Patent ID: 11897812
Assignee: AGC INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC C  G | IPC C

Claim 0:
1. An alkali free glass
comprising SiO2 as a main component, Al2O3, and B2O3,
wherein the alkali free glass comprises, as represented by mol % based on oxides:
62 to 67% of SiO2, 
9 to 13% of MgO,
6 to 12% of CaO,
0.5 to 2.5% of SrO, and
0 to 0.5% of BaO,
wherein MgO/CaO is 1.1 or more,
wherein the alkali free glass has a value expressed by the following Expression (I) of 4.6 or less:

(7.87[Al2O3]−8.5[B2O3]+11.35[MgO]+7.09[CaO]+5.52[SrO]−1.45[BaO])/[SiO2]   Expression (I)

wherein the alkali free glass has a value expressed by the following Expression (II) of 1.06 to 1.32:

(−1.02[Al2O3]+10.79[B2O3]+2.84[MgO]+4.12[CaO]+5.19[SrO]+3.16[BaO])/[SiO2]   Expression (II)

wherein the alkali free glass has a value expressed by the following Expression (III) of 4.09 to 4.8:

(8.9[Al2O3]+4.26[B2O3]+11.3[MgO]+4.54[CaO]+0.1[SrO]−9.98[BaO])×{1+([MgO]/[CaO]−1)2}/[SiO2]  Expression (III).