Stearoyl Ethyltrimonium Methosulfate

AKA: Surfactive V 18, Stearoyl ethyltrimonium methosulfate [INCI], 114519-87-8, Ethanaminium, Methyl sulfate, Methyl sulfate (1:1)
Plant-Derived
Cleanser
Emulsifier
Not Clean
OriginDerived from plant-based fatty alcohols, typically obtained from coconut or palm kernel oils through hydrogenation. Synthesized through quaternization of stearoyl ethyltrimonium compounds with methyl sulfate.
The CIR Expert Panel concluded the following ingredients are safe in the present practices of use and concentration described in the safety assessment when formulated to be non-irritating...Stearoyl Ethyltrimonium Methosulfate...
Formula
C24H51NO6S
Mol. Weight
481.70
CAS #
-
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Surfactant Emulsifying
Antimicrobial
Fights Acne
Antioxidant
Mixes oil and water
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2012
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR