Patent ID: 7732358

Claim:
A glass consisting essentially of the following formula: a (A′ 2 O) x b (G f O) y c (A″O) z where A′ represents at least one alkali metal glass modifier comprising lithium that functions as a fluxing agent, G f represents at least one glass former comprising boron and phosphorus, A″ represents at least one glass network modifier comprising zinc oxide, lead oxide, aluminum oxide, zirconium oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide, or silicon oxide, or any combination thereof, a represents the number of fluxing agents present and ranges from about 1 to about 5, b represents the number of glass formers present and ranges from about 1 to about 10, c represents the number of glass network modifiers and ranges from about 1 to about 30, x represents the mole fraction of fluxing agent and is from about 0.11 to about 0.225, y represents the mole fraction of glass former and is from about 0.475 to about 0.675 with the proviso that the amount of boron as B 2 O 3 is at least about 0.040, z represents the mole fraction of glass network modifiers and is from about 0.10 to about 0.30, x+y+z=1, and x<y, and wherein said glass is acidic.