Hard mica sheet (also called mica insulation board or asbestos-free mica board) is a rigid, high-performance insulation material made from mica paper bonded with 10–15% resin binder and pressed into dense sheet form. It is designed as a direct replacement for asbestos and other insulating boards in metallurgy, chemical engineering, electric heaters and electromechanical applications. The board combines high mechanical strength with good heat resistance, delivers a dielectric strength of 25 kV/mm at 20 °C (13 kV/mm after 1 h at 400 °C and 10 kV/mm after 1 h at 600 °C), and is UL recognized to 94V-0 flame class, file E216697. Kaxite supplies hard mica sheet model KXT-B502 / B502G with density 2.45 g/cm³, continuous heat resistance 500/700 °C, peak 700/1000 °C, in standard sizes 1200 × 1000 mm and 600 × 1000 mm, thickness 0.2–80 mm.
