Opaque quartz glass and a method for producing the same

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United States of America Patent

PATENT NO 11993538
APP PUB NO 20240083803A1
SERIAL NO

18262842

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Abstract

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A quartz glass provides an opaque quartz glass having high light-shielding property, excellent mechanical strength and excellent cleaning resistance against hydrofluoric acid. By setting the maximum width of the amorphous bubbles existing in the opaque quartz glass to an average of 3 to 15 μm and the density to 2.15 g/cm3 or more, the mechanical strength after baking and the cleaning resistance by hydrofluoric acid are improved. The opaque quartz glass has a whiteness at a thickness of 10 mm of 75 to 90%, the reflectance of light with a wavelength of 0.24 to 2.6 μm at a thickness of 4 mm is 60 to 85%, and the bending strength after baking is 95 MPa. In addition, a foaming agent may be mixed in the opaque quartz glass. An opaque quartz glass having cleaning resistance against acid can be obtained.

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Patent Owner(s)

Patent OwnerAddress
TOSOH QUARTZ CORPORATIONYAMAGATA-SHI YAGAMATA 990-2251

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ito, Chiemi Yamagata, JP 4 3
Oba, Yuka Yamagata, JP 2 0
Suzuki, Takaya Yamagata, JP 53 852
Taniguchi, Takashi Yamagata, JP 91 1646

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