murphyAcrylates/Steareth-20 Methacrylate Crosspolymer
molecular structure · PubChem
AKA: Acrylic copolymer, Film-forming polymer
Plant-Derived
Occlusive
Not Clean
OriginSynthesized from acrylic acid, methacrylic acid, and steareth-20 methacrylate monomers derived from petrochemical sources. Produced through free radical polymerization and crosslinking with allyl ethers of pentaerythritol or trimethylolpropane.
Acrylates/Steareth-20 Methacrylate Crosspolymer is a copolymer of steareth-20 methacrylate and one or more monomers consisting of acrylic acid, methacrylic acid or one of their simple esters, crosslinked with an allyl ether of pentaerythritol or an allyl ether of trimethylolpropane
CAS #
-
Form
Liquid
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
The paper trail
🔬Peer-reviewednone on file
⚖️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
1 study / 1 not irritating (CIR 583)
Not a Sensitizer
1 study / 1 not sensitizing (CIR 583)
Concentration Guide
Leave-on2.3%
Rinse-off0.37–1.6%
0%50%100%
CIR reported use · 2018 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR