1,4-Butanediol/Succinic Acid/Adipic Acid/HDI Copolymer

AKA: Polyester Copolymer

Synthetic

Occlusive

Acid

Not Clean

Hexanedioic acid, polymer with butanedioic acid, 1,4-butanediol and 1,6-diisocyanatohexane

CAS #

119553-67-2

State

Solid

Functions

Abrasive

Binding

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Physical Exfoliant

Holds Formula Together

Creates Protective Barrier

Gently polishes surface

Creates protective layer

Holds ingredients together

Traditional Use

A modern synthetic polymer developed for the cosmetics industry to create film-forming and conditioning properties. This complex copolymer was engineered to provide benefits not achievable with traditional natural ingredients.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

Verified Jun 2026

Data: CosIng · EWG · CIR