ProtoCast 85R is a very low viscosity, rapid setting, and rigid urethane compound with high strength and durometer. This system will cure quickly to a hard, tough impact resistant casting. ProtoCast 85R is non-sensitive to moisture after cure and will readily bond to itself, as stage pours are required. The 1:1, by volume, mix ratio makes for easy hand or machine mix. ProtoCast 85R is recommended in applications where a “thermoplastic feel” is desired.

Properties

Working Properties

Mix Ratio By Weight

100 parts A/ 86 part B

Mix Ratio By Volume

100 parts A/ 100 parts B

Viscosity @ 72°F (A Side)

50 CPS

Viscosity @ 72°F (B Side)

100-150 CPS

Viscosity @ 72°F (Mixed)

75 CPS

Color

Mixed:

White

Working Life @ 72°F

12-14 minutes

Demold Time* @72°F

1 hour

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

 

Physical Properties

Specific Gravity (Part A)

1.099

Specific Gravity (Part B)

0.953

Specific Gravity (Mixed)

1.07

Specific Gravity (Cured)

1.10

Weight/Gallon Part A

9.171 lbs.

Weight/Gallon Part B

7.95 lbs.

Weight/Gallon Mixed

8.56 lbs.

Cubic inch per lb. of product

26.98 in3/lb.

Hardness @ 72° F

ASTM 2240

40-50 Shore D

Tensile Strength

ASTM D-638

4,500psi

Elongation

ASTM D-638

3.5%

Impact Strength

ASTM D-256

1.5 ft. lb/in

Linear Shrinkage

ASTM D-2566

0.05%

Deflection Temperature

ASTM D-758

135°F

Compression

ASTM D-695

2,870

Machinability

 

Excellent

 

Storage and Shelf Life

ProtoCast 85R 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 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

Shipping Class: Class 55 Non-hazardous