murphyPPG-33 Butyl Ether
molecular structure · PubChem
AKA: Polypropylene Glycol-33 Butyl Ether, PPG Humectant
Synthetic
Skin Conditioner
Hair Care
Not Clean
OriginSynthesized from propylene glycol and butanol through polymerization reactions in controlled laboratory conditions. Produced via ether linkage formation between propylene glycol units and butyl alcohol under catalytic conditions.
Polyoxypropylene (33) butyl ether
CAS #
9003-13-8
Form
Liquid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed0 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Mixed Eye Irritation Results
3 studies / 1 irritating / 2 not irritating (CIR 300 and 726)
Mixed Skin Irritation Results
4 studies / 1 irritating / 3 not irritating / reactions slight (CIR 300 and 726)
Concentration Guide
Leave-on1–10%
Rinse-offNot reported
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR