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The most familiar type of glass used for centuries in windows and drinking vessels is soda-lime glass, composed of about 75% silica, sodium oxide, calcium oxide and several minor additives. For mass production, this type of glass is melted in large gas fired units. Glass is totally recyclable. There are different types of processes for making bangles, tableware (glass-blowing) and small items like toys, idols for worship etc. (glass-fusing).