6 Lb. Polyisocyanurate Foam SheetsOur 6 lb. cubic foot Polyisocyanurate Foam is a rigid, closed cell foam used in insulation, sandwich core, and carving applications where strength is key. The properties of this foam are similar to those of our 6 lb. Mix and Pour Foam (#624 625), so it can be easily cut and shaped with a sharp knife or sandpaper, and its density is suited to hold greater details. Glue sheets together to form thicker blocks for shaping functional, moldless parts. Store