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- Synonyms: Caustic soda
- NaOH
- M = 40,00 g/mol
- CAS [1310-73-2]
- EINECS-No.: 215-185-5
- Solub. in water: (20 ºC): soluble
- Melting point: 315 ºC
- Boiling point: 410 ºC
- EC-Index-No.: 011-002-00-6
- ADR: 8 C6 II UN 1823
- IMDG: 8 II UN 1823
- IATA/ICAO: 8 II UN 1823
- GHS-signal word: Danger
- GHS-H sentences: H314
- GHS-P sentences: P260 - P303+P361+P353 - P305+P351+P338 - P310 - P405 - P501a
- Tariff number: 2815 11 00 00
- Applications: solutions: to neutralize acids, to make sodium salts, to precipitate metals (as hydroxides) from water solutions of their salts.

SPECIFICATIONS
assay (acidimetric): min. 98,5 %
identity: passes test
appearance of solution: passes test
carbonates (as Na2CO3): max. 1,0 %
chlorides (Cl): max. 0,001 %
phosphates (as PO4): max. 5 ppm
silicates (SiO2): max. 0,001 %
sulfates (SO4): max. 5 ppm
ammonium hydroxide precipitate: max. 0,02 %
total nitrogen (as N): max. 0,001 %
aluminium (Al): max. 5 ppm
arsenic (As): max. 1 ppm
calcium (Ca): max. 0,001 %
copper (Cu): max. 5 ppm
heavy metals (as Ag): max. 0,002 %
iron (Fe): max. 5 ppm
lead (Pb): max. 2 ppm
magnesium (Mg): max. 5 ppm
mercury (Hg): max. 0,1 ppm
nickel (Ni): max. 5 ppm
potassium (K): max. 0,02 %
zinc (Zn): max. 0,001 %