Hard glass or Potash glass

Potash glass/Hard glass:-
Potash glass is the mixture of potassium and calcium silicate. 
Chemical formula:- K₂O.CaO.6SiO₂
Potash glass or hard glass is formed when potassium carbonate, calcium carbonate and silicon oxide is heated at appropriate temperature.

K₂Co₃+CaCo₃+6SiO₂---------> Potash ɡlass

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