High purity inorganic chemicals for the pharmaceutical, aerospace, R&D, and electronic industries.

  Barker Reinvents the Possible

Sodium Thiosulfate Pentahydrate, Reagent, A.C.S.


Assay: ≥99.5%
Na2S2O3 · 5H2O
Assay: 99.5-101.0%
pH of a 5% soln. at 25°C:   6.0 – 8.4
Insoluble Matter: 0.005% maximum allowable
Nitrogen compounds: 0.002% maximum allowable
Sulfate and Sulfite: 0.1% maximum allowable
Sulfide: passes test