... powder high quality As the largest manufacturer, our chemicals are sold to Europe, America, Asia, Africa and so on. FOR our good quality and ... 0.001 max0.00150.0020NH3 0.30 max0.500.70Heavy Metal(Pb) 0.001--------5.Usage:Boric acid is used ... fertilizers. Boric acid is produced diboride matrix material, and its metal welding, leather, precious stones, electronics, defense and scientific research ...