... delivery-Good quality-Best service and Good reputation-All the inspections such as BV, SGS, ISO9001.Usage: ... Primarily used as the filler of dyes and auxiliaries agents, and as the accelerating agent of direct dyes, sulfur dyes ... , synthetic fiber, leather and other industries. CERTIFICATE OF ANALYSIS ITEMSSTANDARDRESULTSNa2So4 %≥99.00%99.21%FE%≤0.002 ... %min PH:9-11;SGS ,BV;HS Code :2833110000