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Strengthening glass by ion exchange

  • US 5,674,790 A
  • Filed: 12/15/1995
  • Issued: 10/07/1997
  • Est. Priority Date: 12/15/1995
  • Status: Expired due to Term
First Claim
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1. In a method of strengthening a silicate glass article by developing compressive stress in a surface layer on the article through an exchange of alkali metal ions in the surface layer at an elevated temperature below the glass strain point, the step of minimizing stress relaxation by carrying out the ion exchange in the silicate glass containing less than 1% non-bridging oxygen atoms.

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