The chemical composition of glass bottles and jars varies according to their use requirements, forming methods, forming speed, process characteristics, and raw material varieties. Most bottles and jars use soda lime silicate glass. The main components of soda lime silicate glass are SiO2, Na2O and CaO. The introduction of appropriate amounts of Al2O3 and MgO can reduce the crystallization tendency of the glass, enhance the chemical stability and mechanical strength of the glass, and improve the forming properties of the glass. The chemical composition of soda-lime bottle glass in most countries in the world is: SiO270 ~ 74%, CaO and MgO 10 ~ 14%, Na2O and K2O 13 ~ 16%, Al2O3 1.5 ~ 2.5%. When manufacturing colorless glass bottles and cans, the content of Fe2O3 in the quartz sand is very low (usually about 0.03%). In ordinary soda-lime glass, Cr2O3 and Fe2O3 are added, the glass is emerald green, and sulfur-carbon or MnO2 and Fe2O3 are added, and the glass is brown. Bottles and cans containing medicines are required to have high chemical stability and are made of borosilicate glass. High-grade cosmetic bottles are usually made of crystalline glass containing lead, barium or zinc. Some are opacifying glass, and fluoride is generally used as an opacifying agent.