UV-transmitting glasses
AssigneeCorning Glass Works
InventorGerald J. Fine
Life of this patent
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Abstract
Alkali boroaluminosilicate glasses exhibiting moderately high thermal expansion coefficients, good melting characteristics, and a UV transmittance of at least 80% in 1 mm thickness at a wavelength of 254 nm are described, such glasses consisting essentially of about 58-62%, SiO.sub.2, 15-18% B.sub.2 O.sub.3, 11.5-14.5% Al.sub.2 O.sub.3, 1-2.5% Li.sub.2 O, 5.5-6.5% Na.sub.2 O, 0-2% K.sub.2 O, and 0-0.6% Cl.
Claims1
An ultraviolet transmitting glass article consisting essentially, in weight percent, of about 58-62% SiO.sub.2, 15-18% B.sub.2 O.sub.3, 11.5-14.5% Al.sub.2 O.sub.3, 1-2.5% Li.sub.2 O, 5.5-6.5% Na.sub.2 O, 0-2.0% K.sub.2 O, and 0-0.6% Cl, the article having a thermal expansion coefficient (0.degree.-300.degree. C.) in the range of 56-62.times.10.sup.-7 /.degree.C. and an ultraviolet transmittance, in 1 mm cross section, of at least 80% at a wavelength of 254 nm.
Dependencies are inferred from the claim text.