Stearoxypropyltrimonium Chloride

AKA: Quartamin E-80k, 23328-71-4, 1-Propanaminium, Chloride (1:1), 3-Octadecyloxypropyltrimethylammonium chloride, Stearoxypropyltrimonium chloride [INCI], Ammonium

Plant-Derived

Cleanser

Skin Conditioner

Hair Care

Not Clean

OriginDerived from stearyl alcohol and trimethylamine, which are obtained from animal fats or vegetable oils. Synthesized through quaternization, where trimethylamine is chemically bonded to stearoxypropyltrimonium chloride backbone.

Ammonium, Trimethyl[3-Octadecyloxy)Propyl]-, Chloride

Formula

C24H52ClNO

Mol. Weight

406.10

CAS #

23328-71-4

Form

Liquid

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

Functions

Cleansing

Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.

Hair Conditioning

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

Cleansing

Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.

Removes Impurities

Conditions Hair

Cleansing Surfactant

Removes dirt and impurities

Lifts away dirt and oil

Softens and detangles hair

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

EWG

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

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Verified Jun 2026

Data: PubChem · CosIng · EWG · CIR