Polyisobutene ●
TL;DR. This ingredient is primarily used as a film-former, binder, gloss enhancer, and viscosity modifier, especially in lip products, color cosmetics, balms, and water-resistant formulas.
What does Polyisobutene do in a cosmetic formula?
This ingredient is primarily used as a film-former, binder, gloss enhancer, and viscosity modifier, especially in lip products, color cosmetics, balms, and water-resistant formulas.
Is Polyisobutene clean?
From a clean beauty perspective, this ingredient faces scrutiny because it is a synthetic, non-biodegradable polymer that some standards classify under microplastic or persistent polymer restrictions. It is generally low in irritation and sensitization potential, so the main concern is standards alignment rather than skin tolerance.
Is Polyisobutene sustainable?
This material is typically petroleum-derived and is not readily biodegradable, which gives it a weaker sustainability profile than plant-derived waxes, oils, or biodegradable film-formers. Its environmental concern is persistence after use rather than high direct reactivity or instability.
Is Polyisobutene COSMOS-approved?
This ingredient is not permitted in COSMOS-natural or COSMOS-organic formulas because it is a petrochemical-derived synthetic polymer. It has limited Green Chemistry alignment due to fossil sourcing and poor biodegradability, despite being chemically stable and low in skin reactivity.
How does Polyisobutene work chemically?
Chemically, this material is a saturated, highly branched hydrocarbon polymer with a broad molecular-weight range, which gives anhydrous formulas cushion, gloss, adhesion, and water resistance. It is stable across normal cosmetic pH conditions, often appears from low single-digit levels to much higher levels in lip and balm systems, and is usually paired with waxes, oils, or elastomeric structuring agents to tune payoff and tack.
Last updated 2026-05-13