Calcium silicate, we also call it Ca-Si or CaSi, is the chemical compound Ca2SiO4, also known as calcium orthosilicate and sometimes formulated by 2CaO.SiO2.
It is one of a group of compounds obtained by reacting calcium oxide and silica in various ratios, e.g. 3CaO•SiO2, Ca3SiO5; 2CaO•SiO2, Ca2SiO4; 3CaO•2SiO2, Ca3Si2O7 and CaO•SiO2, CaSiO3.
Calcium silicate is a white free-flowing powder derived from limestone and diatomaceous earth. It has a low bulk density and high physical water absorption.
It is used in roads, insulation, bricks, roof tiles, table salt and occurs in cements, where it is known as belite (or in cement chemist notation C2S).
It is used as an anti-caking agent in food preparation and an antacid. It is approved by the United Nations’ FAO and WHO bodies as a safe food additive in a large variety of products.

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