... light weight, high strength, Low thermal conductivi Fireproof Calcium Silicate Board is a new white & hard thermal insulating ... non-toxic, easy cutting & sawing.Product NameFireproof Calcium Silicate BoardHCS-170HCS-220HCS-270Bulk densityKg/m3170220270Max temperature.C105010501050Bending strengthMpa0 ... ratio%1.50(1000.C,16hrs)1.50(1000.C,16hrs)1.50(1000.C,16hrs) Fireproof Calcium Silicate Board