Sodium Metabisulphite
Uses
Photographic chemical and preservative chemicalTechnical Detail
Product name Sodium Metabisulphite - Na2S2O5
Molecular Weight 190.10
Description White crystalline powder, free from extraneous
matter with a faint odour of sulphur dioxide gas.
Assay as (Na2S2O5) 95 % Min
Assay as (SO2) 64 % Min
Solubility (20 % Aqueous Soln) Perfectly clear & Colourless
pH Value of 5% Solution 4 ± 0.5
Iron (As Fe) percent by Mass 0.005 % Max
Heavy metals (as Pb) Percent by mass 0.005 % Max



Photographic chemical; Pharmaceutical chemical; laboratory reagent and in
dyes.