undefined 1
Methylstyrene/Vinyltoluene Copolymer
AKA “Copolymer resin”
Ingredient
Make this about you

Tap what applies — every card instantly flags it for you. Stays on your device, syncs if you're signed in.

Ingredient Facts
Methylstyrene/vinyltoluene copolymer
AKA: Copolymer resin
Ingredient · Viscosity Controlling · EWG: 1
Synthetic
Clean
Benzene, ethenylmethyl-, polymer with (1-methylethenyl)benzene
CAS #
9017-27-0
Form
Liquid
State
Solid
See origin →
Functions
Viscosity Controlling
Controls Viscosity
Traditional Use
A synthetic polymer developed in the mid-20th century for use in cosmetics, particularly in hair styling products and nail polish. Created to provide film-forming and holding properties.
Skin Types
●all-skin-types
Best For
General
EWG
1
CIR
Safe as used
Pregnancy
—
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR