murphyPPG-40 Butyl Ether
molecular structure · PubChem
AKA: Polypropylene Glycol-40 Butyl Ether, PPG Butyl Ether
Synthetic
Skin Conditioner
Hair Care
Clean
OriginPPG-40 Butyl Ether is synthesized from propylene glycol and butanol through polymerization and etherification reactions. It is produced by reacting propylene oxide with butyl alcohol under catalytic conditions to form the polymer ether.
Polyoxypropylene (40) 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-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not an Eye Irritant
1 study / 1 not irritating (CIR 300)
Not a Sensitizer
3 studies / 3 not sensitizing (CIR 300 and 726)
Mixed Skin Irritation Results
2 studies / 1 irritating / 1 not irritating / reactions minimal (CIR 300)
Concentration Guide
Leave-on0.75–71%
Rinse-off2–73.5%
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR