... Sulfate (SO4) content,% ≤ 0.003 0.005 0.01 Iron (Fe) content,% ≤ 0.002 0.002 0.005Arsenic (As) content,% ... antirust paintSpecifications1.Industrial grade:chemical fertilizer,detergent additive 2.Food grade:food additive 3.Medicine grade;glycerin manufacturingphosphoric acidQuick DetailsFormula: ... Sulfate (SO4) content,% ≤ 0.003 0.005 0.01 Iron (Fe) content,% ≤ 0.002 0.002 0.005Arsenic (As) content,% ...