Patent ID: 7825288
Filing Date: 2010-11-02
Classification: C03C

Abstract:
1. A borosilicate glass consisting essentially of: about 1 to about 1.3 mole parts of a combination of monovalent cation oxides (R 2 O) and divalent cation oxides (RO); about 1 to about 1.4 mole parts trivalent cation oxides (R 2 O 3 ); about 1.2 to about 4.2 mole parts of a combination of tetravalent cation oxides (RO 2 ) and pentavalent cation oxides (R 2 O 5 ); and wherein SiO 2 is present in an amount greater than 30 weight percent, B 2 O 3 is present in an amount between 8.7 and 15.3 weight percent, Al 2 O 3 is present in an amount between 7 and 15.1weight percent, CaO is present in an amount between 0.2 and 2.3 weight percent, and fluorine is present in an amount between about 1 to about 3 weight percent.