SpeedSet 380 is a low viscosity, two component, rapid set, semi-flexible polyurethane casting compound. When fully cured, SpeedSet 380 forms tough and durable plastic parts that are resistant to impact and abrasion.


Working Properties

Mix Ratio By Weight

59 parts A/ 100 part B

Mix Ratio By Volume

50 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

250 CPS

Viscosity @ 72°F (B Side)

800 CPS

Viscosity @ 72°F (Mixed)

650 CPS


Part A:



Part B:

Milky Clear




Working Life @ 72°F

3-5 minutes

Complete Cure* @72°F

24 hours

* Set time and Demold time depends on temperature and relative humidity.


Physical Properties

Specific Gravity (Part A)


Specific Gravity (Part B)


Specific Gravity (Mixed)


Weight/Gallon Part A

10.20 lbs.

Weight/Gallon Part B

8.68 lbs.

Weight/Gallon Mixed

9.19 lbs.

Cubic inch per lb. of product


Hardness @ 72° F

ASTM 2240-85

60-70 Shore D

Tensile Strength

ASTM D-412 die C



ASTM D-412 die C



Clean Up

Dispose of all empty SpeedSet 380 component containers in accordance with local, state and federal regulations. Empty component containers can be rendered non-hazardous by rinsing the containers with a small amount of mixed material and allowing the solvents to evaporate. The containers will then contain non-hazardous cured urethane.

Storage and Shelf Life

SpeedSet 380 is shipped from the factory in sealed containers. The containers should be stored in a cool, dry area that is protected from direct sunlight and moisture. Storage temperatures should not exceed 80°F. The shelf life of the factory sealed containers stored under these conditions is six months. Containers that have been opened should be resealed immediately after material has been removed in order to prevent solvent evaporation.


Shipping Class: Class 55 Non-hazardous