murphyAdipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer
molecular structure · PubChem
AKA: Polyester polymer, Film former
Synthetic
Occlusive
Acid
Clean
OriginSynthesized from adipic acid, neopentyl glycol, and trimellitic anhydride monomers from petrochemical sources. Produced through polycondensation reaction combining these three components to form a crosslinked copolymer.
Hexanedioic acid, polymer with 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid and 2,2-dimethyl-1,3-propanediol
CAS #
28407-73-0
Form
Powder
State
Solid
Skin Types
●all-skin-types, gentle
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
Antioxidant 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
1
CIR
Insufficient data
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing (CIR 701)
Not a Skin Irritant
1 study / 1 not irritating (CIR 701)
Concentration Guide
Leave-on5.4–32.8%
Rinse-offNot reported
0%50%100%
CIR reported use · report published 2020
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR