Ammonium Acrylates/Methylstyrene/Styrene Copolymer
AKA “Acrylic Polymer, Film Forming Polymer
Synthetic
Ingredient Facts
Ammonium acrylates/methylstyrene/styrene copolymer
AKA: Acrylic Polymer, Film Forming Polymer
Synthetic · Film Forming · EWG: 4
Synthetic
Occlusive
Synthetic
Clean
Ammonium Acrylates/Methyl Styrene/Styrene Copolymer is a copolymer consisting of ammonium acrylate, methyl styrene and styrene monomers; Ammonium 2-propenoate, polymer with (1-methylethenyl)benzene and ethenylbenzene Science: Functions: Film Forming Safety Ratings: CIR: Safe as used
CAS #
-
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.
Viscosity Controlling
Binder
Waterproofing Agent
Creates Protective Barrier
Reduces Inflammation
Locks In Moisture
Traditional Use
A synthetic terpolymer developed in the late 20th century for use in hair and skincare products as a film-forming and suspending agent. Created specifically for modern cosmetic applications with no traditional use.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe w/Qualifications
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR