murphyPolyethylene Terephthalate
AKA: PET, Polyethylene terephthalate resin
Synthetic
Occlusive
Clean
OriginProduced from ethylene glycol and terephthalic acid, both petroleum-derived chemicals from the aromatic hydrocarbon family. Synthesized through polycondensation esterification, where the two monomers chemically bond under heat and catalytic conditions.
Poly(oxy-1,2-ethanediyloxycarbonyl-1,4-phenylenecarbonyl)
CAS #
25038-59-9
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Creates Protective Barrier
Locks In Moisture
Fights Bacteria
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 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
2 studies / 2 not irritating (CIR 629)
Not a Sensitizer
6 studies / 6 not sensitizing (CIR 629)
Not a Skin Irritant
2 studies / 2 not irritating (CIR 629)
Concentration Guide
Leave-on0.005–100%
Rinse-off0.05–2%
0%50%100%
CIR reported use · report published 2014
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR