Explain why Soda Ash (Na2CO3) is used in the glass manufacturing?
- busterwasmycatLv 711 months ago
Adding soda lowers melting point (primary purpose) and alters some of the properties of the glass. Most of the additives used in glass making impart some desired property to the glass product.
Pure silica glass is absolutely brutal to work with: has a very high melting point and is extremely viscous.
- 冷眼旁觀Lv 711 months ago
Soda glass is a mixture of sodium silicate and calcium silicate. Soda glass is made of fusing sodium carbonate and calcium carbonate with silica (silicon dioxide, from sand) at 1500°C.
The equations are:
Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂
CaCO₃ + SiO₂ → CaSiO₃ + CO₂