IsoCast RCR 731

IsoCast RCR 731 (Formerly PAK Mark 1, IsoCast URP 7121) is used to make castings from rigid and flexible molds. Some of the most common uses of IsoCast RCR 731 are point-of-purchase displays, rapid prototypes, special effects, and sculpture reproductions. However, IsoCast RCR 731 can be used for any application that requires a lightweight, hard plastic.
IsoCast RCR 731 is a two-part polyurethane casting system. IsoCast RCR 731 is mixed one-to-one by volume and cures at room temperature. IsoCast RCR 731 produces a higher exothermic temperature than our other IsoCast RCR products, begins to gel in 1.5 minutes, and cures to an off-white color.



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


  • Convenient mixing ratio (s)
Product Types

Casting Resin



Posted on

August 28, 2020