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Barium aluminosilicate glasses

  • US 5,326,730 A
  • Filed: 05/17/1993
  • Issued: 07/05/1994
  • Est. Priority Date: 01/22/1993
  • Status: Expired due to Term
First Claim
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1. A glass exhibiting a strain point higher than 660°

  • C., a liquidus temperature no higher than 1,175°

    C., a weight loss of less than 1 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

    C., and long term stability against devitrification at melting and forming temperatures, said glass being essentially free from alkali metal oxides and consisting essentially, expressed in terms of mole percent on the oxide basis, of
    
    
    space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 65-76 MgO 0-5 Al.sub.2 O.sub.3 7-11 CaO 0-10 TiO.sub.2 0-3 BaO 12-19 SrO 0-10 Ta.sub.2 O.sub.5 0-3 B.sub.2 O.sub.3 0-5 MgO + 0-15 TiO.sub.2 + 0.5-5. CaO + Ta.sub.2 O.sub.5 SrO ______________________________________

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