Packing: In PP woven bag lined with PE bag; paper-plastic composite bag, and kraft paper bag detail specification as follows: Specification:

Food grade: NaHSO3 ≥ 99%  Insol. in water ≤0.03 %  Iron(Fe) ≤0.005 % 

Heavy metal(Pb)≤0.001%  Arsenic(As) ≤ 0.0001%   Clarity test:quolified

Tech grade: NaHSO3 ≥ 98%  Insol. in water ≤0.05 %   Clarity test:quolified