TrueCast XL 7500 is a low viscosity rapid setting urethane compound polymer with high strength and durometer. The rapid cure properties of TrueCast XL 7500 allows rapid demold. Low viscosity and 1:1 by volume ratio makes for easy hand mixing and application. TrueCast XL 7500 will fully cure at room temperature (72° F) does not require heating for processing or post curing.

Application and Mix Ratio

Component A and component B are supplied in 1 and 5 gallon plastic containers. Component B should be thoroughly mixed before using. Component A does not need mixing. Carefully weigh out 100 parts of Component A to 92.03 parts Component B. Mix together for 1 to 2 minutes by hand using a spatula for small batches (1/2 gallon or less), or electric drill and jiffy mixer for larger batches. Use silicone mold release, even when using a silicone mold to avoid residual tack. Molds may be dusted with talc powder before pouring in liquid to produce a tack free permanent surface on cured parts. TrueCast XL-7500 is fully cured in 24 hours at 72°F. Colder curing temperatures will lengthen cure times. Warmer temperatures will greatly reduce working and cure times. Curing can be heat accelerated (150°F/ 8 hours) to speed up processing. Use methyl ethyl ketone (MEK), acetone or mineral spirits for clean-up.


Working Properties

Mix Ratio By Weight

100 parts A/ 92.03 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

4,500-5,000 CPS

Viscosity @ 72°F (B Side)

750-850 CPS

Viscosity @ 72°F (Mixed)

1,900-2,100 CPS


Part A:

Clear Yellow


Part B:

Black (Special colors on request)




Working Life @ 72°F

5-6 minutes

Full 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

9.17 lbs.

Weight/Gallon Part B

8.44 lbs.

Weight/Gallon Mixed

8.81 lbs.

Cubic inch per lb. of product

26.22 in3/lb.

Hardness @ 72° F

ASTM 2240-85

70-80 Shore A

Tear Strength

ASTM D-624

446-586 lb./in.

Tensile Strength

ASTM D-412 die C

3,800-4,100 psi


ASTM D-412 die C



Clean Up

Dispose of all empty TrueCast XL-7500 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 material to cure for 24 hours. The containers will then contain non-hazardous cured urethane.

Storage and Shelf Life

TrueCast XL-7500 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