Patent ID: 7670975

Claim:
An alkali free glass with a matrix composition comprising, as represented by the mass percentage: SiO 2 49 to 69.5%, Al 2 O 3 1.5 to 19.5%, B 2 O 3 5 to 10.5%, MgO 0 to 12.5%, CaO 0 to 16.5%, SrO 0 to 24%, CaO + SrO 8 to 24%, and MgO + CaO + SrO 16 to 28.5%; wherein glass comprises substantially no alkali metal oxide, As 2 O 3 , Sb 2 O 3 and BaO; temperature of the glass at which the viscosity becomes 10 2 dPa·s, is at most 1,600° C.; the glass comprises sulfur in an amount of from 0.001 to 0.1% as calculated as SO 3 , as represented by the mass percentage, per 100% of the total amount of the matrix composition; and the weight loss of hydrochloric acid in the glass is at most 0.6 mg/cm 2 .