... wood preservative, for water treatment, as a flame retardant additive.1.Industry GradeAppearance:White CrystalsAssay,% 99.0MINChlorides,% 0.2 MAXSulphates, PPM 200 MAXLoss ... MAXSulphates, PPM 100 MAXLoss on Drying,% 0.5 MAXHeavy Metal(As Pb,Hg)PPM 5.0 MAXArsenic, PPM 4.0 MAXVolatile,% ... Hg)PPM 3.0 MAXArsenic, PPM 4.0 MAXVolatile,% 0.5 MAXBromates, PPM 10 MAXIodide, PPM 50 MAXMinor Elements, PPM 0 ...