Generally speaking, the volume density for insulation brick between 0.4-1.5 g/cm3, porosity is from 66% to 73%, compressive strength is 1.5-8.1 MPa and thermal conductivity rate is 0.291-0.582 W / (Mk) (350 ℃ ).
Insulation brick is used in high temperature insulation layer of furnace that has high refractoriness and good thermal shock resistance.