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Ion exchange-strengthened silicate glass filter for ultraviolet light

  • US 4,022,628 A
  • Filed: 09/05/1975
  • Issued: 05/10/1977
  • Est. Priority Date: 09/05/1975
  • Status: Expired due to Term
First Claim
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1. An ion exchange-strengthened silicate glass made from a glass making batch in which each 100 parts by weight on an oxide basis consisting essentially of:

  • about 64 to about 75 parts silicon dioxide, about 5 to about 10 parts potassium oxide, about 4 to about 8 parts sodium oxide, about 4 to about 8 parts calcium oxide, and about 2 to about 10 parts cerium oxide.whereby upon ion exchanging at a temperature either above or below the strain point of said glass in a bath comprising salts of potassium and silver said glass provides an impact-resistant glass filter for ultraviolet light having a wavelength below about 400 nanometers and wherein said filter is transparent to light having a wavelength about 400 nanometers.

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