Properties Typical Values Appearance Clear uniform white powder free of foreign matter Assay as KB5O8.4H2O 99.4 % - 101.1 % min. B2O3 59.0 % - 60.0 % min. K2O 15.9 % - 17.0 % min. Sodium as Na 1000 ppm max. Chloride as Cl 500 ppm max. Sulphate as SO4 500 ppm max. Iron as Fe 20 ppm max. Particle Size : +70 mesh 8.0 % max.
