Sodium Hydroxide

EP/NF + LEC + Microbiological requirements

CAS #:


Molecular Formula:



Caustic Soda, Soda Lye

Molecular Weight:

40.00 g/mol


Sodium Hydroxide is an inorganic compound and caustic metallic base and alkali salt. It typically comes in flakes, pellets, and granules. It is soluble in ethanol, water and methanol and is deliquescent, readily absorbing carbon dioxide and moisture in air. Sodium hydroxide is also known as caustic soda and used in industries typically as a strong chemical base in order to produce paper and pulp, as well as some detergents and drain cleaners.

Characters Unit Specification
Identity A ( EP,BP) Acc. To Requirements
Identity B (EP, BP) Acc. To Requirements
Identity A (USP) Acc. To Requirements
Appearance of solution (EP,BP) Correlates to test.
Potassium (USP) Correlates to test.
Insol. Subst. and org. matter NF Correlates to test.
Assay (EP, BP) % 97,0 -100,5
Assay (EP, BP) % 95,0 - 100,5
Carbonate (EP/BP) mg/kg <= 20000
Carbonate (USP) mg/kg <= 30000
Heavy metals (as Pb) mg/kg <= 20
Sulphates mg/kg <= 200
Iron mg/kg <= 10
Chlorides mg/kg <= 200
Bacterial endotoxines IU/g <= 5
TAMC 30 ° C (Total aerobic microbial count) CFU/g <= 50
TYMC CFU/g <= 10
Escherichia coli CFU/g
Staphylococcus aureus CFU/g
pseudomonas aeruginosa CFU/g
salmonella CFU/10 g

Shelf Life/Retest Date: Sodium Hydroxide CAS NO. 1310-73-2 can be kept for at least 3 years if stored in a cool and dry place.

Storage/Shipping Conditions:

  • Keep container tightly closed in a cool, well-ventilated place.
  • Storage temperature recommended: < 25°C

Pack Sizes: 5 Kg

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