EC-39 Fast is a low viscosity slow setting urethane casting compound polymer. The low viscosity of the liquid components makes for easy hand or machine mixing applications.


Working Properties

Mix Ratio By Weight

100 parts A/ 28.26 part B

Mix Ratio By Volume

100 parts A/ 24 parts B

Viscosity @ 72°F (A Side)

30 CPS

Viscosity @ 72°F (B Side)

490 CPS


Part A:



Part B:

Clear Amber




Working Life @ 72°F

3 minutes

Demold Time* @ 72°F

15-20 minutes

Complete Cure Time* @ 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

8.56 lbs.

Weight/Gallon Part B

10.08 lbs.

Weight/Gallon Mixed

8.86 lbs.

Hardness @ 72° F

ASTM 2240-85

75-85 Shore A

Cubic inch per lb. of product


26.07 in3

Linear Shrinkage




Clean Up

Clean up with Mineral Spirits.

Dispose of all empty EC 39 Fast 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

EC 39 Fast 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 be between 70°-80°F and should not exceed 90°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