National Institute of Advanced Industrial Science and Technology

Isuzu Glass Company, Ltd.

Takaharu Hosokawa

Kohei Kadono

Toshihiko Einishi

Takashi Tarumi

Tatsuya Suetsugu

Kazuhisa Kimura

Naoki Kikuchi

Tadashi Hasegawa

The present invention provides a novel glass material that allows the production of a glass product having both excellent chemical durability and high precision by a press molding method. Specifically, the present invention provides a glass for press molding, comprising 38% to 45% by weight of SiO, 18% to 27% by weight of BO, 16% to 25% by weight of AlO, 2% to 12% by weight of ZnO, no more than 3% by weight of MgO, no more than 3% by weight of CaO, no more than 3% by weight of BaO, 13% to 18% by weight of LiO, no more than 3% by weight of KO, and no more than 2% by weight of NaO; wherein the glass has a deformation temperature of 520&#xb0; C. or lower; and the glass has a water resistance of grade 2 or higher as measured according to the Japanese Optical Glass Industrial Standard method for measuring the chemical durability of an optical glass.

Glass for press molding

Growing community of inventors

Osaka, Japan

Takaharu Hosokawa