is referred to as “polyurethane”, and the fire rating of the foam is usually B3 and B2, as it is difficult for it to achieve B1.
PUR is characterized by good adhesion, strong physical properties, simple production process, and outstanding panel flatness
but its fire rating is low with heavy combustion smoke.
is referred to as “polyisocyanurate”, AKA improved polyurethane material. It is very easy for the foam to achieve a fire rating of
B1. PIR is characterized by excellent fire resistance, low smoke index, high oxygen index, better thermal
performance, outstanding foam stability and complex process.
