Inorganic composition article

Abstract

An inorganic composition article obtained by strengthening a crystallized glass, wherein the crystallized glass comprises one or more kinds selected from α-cristobalite and α-cristobalite solid solution as a main crystal phase, the crystallized glass comprises, by mass % in terms of oxide, a content of SiO2 of 50.0% to 75.0%, a content of Li2O of 3.0% to 10.0%, a content of Al2O3 of 5.0% or more and less than 15.0%, a content of B2O3 of more than 0% and 10.0% or less, a content of P2O5 of more than 0% and 10.0% or less, and a mass proportion SiO2/(B2O3+Li2O) of 3.0 to 10.0, and the inorganic composition article has a compressive stress layer on the surface, and has a ratio (CS30/CT) of a compressive stress (CS30) at a depth of 30 μm from the outermost surface to a central tensile stress (CT) of more than 1.64 and 2.50 or less.

Dependencies are inferred from the claim text.