Product specifications:
Chemical pure reference standard GB668-1978
Standard No.: Q/140000 XJD 003-2003 index value




Item  Chemical pure  Excellent grade  first grade  Qualified product

Ca (NO3) 2  4H2O
content,% ≥  99.0         99.0          99.0         98.0
material of insoluble
water content,% ≤ 0.01     0.05           0.1         0.2
Chloride (Cl)
content,% ≤   0.01          0.005         0.01        0.05
Sulphate (SO4)
content,% ≤    0.03          0.02          0.05        0.1
Iron (Fe)
content,% ≤  0.0005         0.02           0.05        0.1
Heavy metals (Pb)
content,% ≤   0.001          0.005         0.005       0.05
Alkali metal and magnesium (to Sulphate of)
content,% ≤     0.4           ----            ----          ----