Product Description Sodium thiosulfate pentahydrate, ACS reagent Other Details Molecular Formula: Na2S2O3.5H2O Molecular Weight: 248.18 CAS Number: 10102-17-7 Minimum Purity: 99.5 - 101.0% UN Number: 0 Dangerous Goods Class: 0 Packing Group: 0 Storage Temperature: 0 Sizes 1: 25g Leadtime:20 Days Sizes 2: 100g Leadtime:20 Days Sizes 3: 500g Leadtime:20 Days