They begun to make glass for about 5000 years before Christ in Syrian. The Syrian glass was made of soda,lime and sand. Today we make glass of sand (59%), soda (18%), dolomit (15%), calciumstone (4%), nefelin (3%) and sulfat (1%). You melt all the things together and then it will get stiffed. The glass' meltpoint is at 1400 degrees. The glass is cooled at 500 degrees.