IsoCast RCR 739

IsoCast RCR 739 is used to make castings from rigid and flexible molds. Some of the most common uses of IsoCast RCR 739 are point-of-purchase displays; rapid prototypes; special effects; taxidermy; and sculpture reproductions. However IsoCast RCR 739 can be used for any application that requires a lightweight; durable plastic.
IsoCast RCR 739 is a two-part; MDI-based polyurethane casting system. It is mixed one-to-one by volume and cures at room temperature. IsoCast RCR 739 begins to gel in about 15 minutes and cures to a white color.



  • Point of Purchase Displays
  • Rapid Prototypes
  • Sculpture Reproductions
  • Special Effects
  • Taxidermy


  • Convenient mixing ratio (s)
  • Fast hardness development
  • Low shrinkage
Product Types

Casting Resin


Product Testing

Test PerformedTest Results
Color - ISOAmber  
Color - POLWhite  
Compound Specific Gravity1.09  
Compressive Strength - ASTM D69510,200 psi 
Compressive Yield Strength - ASTM D69510,200 psi 
Demold Time0.5-1 Hour 
Elongation - ASTM D41210 % 
Full Cure7 Days 
Gel Time - 100 gram sample, 74°F15-25 Minutes 
Glass Transition Temperature - DSC method118.4 °F 
Hardness - ASTM D2240 - Shore D76-80 Shore D 
Heat Distortion Temperature - ASTM D648137.3 °F 
ISO Processing Temperature74 °F 
Izod Impact Notched - ASTM 256A0.11 
Izod Impact Unnotched - ASTM 256E13.4 
Izod Impact-Notched, Four Specimens - ASTM D256-93A0.21 
Linear Shrinkage - ASTM D25660.001 in/in 
Mix Time - by Hand1 Minutes 
Modulus of Elasticity - ASTM D7901897 psi 
POL Temperature74 °F 
Pot Life - 100g12-15 Minutes 
Ratio by Volume - ISO:POL1-1  
Ratio by Weight - ISO:POL1.09-1  
Rebound, Bayshore % - ASTM D263220 % 
Reversion Temperature270 °F 
Shrinkage.001 % 
Specific Gravity - 74°F, ISO1.15-1.25  
Specific Gravity - 74°F, POL.99-1.1  
Split Tear - ASTM D470115 pli 
Stress - ASTM D790 - at 5% Strain68.2 psi 
Tear Strength - ASTM D624, Die C820 pli 
Tensile Strength - ASTM D4128000 psi 
Viscosity - ASTM D-2196 - 74°F, ISO50-200 cps 
Viscosity - ASTM D-2196 - 74°F, POL300-800 cps 

Posted on

December 18, 2020