Polystyrene/Hydrogenated Polyisopentene Copolymer
AKA “Polystyrene Copolymer, Synthetic Polymer
Ingredient
Ingredient Facts
Polystyrene/hydrogenated polyisopentene copolymer
AKA: Polystyrene Copolymer, Synthetic Polymer
Ingredient · Light Stabilizer · EWG: 4
Synthetic
Not Clean
Copolymer of polystyrene and hydrogenated polyisopentene
CAS #
-
Form
Liquid
State
Solid
See origin →
Functions
Light Stabilizer
Viscosity Controlling
Shields from UV damage
Traditional Use
Developed in the late 20th century as a synthetic polymer designed to provide film-forming and conditioning properties in cosmetics. Created to replace natural waxes and resins in formulations requiring durability and water resistance.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR