Polystyrene/Hydrogenated Polyisopentene Copolymer
AKA “Polystyrene Copolymer, Synthetic Polymer
Synthetic
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Ingredient Facts
Polystyrene/hydrogenated polyisopentene copolymer
AKA: Polystyrene Copolymer, Synthetic Polymer
Synthetic · Light Stabilizer | Viscosity Controlling · EWG: 4
Plant-Derived
Synthetic
Clean
Copolymer of polystyrene and hydrogenated polyisopentene Science: Process: Catalytic Hydrogenation | Functions: Light Stabilizer, Viscosity Controlling Safety Ratings: CIR: Safe as used
CAS #
-
Form
Liquid
Plant-Derived
Synthetic. A copolymer created by chemically linking polystyrene and hydrogenated polyisopentene, both petroleum-derived synthetic polymers. Synthesized through catalytic hydrogenation of polyisopentene followed by copolymerization with polystyrene monomers.
Function
Light Stabilizer | Viscosity Controlling
Benefits
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
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR