SODIUM HYDROXIDE (Sodium hydroxide) - Ingredient INCI Beauty

"No penalty" in the following categories :

Shaving soap, Solid soap, Baby solid soap, Solid shampoo

"Low penalty" in all other categories.

Origin(s): Synthetic
Other languages: Hidróxido de sodio, Hidróxido de sódio, Idrossido di sodio, Natriumhydroxid, Soude Caustique (Hydroxyde de Sodium)
INCI name: SODIUM HYDROXIDE
EINECS/ELINCS number: 215-185-5
Food additive: E524
Classification: Regulated
Bio-compatible (COSMOS Reference)

Namely Caustic soda is used in the preparation of many products (detergents, explosives ...). It is used to make sodium salts and to neutralize acids. In cosmetics, it allows the manufacture of solid soaps. Caustic soda is allowed in organic, it does not pose problems in the conditions of regulation.

Restriction in Europe: III/15a
The maximum amount of sodium hydroxide to be used in cosmetics is limited as follows:
a) Solvent nail cuticles: 5%.

b) Hair straightening products: 2% for general use and 4.5% for professional use.

c) pH regulator for depilatories: pH <12.7.

d) Other uses as pH regulator: pH <11.

Wording of conditions of employment and warnings:
a) Contains an alkaline agent
Avoid contact with the eyes
Danger of blindness
Keep out of reach of children

(b) In general use:
- Contains an alkaline agent
- Avoid contact with the eyes
- Danger of blindness
- Keep out of reach of children
b) In professional use:
- Reserved for professionals
- Avoid contact with the eyes
- Danger of blindness

c) Keep out of reach of children
Avoid contact with the eyes

Its functions (INCI)