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Hydrogenated Styrene Isoprene Copolymer
AKA “
● 2-METHYLBUTA-1, POLYMER WITH 2-METHYL-1, 3-BUTADIENE
”
Synthetic
🦆
❤️
👻
Ingredient Facts
Hydrogenated styrene isoprene copolymer
AKA: ● 2-METHYLBUTA-1, POLYMER WITH 2-METHYL-1, 3-BUTADIENE
Synthetic · Film Forming · EWG: 1
WHAT IS IT?
Synthetic
Occlusive
Synthetic
Clean
Hydrogenated Styrene Isoprene Copolymer is a cosmetic ingredient. Rated low hazard by EWG.
CAS #
68648-89-5
Form
Liquid
State
Solid
See origin →
WHAT'S IT DO?
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Viscosity Controlling
Controls Viscosity
Skin Types
●
all-skin-types
Take the Skin ID quiz
to see if this matches your skin
IS IT SAFE?
EWG
1
CIR
—
Pregnancy
—
Restricted By
Ulta Conscious Beauty
CIR Safety Findings
all-shades-safe
Regulatory Agencies
EWG
WHAT'S THE PROOF?
Hydrogenated Styrene Isoprene Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
1,3-Butadiene
Health Canada
Health Canada Cosmetic Ingredient Hotlist
→
Verified Jun 2026
Data: CosIng · EWG