Characteristic: Physical Appearance Assay as Na2S2O5 Assay as SO2% Ph of 10% solution Clarity of 10% soln. Specification: Iron content Heavy metals Arsenic Water insoluble White to off white powder 95 % min 65% 4 to 5.5 clear & colourless 5 PPM max 10 ppm max 10 ppm max 0.05% max Application: Leather treatment, agro industry, photograph, specialty chemicals Dye & intermediates, effluent treatment, metal cleaning chemical, food preservatives, pharmaceutical industry, laboratory chemicals. Oil field chemicals, paper mills, photography.
