Patent ID: 8871663

Claim:
An alkali-free glass comprising no alkali metal oxide and comprising, based on the total weight of oxides present therein, 71 to 75 wt % of SiO 2 ; 1 to 2.8 wt % of B 2 O 3 ; 4 to 9.5 wt % of Al 2 O 3 ; 1 to 6 wt % of MgO; 1 to 11 wt % of CaO; 5.1 to 9 wt % of SrO; and 3 to 7 wt % of BaO, wherein the alkali-free glass has an elastic modulus higher than 77 GPa, and an inherent elastic modulus higher than 31 GPa·cm 3 /g, and density less than 2.5 g/cm 3 .