18814160. ALKALI-FREE GLASS AND GLASS SHEET (AGC Inc.)
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ALKALI-FREE GLASS AND GLASS SHEET
Organization Name
Inventor(s)
Hirofumi Tokunaga of Tokyo (JP)
ALKALI-FREE GLASS AND GLASS SHEET
This abstract first appeared for US patent application 18814160 titled 'ALKALI-FREE GLASS AND GLASS SHEET
Original Abstract Submitted
An alkali-free glass, includes, as represented by mol % based on oxides: 50% to 76% of SiO; 2% to 6% of AlO; 18% to 35% of BO; 1% to 3.5% of MgO; 0.5% to 4% of CaO; 1% to 4.5% of SrO; and 0% to 3% of BaO, in which an expression (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the expression (A) is 3.5 to 6, an expression (B) is [AlO]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (B) is −2 to 2, an expression (J) is ([MgO]+[CaO])/([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (J) is 0.2 to 0.7, and Δβ-OH is 0 mmto 0.1 mm.
