murphyPolymethyl Methacrylate
molecular structure · PubChem
Plant-Derived Synthetic
Occlusive
Not Clean
OriginDerived from methyl methacrylate monomers, typically produced from petrochemical sources or bio-based feedstocks. Synthesized through free radical polymerization of methyl methacrylate monomers to form the final polymer compound.
2-Propenoic acid, 2-methyl-, methyl ester, homopolymer
CAS #
9011-14-7
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
UV Protection
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
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
3 studies / 3 not irritating (CIR 468 and 763)
Not a Sensitizer
2 studies / 2 not sensitizing (CIR 763)
Mixed Eye Irritation Results
2 studies / 1 irritating / 1 not irritating / reactions slight (CIR 468 and 763)
Concentration Guide
Leave-on0.0036–44.6%
Rinse-off0.009–15.6%
0%50%100%
CIR reported use · 2018 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR