GLASS FOR AIR-QUENCH TEMPERING AND AIR-QUENCHED TEMPERED GLASS

摘要

Provided is a glass that is for air-quench tempering and that, even when the glass is a thin glass that has a thickness of 2.5 mm or less, can have ample residual stress added thereto by air-quench tempering. A glass that is for air-quench tempering, that has an Fe³⁺ content, in terms of Fe₂O₃, of 2.2 mass% or more, that has an Fe²⁺ content, in terms of Fe₂O₃, of 0.8 mass% or less, that has an average thermal expansion coefficient α_50-350 at 50℃-350℃ of 75×10^-7/℃-90×10^-7/℃, that has a glass transition point of 500℃-600℃, and that has, between the glass transition point and the yield point thereof, a maximum α_max thermal expansion coefficient of 410×10^-7/℃ or higher.