Lead-free glass composition having properties similar to lead cr

Details Lead-free glass composition having properties similar to lead cr Lead-free glass composition having properties similar to lead cr

1993-10-20

1994-12-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 65, 501903, C03C 3089, C03C 3078

Patent

active

053765974

ABSTRACT:
A glass composition is disclosed wherein the density and the refraction index and the dispersion value of light are equal to or higher than those of conventional lead-containing crystal glass while no lead is contained therein at all. The glass composition comprises 50 to 60% by weight of SiO.sub.2, 5 to 13% by weight of K.sub.2 O, 5 to 8% by weight of TiO.sub.2, 10 to 15% by weight of BaO, 5 to 10% by weight of ZnO, 3 to 10% by weight of Na.sub.2 O, 1 to 5% by weight of CaO, and 0.3 to 0.8% by weight of Sb.sub.2 O.sub.3.

REFERENCES:
patent: 4002482 (1977-01-01), Coenen
patent: 4562161 (1985-12-01), Mennemann et al.
patent: 4732794 (1988-03-01), Hyde

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