... industrial grade 4.85%,80%,75% content 5.for fertilizer,metal cleaner phosphoric acid p2o5 grade: Industrial Grade (85% 80 ... for phosphate, fertilizer, alum timber’s polishing compound, phosphating, metal cleaning agent, organic synthesis catalyst, it is the desiccant during producing ... As) mass fraction % ≤ 0.00010.0050.010.00010.0050.01heavy metal (Pb) mass fraction % ≤0.0010.0010.050.0010.0010. ...