Assay:                               99% min.   

Water insolubles:            0.01% max.      

Na2S:                             0.001% max.     

Fe:                                  0.002% max.    

Particle size(grain/gram):      12-16          

Ph:                                     6.5—9.5  

Packing,25kg 500kg bag

Sodium thiosulfate Pentahydrate