C9-11 Pareth-4

C9-11 Pareth-4 molecular structure
molecular structure · PubChem
AKA: Nonionic Surfactant
Synthetic
Cleanser
Emulsifier
Not Clean
C9-11 Pareth-4 is a polyethylene glycol ether of a mixture of synthetic C9-11 fatty alcohols with an average of 4 moles of ethylene oxide
CAS #
-
Form
Liquid
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 surfactant derived from ethoxylated isoparaffin, developed in the mid-20th century. Used as a mild cleanser and emulsifier in personal care products.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR