Sodium Metabisulfite has two kinds of the specification Food Grade and Tech Grade. Specification: COMMODITY SPECIFICATIONS SODIUM METABISULPHITE TEST RESULT SODIUM METABISULPHITE APPEARANCE White or light yellow crystalline powderWhite or light yellow crystalline powderNa2S2O5% ≥ 96.0% 97.75% SO2% ≥ 65.0% 65.50% Fe% ≤ 0.005% 0.0029% Pb% ≤ 0.002% 0.001% Water-Insoluble% ≤ 0.05% 0.01% As% ≤ 0.0002% <0.0001% PH VALUE 4.0-4.6 4.5 QUANTITY/WEIGHT DECLRED CERTIFICATED Granular size: 80% between 0.1mm-0.2mm Bulk density: 1.2-1.3kg/dm3 Packing: In 25kg poly woven bags Loading: 25MT/20'FCL