Decahydrate Borax (Na2B4O7.10H2O) CHEMICAL ANALYSIS Component Unit Content B2O3 % 36.47 min. Purity % 99.90 min. Na2O % 16.24 min. SO4 ppm 70 max. Cl ppm 50 max. Fe ppm 10 max. SIZE DISTRIBUTION Size (mm) Unit Content + 1.000 % 1.00 max. - 0.063 % 4.00 max. 50kg/bag 24Mton/20'FCL load without palletized 50kg/bag 24Mton/40'FCL load without palletized.