Silicate as silicon dioxide (SiO2) in the form of polycrystalline as well as sand and chemical composition of quartz. Silicate melting point of about 2,000 ° C (3,632 ° F), so there are two common compounds or are added to the sand in the glass melting technology to reduce the melting temperature of about 1000 ° C it down. One of them is soda (sodium carbonate Na2CO3) or potash (potassium carbonate K2CO3 news). However, the soda makes the glass dissolves in water - is something people do not want, so they add lime (calcium oxide, CaO) are supplements to recover insoluble properties.
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