Glass for information recording medium substrate

Glass for information recording medium substrate

  • CN 101,541,696 A
  • Filed: 11/21/2007
  • Published: 09/23/2009
  • Est. Priority Date: 11/22/2006
  • Status: Active Application
First Claim
Patent Images

1. a glass for information recording medium substrate is characterized in that, is benchmark and contains 55~

  • 75% SiO when representing with mole % with following oxide compound 2, 1~

    12% Al 2O 3, 2~

    15% MgO, 0~

    1.5% CaO, amount to 1~

    20% Na 2O or K 2O, 0~

    8% TiO 2, its content is below 2%, to contain Li when containing BaO 2Its content is below 1%, to contain ZrO during O 2The time its content be below 0.5%.

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