At a glance
- CAS number
- 102-71-6
- INCI name
- Triethanolamine
- Function
- ph_adjuster, emulsifier, surfactant, chelator
- Typical use level
- 0.1%–2.5%
- Solubility
- water
- Stable pH
- 7–11
CAS number and synonyms are sourced from PubChem. Function, usage levels, pH and compatibility are AI-assisted formulation guidance — verify against your supplier's technical data sheet and applicable regulations before use.
Also known as
Trolamine 2,2',2''-Nitrilotriethanol Sterolamide Daltogen Tris(2-hydroxyethyl)amine Nitrilotriethanol Triethylolamine Trihydroxytriethylamine Thiofaco T-35 Sting-Kill Triethanolamin Tri(hydroxyethyl)amine
Compatibility
Works well with:
Carbomer Acrylates Copolymer Xanthan Gum Glycerin Niacinamide Hyaluronic Acid Fatty Acids
Use caution with:
L-Ascorbic Acid AHA Acids Salicylic Acid Strong Mineral Acids Oxidizing Agents Copper Salts Iron Salts
TEA is a strong base and will neutralize acidic actives such as L-Ascorbic Acid, AHAs, and BHAs, rendering them ineffective and causing pH incompatibility. It can form nitrosamines in the presence of nitrosating agents or certain preservative systems, which is a key safety concern. Heavy metal ions (copper, iron) can catalyze its degradation and discoloration.
Formulation notes
EU Cosmetics Regulation restricts TEA to a maximum of 2.5% in rinse-off products and 0.5% in leave-on products; products must have a minimum purity of 99% to limit diethanolamine content. Nitrosamine formation risk requires avoidance of nitrosating co-ingredients. Patch sensitivity may occur in some individuals. Increasingly being replaced by safer neutralizers such as Sodium Hydroxide or Aminomethyl Propanol in modern formulations.
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