How to make glass

Actually we did not obtain glass as the form we use now, but it is a mixture of some materials that processed in high temperature. The materials are sand (silica, SiO₂), limestone (calcium oxide, CaO), and soda ash (sodium carbonate, Na₂CO₃). We can add other material to get better quality of glass. To make glass, first the three basic materials heated with a high temperature inside the furnace. After it blended well, a high temperature liquid glass is directed into two machines, plate making machine and bottle-glass making machine. Inside the plate making machine, liquid glass is flowed through a roller to make thin plate glass, and it is pressed until we get the shape of glass we want. At the bottle-glass machine, the high temperature liquid glass placed at the top of the removable mould and blew by air. The liquid will puff and stick at the mould surface. After it cold enough the surface of the glass is softened by grindstone and finally it is ready to use.

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