Photochromic glass and photochromic glass windows

Abstract

A photochromic glass, comprising: (i) a glass matrix that, comprising in mol percent (mol %) based on oxides: 66 mol %≤SiO2≤75 mol %; 8 mol %≤B2O3≤13 mol %; mol %≤Al2O3≤7 mol %; 1.5 mol %≤P2O5≤6 mol %, mol %≤Na2O≤5.5 mol %; 3 mol %≤K2O≤9.5 mol %; 0 mol %≤MgO≤4 mol %; 0 mol %≤Li2O≤0.05 mol %; 0 mol %≤BaO≤0.05 mol %; 0 mol %≤CaO≤0.05 mole %; wherein the amount of (Li2O+BO+CaO≤0.1 mole %); and (ii)) a plurality of photochromic agents, comprising in mol percent (%) with respect to the glass matrix: 0.07%≤Ag≤0.15%; 0.14%≤Cl≤0.25%; 0.025%≤Br≤0.04%; 0.0065%≤CuO≤0.015%, and wherein CuO/Ag≤0.22.

Dependencies are inferred from the claim text.