... for metal surface of phosphate in black... 3.Phosphate P2O5, 46-52% 1>Chemical Name: Zinc phosphate monobasic2>Molecular Formula: Zn ... as colorants, clarifying agent used in glass industry etcItemindexPhosphate P2O5,%46-52ZincZn, % ≥ 19.5Free acid H3PO4,% ≤ 5.0sulphate SO42,% ≤0.05lead ...