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Ammonium Styrene/Acrylates Copolymer
AKA “Styrene acrylate copolymer ammonium salt”
Ingredient
Ingredient Facts
Ammonium styrene/acrylates copolymer
AKA: Styrene acrylate copolymer ammonium salt
Ingredient · Film Forming · EWG: 2
Synthetic
Occlusive
Clean
Ethenylbenzene, polymer with 2-propenoic acid, 2-methyl-2-propenoic acid and/or one of their simple esters, ammonium salts
Form
Liquid
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.
Opacifying
Creates Protective Barrier
Adds Opacity
Reduces Inflammation
Locks In Moisture
Creates protective layer
Creates creamy opacity
Traditional Use
A synthetic polymer developed in the mid-20th century. Used in cosmetics as a film-former and thickening agent with no traditional precedent.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-2
medical-approval
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR