Material of glassware
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Glassware is mostly made of soda-lime silicate glass, which is colorless and transparent. Of course, there are also various color containers. The iron content in glass is generally less than 0.02%. Adding coloring agent to glass raw material can make colored glass; adding opacifier to make opalescent glass.
Potassium lead silicate glass, also known as lead crystal glass, is used to manufacture high-end art utensils such as goblets, perfume bottles, fruit bowls,s and so on. This kind of glass contains PbO, has a high refractive index and dispersion, is especially bright when the edge surface is ground, has a high specific gravity, and it makes a crisp sound when struck.
PbO content of more than 30% is full-lead crystal glass, PbO content of 24~30% is medium lead crystal glass, PbO content of less than 18% is low lead crystal glass, and BaO-containing barium crystal glass. Cooking utensils such as coffee pots and other products use heat-resistant borosilicate glass, which has a low coefficient of thermal expansion and strong resistance to rapid temperature changes. Glass-ceramics have better heat resistance and resistance to rapid temperature changes, and high mechanical strength, which is suitable for making cooking utensils and utensils that are often washed in hotels and hotels.