CRYSTAL GLASS ARTICLE

[Object] This invention relates to crystal glass article not containing lead or barium that can be chemical strengthened easily and that is highly alkali-resistant and equivalent to lead crystal glass in quality. [Solving Means] Crystal glass article that can be chemical strengthened easily and that...

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Hauptverfasser: SHIBATA, NORIAKI, TOYODA, HIROKAZU
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:[Object] This invention relates to crystal glass article not containing lead or barium that can be chemical strengthened easily and that is highly alkali-resistant and equivalent to lead crystal glass in quality. [Solving Means] Crystal glass article that can be chemical strengthened easily and that is highly alkali-resistant and equivalent to lead crystal glass in quality can be produced with a glass composition containing: 62% to 65% by weight of SiO 2 2% to 3.2% by weight of Al 2 O 3 ; 10% to 12% by weight of Na 2 O; 8% by weight to less than 10.0% by weight of K 2 O; 3% to 4.2% by weight of CaO; 2% to 3.2% by weight of SrO; 6% to 7.2% by weight of ZnO; 2.2% to 3% by weight of TiO 2 ; 0% to 0.4% by weight of Sb 2 O 3 ; and 0% to 1.2% by weight of SnO 2 + Y 2 O 3 + La 2 O 3 + ZrO 2 .