Styrene/Methylstyrene Copolymer
AKA “Styrene-Methylstyrene Copolymer”
Ingredient
Ingredient Facts
Styrene/methylstyrene copolymer
AKA: Styrene-Methylstyrene Copolymer
Ingredient · Binding · EWG: 4
Synthetic
Not Clean
Ethenyl-benzene and (1-methyl-ethenyl) benzene copolymer
CAS #
9011-11-4, 37218-15-8
Form
Liquid
State
Solid
See origin →
Functions
Binding
Depilatory
Holds Formula Together
Removes unwanted hair
Holds ingredients together
Traditional Use
A modern synthetic polymer developed in the late 20th century for cosmetic applications as a film-forming and thickening agent. Created through petroleum-derived polymer chemistry.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
4
CIR
Safe as used
Pregnancy
Caution
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR