The main materials of the 650 degrees low temperature calcium silicate board product are SiO 43%, CaO 44%, and reinforced fibers, which do not contain asbestos. It is an efficient energy-saving and thermal insulation product, fully known as "fiber reinforced calcium silicate board". The product is made by stirring, heating, gelation, forming, pipe hardening, and drying. It has the characteristics of light volume, low thermal conductivity, and high bending and compressive strength.