Patent ID: 7838451

Claim:
An alkali-free glass comprising, as represented by mol %: SiO 2 60 to 64%, Al 2 O 3 0 to 12%, B 2 O 3 5 to 10%, MgO 6 to 18%, CaO 0 to 18%, SrO 0 to 18%, BaO 0 to 2%, CaO + SrO 12 to 25%, MgO + CaO + SrO + BaO 18 to 30%, wherein the alkali-free glass contains substantially no alkali metal oxide and has a temperature T 2 , at which the viscosity becomes log η=2, of at most 1,600° C., and a temperature T 4 , at which the viscosity becomes log η=4, of at most 1,200° C.