Kabushiki Kaisha Toshiba

Showa Electric Wire & Cable Co., Ltd.

Hiroshi Imagawa

Mituo Kasori

Hiroshi Inoue

Akihiko Tsuge

Fumio Ueno

Akihiro Horiguchi

Kazuo Shinozaki

Kazuo Anzai

Takeshi Takano

Hironori Maki

Kenji Yagi

Osamu Kokubo

There is disclosed an aluminum sintered body prepared by sintering aluminum nitride and additives, which consists essentially of

Aluminum nitride sintered body

There are disclosed an aluminum sintered body comprising

Aluminum nitride sintered body and preparation thereof

A cladding glass for optical fiber comprises 60 to 80% by weight of silicon dioxide (SiO.sub.2), 0.5 to 10% by weight of aluminum oxide (Al.sub.2 O.sub.3), 9 to 17% by weight of an alkali metal oxide, 3 to 15% by weight of boron oxide (B.sub.2 O.sub.3) and more than 0 but not more than 3% by weight of fluorine (F). The cladding glass of this invention can simultaneously satisfy low refractive index and lowered viscosity, and is also excellent in water resistance and weathering resistance.

Cladding glass for optical fiber

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Yokohama, Japan

Hiroshi Imagawa