... acid and alkali erosion resistance,non-toxic Characteristic:Perlite door core is one of the thermal insulation refractory ... electrical, construction, defense industries and other departments.Perlite door core physical and chemical index:MarkCement combined with expanded ... /cm3300~400Compressive strength, MPa0.49~0.98Thermal conductivity, W/(m.K)-10.058~0.087Refractoriness, Deg.C1000Water absorption ...