Adipic Acid/1,4-Butanediol/Terephthalate Copolymer
AKA “Polyester polymer, Film former
Acid
Ingredient Facts
Adipic acid/1,4-butanediol/terephthalate copolymer
AKA: Polyester polymer, Film former
Acid · Skin Conditioning · EWG: 4
Synthetic
Skin Conditioner
Acid
Not Clean
Adipic Acid/1,4-Butanediol/Terephthalate Copolymer is a cosmetic ingredient. Assessed as safe by the CIR.
Form
Powder
State
Solid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Stabilizes pH
Masks Odor
Antioxidant Protection
Fights Bacteria
Provides antioxidant protection
Helps fight skin
Damaging bacteria
Creates smooth skin texture
Traditional Use
A synthetic polymer created in the late 20th century through chemical engineering. Designed to function as a film-former and binder in modern cosmetic formulations.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not an Irritant
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR