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Sodium hydroxide
No.  Testing item      Analytically pure (Second grade) Chemically pure(third grade)
1     Content (NaOH),%      ≥96.0   ≥95.0
2     Content(?Na2CO3?),% ≤1.5   ≤3.0
3     Clearance test    Qualified      Qualified
4     Chlorine (Cl),%    0.005     0.01
5     Sulfate (SO4),%   0.005     0.02
6     Total nitrogen(N),%       0.001    0.002
7     Phosphorus acid salt (PO4),%   0.001    0.002
8     Silicate(SiO3),%     0.01     0.05
9       (Al),%         0.002     0.005
10     (K),%          0.05 --------
11      (Ca),%         0.01      0.05
12     (Fe),%         0.001     0.002
13    Heavy metal (Pb),%  0.003    0.003