Trideceth-2
molecular structure · PubChem
AKA: Ethanol, DIETHYLENE GLYCOL MONOTRIDECYL ETHER, MARLIPAL O 13/20, NOVEL TDA-2 ETHOXYLATE, ALFONIC TDA-2 ETHOXYLATE
Synthetic
Cleanser
Emulsifier
Clean
Poly(oxy-1,2-ethanediyl), .alpha.-tridecyl-.omega.-hydroxy- (2 mol EO average molar ratio); Isotridecanol, ethoxylated
Effective at 1.6%
Formula
C17H36O3
Mol. Weight
288.50
CAS #
24938-91-8, 69011-36-5
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Mixes Oil & Water
Traditional Use
Synthetic nonionic surfactant and emulsifier developed in the mid-20th century as part of the polyethylene glycol ether family. Created to replace natural emulsifiers in cosmetics and personal care products for improved stability and consistency.
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.2%
3.0%
0%4%
Reported use
CIR reported use: 0.7-2 | 1-3 | 0.2-3
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR