... pesticides, and trace element fertilizers, boric acid white crystalline powder specification : ItemIndicatorsExcellent productFirst-class productQualifiedboric acid(H3BO3) 99 ... ≤0.0010.00150.0020NH3 ≤ 0.300.500.70Heavy Metal(Pb) ≤0.001-------- Uses: 2, In the enamel ... Boric acid is produced diboride matrix material, and its metal welding, leather, precious stones, electronics, defense and scientific ...