ENAMEL Russian patent published in 1995 - IPC

FIELD: building materials. SUBSTANCE: brown color enamel has, wt.-%: silicon oxide 47-50; titanium oxide 6-8; boron oxide 13-16; aluminium oxide 4-6; ferric oxide 4-7; chrome oxide 1.5-3; magnesium oxide 0.1-0.5; calcium oxide 1-3; sodium oxide 13-16, and potassium oxide 0.1-0.5. Enamel properties: roasting temperature is 820-860 C, corrosion stability is 0,11-0,14 mg/cm²·h, boron leaching is 0,6-0,8 mg/dm³, iron leaching is 0,3 mg/dm³, chrome and zinc leaching - absent. EFFECT: enhanced quality of enamel. 1 tbl