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Glass as a material consists of components of quartzsand, chalk, potash and soda. These are melted at around 1400°C.When talking about drinking glasses, the normed terms are normal glassquality, crystal glass and lead crystal glass glassware that consist out of less than 4% of leadoxideare called glass. Glassware that consists of more then 10 percentLead are known as crystal and glassware that consists of more then 24% leadare known as lead crystal.