ENAMEL Russian patent published in 1995 - IPC

FIELD: enamels. SUBSTANCE: enamel has, wt.-% silicon oxide SiO₂ 38-40; aluminium oxide Al₂O₃ 3-5; boron oxide B₂O₃ 16-18; sodium oxide Na₂O 18-20; potassium oxide K₂O 2.1-3.5; titanium oxide TiO₂ 3-5; phosphorus pentoxide P₂O₅ 1-3; zirconium oxide ZrO₂ 4-6; calcium oxide (CaO) 3-5; cobalt oxide Co₂O₃ 0.3-0.7; magnesium oxide (MgO) 0.6-1.5; lithium oxide Li₂O 1-2, and zinc oxide (ZnO) 1-4. Properties of enamel coating: roasting temperature is 750-800 C, impact strength is 2.5-3.0 J, chemical resistance after exposition in NaOH solution (concentration is 40 g/l) for 48 h at 80 C is absent. Product is used for enameling of domestic apparatus. EFFECT: enhanced quality of enamel. 2 tbl