Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer
AKA “Polyester polymer, Film former
Acid
Ingredient Facts
Adipic acid/neopentyl glycol/trimellitic anhydride copolymer
AKA: Polyester polymer, Film former
Acid · Film Forming · EWG: 1
Synthetic
Occlusive
Acid
Clean
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
See origin →
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
Traditional Use
A synthetic polymer created through modern chemical synthesis in the late 20th century. Designed as a cosmetic film-former and binding agent for improved product performance.
Skin Types
all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Insufficient data
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR