Styrene/Methylstyrene Copolymer

Styrene/Methylstyrene Copolymer 1
AKA: Styrene-Methylstyrene Copolymer
Synthetic
Not Clean
Ethenyl-benzene and (1-methyl-ethenyl) benzene copolymer
CAS #
9011-11-4, 37218-15-8
Form
Liquid
State
Solid
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.
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
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