- Functions:Core Material
- Chemical Family:Polyisocyanurates
- Core Type:Thermoset Foam
- Color:Yellow
ELFOAM® P400 is a 4.0 lb/ft3 (64 kg/m3), rigid, unfaced, closed cell polyisocyanurate foam supplied as blocks, sheets and fabricated shapes for a variety of insulation, core material and carving applications. Polyisocyanurate foam (polyiso) is similar to polyurethane foam but offers greater dimensional stability over a wider service temperature range.