Asbestos-free calcium silicate shell as insulation material features: good insulation: the material is made of hollow spheres (average size of 50 microns) . Thermal conductivity basically keeps temperature constant; long service life: at design application temperature, calcium silicate plate does not shrink, deform or disintegrate. Insulation is maintained throughout the life cycle; Gao Qiang: light weight but high strength. Toughness is one of the highest in inorganic materials. This feature has the advantage of reducing the weight load of a kiln; easy installation: All That is needed is a board of ordinary woodworking tools easily tethered with glue to form the desired shape; SAFE operation: calcium silicate is not corrosive or toxic. It does not produce gases or odors at high temperatures. It is proposed that any harm to the environment and human health asbestos-free calcium silicate shell tube widely used: in metallurgy, Petroleum, chemical, electric power and other aspects of insulation; Insulation duct, high temperature air duct. Insulation construction, ships and trains. Non-asbestos calcium silicate shell features: low thermal conductivity, stable insulation performance; high working temperature, no combustion, no deformation; low density, white color and smooth appearance; Better folding and compression strength than insulating materials with the same density; non-toxic, non-corrosive, non-polluting;