(Specially purified material free from halide and 100 gm Sulphate reagent for ion-pair formation for HPLC and standard for surfactant studies) C7H15NaO3S.H2O M.W. 220.24 Assay min 99% Transmission(0.005 mol/L) Wave length in nm : 200 220 250 Min. Transmission : 70.0% 90.0% 98.0%