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Sodium Hydroxide
AKA “Caustic soda, Sodium hydrate, Aetznatron, Soda lye, White caustic, Soda, caustic, Natriumhydroxid”
Synthetic
Ingredient Facts
Sodium hydroxide
AKA: Caustic soda, Sodium hydrate, Aetznatron, Soda lye, White caustic, Soda, Caustic, Natriumhydroxid
Synthetic · Buffer · EWG: 3
Synthetic
Solvent
Synthetic
Clean
Helps balance and stabilize the formula to ensure consistent texture and performance in your product.
Solubility 111 % (NIOSH, 2024)
Formula
HNaO
Mol. Weight
40.00
CAS #
1310-73-2
Form
Powder
State
Sodium hydroxide solution appears as a colorless liquid. More dense than water. Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion. Corrosive to metals and tissue.
See origin →
Functions
Buffer
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Stabilizes pH
Makes Alcohol Undrinkable
Traditional Use
This ingredient name is incomplete and cannot be identified without further specification. PELLETS is a physical form descriptor rather than a specific ingredient with historical use.
Melanin-Rich Skin
Suitable
EWG
3
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Concentration Guide
5.0%
0%7%
Reg. Limit
EU regulatory limit: 5.0%. (a) 5% (5) (b) 1. 2% (5) 2. 4.5% (5). (a) Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children (b) 1. Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children 2. F... Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 15a.
Regulatory Status
USAunder review
CANADA✔ permitted
Regulatory Agencies
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Dream Set
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Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR