Patent ID: 9701570
Date: 2017-07-11
CPC Classifications: B32B,C03B,C03C,Y10T

Claim:
1. A glass composition comprising: from about 55 mol. % to about 70 mol. % SiO from 9 mol. % to about 15 mol. % Al from about 10 mol. % to about 15 mol. % alkali oxide M from about 2 mol. % to about 5.5 mol. % divalent oxide RO, wherein R is at least one of Zn, Ca, or Mg; from about 12.5 mol. % to about 16 mol. % F from 0 mol. % to about 0.5 mol. % SnO from 0 mol. % to about 6 mol. % of colorant; wherein the glass composition is free from As and compounds containing As and is opalized as a result of phase separation during formation or with a post-formation heat treatment.