... hard forms of polyurethane between 2 layers (fireproof material). Suitable for varioud roofs and walls referring to the large size factory ... insulation.Fine fireproof:test by national quality inspection center for fireproof building material,all its index reach grade A1Packing:as per your ... thickness is 0.326mm3.Pu density is 35-40kg/m34.Panel thickness is 20mm,30mm,40mm,50mm,75mm,100mm.