Rigid Polyurethane Casting Foams

rigid-polyurethane-foamsPolytek’s rigid PolyFoam products are two-part, self-skinning polyurethane foams available in free-rise densities ranging from 2-8 lb/ft³. Molded densities range from 4-20 lb/ft³.


  • Self-skinning
  • Uniform cell structure
  • 1A:1B mix ratios
  • Practically odorless and do not contain toluene diisocyanate, MOCA, heavy metals or HCFC’s
  • Range of densities available
  • Can be colored with PolyColor Dyes

Typical Uses

  • Lightweight parts
  • Mold boxes and shells
  • Backing laid-up or sprayed-up castings
  • Props & displays
  • Patterns


Click here to view flexible polyurethane casting foams.

Product Options

Product Mix Ratio Free-Rise Density Molded Density
PolyFoam R-2 1A:1B 2.5 lb/ft³ 4-8 lb/ft³
PolyFoam R-5 1A:1B 5 lb/ft³ 8-20 lb/ft³
PolyFoam R-8 1A:1B 8 lb/ft³ 8-20 lb/ft³
Color Dyes PolyColor Dyes can be used to color PolyFoam. They are available in Black, Brown, Blue, Green, Red, Yellow, and a White Pigment.
Product Life Extender
Use Poly Purge Aerosol Dry Gas to extend product life by spraying it into containers before resealing.
PolyCoat Sealer & Release Agent PolyCoat can be applied to polyurethane molds to cast PolyFoam without a release agent. It can also be applied to silicone molds to improve performance and extend their life.

Product Literature: Technical Bulletin | Safety Data Sheets


Video Tutorial

Casting Rigid Polyurethane Foam (PolyFoam R-2) in Silicone Rubber Mold: