NaCl M.W. 58.44 5 kg Assay(after ignition) min 99.5% Identity passe test Appearance of solution passes test Acididty or alkalinity passes test pH of 5% solution 5.0-8.0 Insoluble matter max 0.005% Bromide (Br) max 0.005% Iodide(I) max 0.001% Ferrocyanide(Fe(CN)6) max 0.0001% Chlorate & Nitrate(NO3) max 0.003% Nitrite (NO2) passes test Phosphate(PO4) max 0.0005% Sulphate(SO4) max 0.001% Total Nitrogen max 0.0005% Heavy metals (as Pb) max 0.0005% Arsenic(As) max 0.00004% Barium(Ba) max 0.001% Calcium(Ca) max 0.002% Copper(Cu) max 0 .0002% Iron(Fe) max 0.0002% Magnesium(Mg) max 0.001% metals (as Ca) max 0.01% Potassium(K) max 0.005%