Hydrogenated Styrene/Isoprene Copolymer

Hydrogenated styrene/isoprene copolymer is a synthetic polymer made by saturating a styrene-isoprene backbone to improve stability and clarity. It forms flexible films, adds tack, and boosts texture in balms, mascaras, and long-wear cosmetics.
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Ingredient Snapshot

Overview
A synthetic polymer that helps makeup stay put without smearing.
Category
Tone/Texture
Type
Film Former

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Creates a flexible layer that helps makeup stay put and resist smearing. Contributes to a smoother, more uniform finish with better grip on skin or lashes.

Uses In Skincare & Cosmetics

Frequently used in mascaras, liquid eyeliners, and brow products to improve hold. Also included in balms and transfer-resistant lip formulas for longer wear.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Considered inert for most skin types; may cause temporary eye or skin irritation if the product migrates into eyes or is removed too aggressively. No known specific regulatory limits in cosmetics when used as intended.

Is Hydrogenated Styrene/Isoprene Copolymer a Good Ingredient?

Rated Good because it forms clear, flexible films that improve adhesion and wear in color cosmetics while staying stable over time. It delivers dependable hold and texture control with no significant sensitization reports, though its role is mainly cosmetic rather than skin-benefiting, which caps it at Good.

Products with Hydrogenated Styrene/Isoprene Copolymer

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