... is about 0.1 mm. its Surface closed and smooth, Thermal conductivity small, refractory degree equial or greager than 1700°C, ... fine particles, hollow, light weight, high strength, wear-resistant, thermal insulation, fire-retardant insulation and many other features.The chemical ... point (°C)≥1400thermal diffusivity (m2/h)0.000903-0.0015thermal conductivity (w/m·k)0.054-0.095compression strength (Mpa)≥ ...