Rigid General Purpose Urethane Plastic – TC-850

Urethane Castings

Rigid General Purpose Urethane Plastic – TC-850 A/B

75 Shore D Polyurethane Casting System

TC-850 A/B produces a high impact rigid 75 Shore D material that is commonly used to make computer housings, models of all kinds, artwork, and can also be used for electronic component encapsulation. It provides a working time of 6 – 7 minutes.

  • RoHS/REACH Compliant
  • High impact rigid material
  • Odorless, clean white
  • One to two hour demold time
  • Excellent for vacuum or pressure casting
  • Low viscosity

Cure Schedule / Heat Curing:

Most of the physical properties can be achieved in 5-7 days at ambient temperature, 77°F (25°C). In order to achieve maximum physical properties, a post cure with heat is required. 24 hours at ambient temperature, 77°F (25°C), followed by 16 hours at 180°F (82°C). Support of the part may be required to prevent part deformation during heat cure.

Vauum De-Glassing / De-Airing:

It is advisable whenever possible to evacuate entrapped air prior to casting this system. The use of de-airing agent, (BJB’s AF-4), can speed the process.

NOTE: TC-850 A/B should be stored at ambient temperature and the TC-850 “B” component may require vacuum de-airing prior to combining it with the “A” component. Evacuation of the mixing components is mandatory in order to achieve best results. It is recommended that the “A” & “B” components as well as the mold should be pre-conditioned to a minimum of 80°F (26.7°C) prior to use.


Store at ambient temperatures, 65-80ºF (18-27ºC). 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 resealing.

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. 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.