Methyl methacrylate crosspolymer
AKA: Polymethyl methacrylate, PMMA, Acrylic polymer
Synthetic
Occlusive
Clean
2-Propenoic acid, 2-methyl-, 1,2-ethanediyl ester, polymer with methyl 2-methyl-2-propenoate
CAS #
25777-71-3
Form
Liquid
State
Solid
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
Fights Bacteria
Traditional Use
A synthetic polymer developed for industrial and cosmetic applications in the latter half of the 20th century. Used in cosmetics as a film-forming and suspending agent to improve product texture and adherence.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Caution
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.
Verified Jun 2026
Data: CosIng · EWG · CIR