... sight high grade boric acid powder/granular 99.5% Introduction of ourselves:Zhengzhou P&B Chemical Co ... metallurgical industry, fire-proofing compositions and linings for safes; 5)Also for pigments; Enamel paints, paper glazes, cosmetics ... 6-99.8%99.3-99.4%99.0%Water Insoluble0.01max0.040.06Sulfate0.1max0.20. ... 001max0.00150.002NH30.3max0.50.7Heavy Metal(Pb)0.001------Packing of boric acid granular In ...