Enamel frits for acid-resistant one-coat enamellings on unpickled steels

Abstract From the Canadian patent

An enamel frit for producing an acid-resistant enamelled steel in a single coating comprising at least about 40 % of silicon atoms, 50 % of silicon atoms and boron atoms, where the proportion of the boron atoms should not fall below 6.5 %, 63 % of silicon atoms boron atoms and sodium atoms, where the proportion of the sodium atoms should not fall below 7.5 % each, relative to the overall total of the non-oxygen atoms in the frit, the proportion of the remaining non-oxygen atoms being less than about 37 %, and 1.0 to 1.2 % of cobalt atoms. In addition, there are (1) x fluorine atoms with 1 % ? x ?11 % and at least y lithium atoms and at most 2 y lithium atoms with y = (15/x) + 5 being …