... orthoboric acid or acidum boricum, is a weak acid often used as an antiseptic, insecticide,flame retardant and a precursor of ... .70Heavy Metal(Pb) 0.001--------5.Usage:Boric acid is used extensively for the glass industry, in particular E-glass fibers, but ... . In the enamel, ceramic industry, products used to enhance the gloss and fastness. Can be used for medicine and wood preservation. Fungicides can ...