... BV, SGS, ISO9001.Usage: Depilatory for hides and skins, manufacture of rubber,sulphur dyes, rayon (denitrating), paperpulp, ore floatation, metal ... , cotton ,printing, as chemical intermediates and laboratory reagent. CERTIFICATE OF ANALYSIS ITEMSSTANDARDRESULTSPURITY(Na2S)≥60.00%61%Na2CO3≤2%1.3 ... %Fe%0.04%0.025% Sodium Sulfide 60% Red Flakes Used in leather industry / Fe :1500 PPM;CAS:1313-82-2 ( ...