical properties may vary cure schedule of 1-3 hours at 77ºF (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.


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.

Safety Precautions

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. Use in well-ventilated areas. Avoid breathing vapors. If exposures cannot be kept at a minimum, a respirator may be necessary in addition to ventilation. The use of a positive pressure air supplied respirator is mandatory when airborne isocyanate concentrations are “not known” or exceeds OSHA’S TWA of 0.005 ppm. Air purifying, organic cartridge type respirators are not generally recommended to use when handling this material without implementation of an end of life service program. Observe OSHA regulations for respirator use (29 CFR 1910.134). Employers are responsible for selecting the correct respirator for each situation.

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. Solvent 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.