Importance

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Abstract

The invention relates to a glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass: 65≦SiO₂≦78% 5≦Na₂O≦20% 0≦K₂O<5% 1≦Al₂O₃<4% 0≦CaO<4.5% 42O₃) in a content ranging from 0.002 to 0.06% by weight and a (CaO/MgO) ratio which is less than 1. The invention corresponds to an easy chemically-temperable soda-silica type glass composition, which is more suited for mass production than aluminosilicate glass, and therefore is available at low cost, and with a base glass/matrix composition that is close to or very similar to compositions already used in existing mass production.

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First Claim