Calcium silicate is the chemical compound Ca2SiO4, also known as calcium orthosilicate and sometimes formulated 2CaO.SiO2. Often referred to by its shortened trade name Cal-Sil or Calsil, calcium silicate is one of a group of compounds obtained by reacting calcium oxide and silica in various ratios.
Calcium silicate is a white free-flowing powder derived from limestone and diatomaceous earth, and it has a low bulk density and high physical water absorption. Calsil is used in roads, bricks, roof tiles, table salt and even therapeutic antacids. It’s chemical constitution makes it especially suitable as a prime ingredient in high-temperature insulation.