PolyFoam R8 is a two-part, rigid polyurethane casting foam. This self-skinning foam has a free-rise density of 8 lb/ft³, but should be cast at a density of 8 to 20 lb/ft³ to achieve good surface detail and mould fill.
Generally, PolyFoam products should be cast in Tinsil or Platsil silicone moulds. Barrier coats (a fast drying primer paint) can be applied to silicone moulds before casting foam in order to produce pre primed parts right out of the mould.
PolyFoam can also be poured into Poly 74 & 75-Series polyurethane rubber moulds that have been coated with PolyCoat Sealer & Release Agent.