... not emit harmful gases when meet fire. Fire 650 degrees, as a refractory material, the thick up of 90mm walls can reach to ... , 300mm thick up wall can reach to 520 minutes fire resistance.Sound insulation: Due to a unique porous structure, so ... seismic than the brick level.Pro-environment: Manufacturing, transportation, all use the process of pollution, to protect arable land, saving energy, is ...