Specification :

Molecular Formula: Na2S2O3
Molar Mass: 158.09774 g/ mol
Appearance: white crystals
Uses: used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent, as a blush preventive agent, and as a disinfectant. and decolor agent.

Tech grade specification:
Na2S2O3· 5H2O: 98.5% min
Water-insoluble : 0.01% max
Density and phase: 1.667 g/ cm³ , solid
Melting point: : 40-45 ° C
Sulphide( as Na2S) : 0.003% max
Fe: 0.003% max
PH Value( 200g/ l solution) : 6.5-9.5