Making glass

In general, there are several steps to make glass. First, the basic ingredients, which are sand, soda, and limestone are put and mixed together in the furnace. In that melting pot, they are heated at temperatures of 1200^o Celcius to be the molten glass material. The molten glass is divided into 2 kinds of process to get the shape of the glass. In the first kind of process, the molten glass is poured into rollers machine to be pressed. The result is the plate shaped glasses. The second kind of process is shaping bottle glass. In this case, the molten glass is put into the removable mould. During the shaping process, the air is blown into the mould. Then, the bottle glass is safely removed from the mould. After shaping, the glasses have to be cooled down before they are used or repackaged.