Properties Typical Values Appearance Clear uniform white granules free of foreign matter Assay as K2B4O7.4H2O 99.50 % min. B2O3 45.10 % min. K2O 30.30 % min. Insoluble Matter 0.01 % max. Chloride (Cl) 0.005 % max. Sulphate (SO4) 0.02 % max. Heavy Metals as Pb 0.005 % max. Iron (Fe) 0.001 % max. Calcium Magnesium Precipitate 0.01 % max. Particle Size : +8 mesh 0.1 % max. Particle Size : +30 mesh 1 % max. Particle Size : +170 mesh 80 % min.
