UV transmitting glasses

Details UV transmitting glasses UV transmitting glasses

2008-04-15

2008-04-15

Lorengo, J. A. (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S077000, C501S059000

Reexamination Certificate

active

07358206

ABSTRACT:
The present invention relates to a boroaluminosilicate glass which exhibits excellent UV transmission. In particular, the present invention is directed at an alkali fluorine-doped boroaluminosilicate glass comprising, in mole percent on the oxide basis, of 30-80% SiO2, 1-20% Al2(O, F2)3, 5-35% B2O3, 5-20% R2O, where R is Li, Na, K, Rb or Cs, and an amount of up to 12% of F. The glass possesses an R/Al molar ratio of between 0.4 to 3 and an F/O molar ratio of no greater than 0.35. The alkali fluorine-doped boroaluminosilicate glass of the present invention exhibits a UV transmission at 300 nm, of greater than 80%/mm.

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