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Fluorine-free superopaque enamel frits

  • US 5,013,362 A
  • Filed: 04/23/1990
  • Issued: 05/07/1991
  • Est. Priority Date: 08/19/1987
  • Status: Expired due to Term
First Claim
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1. Fluorine-free, opaque titanium white enamel frits having improved covering power for enamelling steel consisting essentially of:

  • 35 to 45 parts by weight of SiO2, ZrO2 or a mixture thereof,18 to 22 parts by weight of TiO2,18 to 22 parts by weight of B2 O3, Al2 O3 or a mixture thereof, 15 to 18 parts by weight of a mixture of lithium, sodium and potassium oxides,2.5 to 4.5 parts by weight of P2 O5, and0.8 to 1.4 parts by weight of magnesium oxide,with the proviso that the ratio of atomic numbers is as follows;

    (A+2B) to C is 0.9±

    0.05,(lithium+0.5 magnesium) to phosphorus is 1±

    0.1, and sodium to potassium is 1.2 to 2.6,wherein A is the sum of monovalent atoms, B is the sum of divalent atoms and C is the sum of trivalent atoms.

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