Nickel-Free And Chromium-Free Forehearth Colors For Glass Tanks

摘要

The invention relates to the field of forehearth frits, pearls, and/or concentrates for use in glass compositions. In particular, the present invention provides a system of forehearth frits, pearls, and/or concentrates that is capable of imparting a brown color to a glass composition for forming colored glass in the forehearth of a glass furnace, and a method of using the colored system of forehearth frits, pearls, and/or concentrates. The invention further provides a glass composition for use in forming the color system or for use directly in a forehearth.

主权项

1. A color glass frit free of nickel and chromium, the frit comprising in weight %:
from about 30 to about 50% SiO2, from about 15 to about 30% Na2O, from about 1 to about 10% B2O3, from about 10 to about 30% Fe2O3, from about 0.1 to about 5% ZnO, from about 0.1 to about 5% Al2O3, from about 0.1 to about 5% CuO, from about 0.01 to about 1% CoO, from about 0.1 to about 5% Se; from about 1 to about 8% SnO/SnO2, no nickel and no chromium.