Patent ID: 8461070

Claim:
A float glass composition comprising the following constituents, the amounts of which are expressed as percentages by weight: SiO 2 60-75% Al 2 O 3 0-5% Na 2 O 13-18% K 2 O 0-5.5% CaO 0-4.9% MgO 0-1% SO 3 0-1% Fe 2 O 3 (total iron) >0.01% TiO 2 0-1% and one or both of: SrO 0-10% BaO 4-10% with the proviso that the summed amount of SrO and BaO is greater than 4%, and further wherein the performance exhibited by the glass of the composition is: (a) greater than or equal to 29 at LT A greater than or equal to 70%, and (b) greater than or equal to 27 at LT A greater than or equal to 75%, for glasses having a thickness of 5 mm or less.