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Used in papermaking, soap, dyes, rayon, aluminum, petroleum refining, cotton fabric finishing, purification of coal tar products, as well as food processing, wood processing and machinery industry.

Index

①32% sodium hydroxide solution index:

Item	Premium	First grade
Content≥%	32	32
Sodium carbonate ≤	0.04	0.06
Sodium chloride≤	0.004	0.007
Ferric oxide≤	0.0003	0.0005
Sodium chlorate≤	0.001	0.002
Calcium Oxide≤	0.0001	0.0005
Aluminum Dioxide≤	0.0004	0.0006
Silica≤	0.0015	0.003
Sodium sulfate≤	0.001	0.002

②48% sodium hydroxide solution index:

Item	Premium	First grade	合格品
Content≥%	48	48	48
Sodium carbonate≤	0.1	0.2	0.2
Sodium chloride≤	0.007	0.01	0.01
Ferric oxide≤	0.0005	0.0007	0.001
Sodium chlorate≤	0.002	0.003	0.003
Calcium Oxide≤	0.0003	0.0008	0.0008
Aluminum Dioxide≤	0.001	0.002	0.002
Silica≤	0.002	0.003	0.003
Sodium sulfate≤	0.002	0.003	0.003

③98% industrial flake sodium hydroxide index:

Item	Standard value
Appearance	White flake solid
Content≥%	98.0
Sodium carbonate≤%	0.8
Sodium chloride≤%	0.05
Ferric oxide≤%	0.008

④Indices of food additive sodium hydroxide:

Item	Standard value
Appearance	White flakes, allowing micro-strip color
Total alkali	98.0-100
Sodium carbonate≤%	2.0
Arsenic，≤%	3.0
Heavy metal，≤%	5
Hg，≤	0.1
Insoluble matter and organic impurities	Pass the test

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