Science
Mechanism of Action
As an emollient, Polyisobutene creates a thin, cohesive, and occlusive barrier on the epidermis. This physical barrier significantly reduces transepidermal water loss (TEWL), thereby locking in moisture to maintain skin hydration and suppleness. Additionally, it serves as a non-reactive binder, a film-forming agent, and a non-aqueous viscosity controller within cosmetic formulations, facilitating smooth application and enhancing product stability.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyisobutene demonstrates high chemical inertness and resistance to degradation. While specific pH stability data for Polyisobutene is not available, closely related Hydrogenated Polyisobutene is known to be stable across extreme pH ranges. It presents as a clear to pale yellow, viscous liquid, enhancing product texture and acting as a stabilizer.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has determined Polyisobutene to be safe for use in cosmetics at typical concentrations. While no explicit maximum concentration for Polyisobutene itself is provided for safety, related Hydrogenated Polyisobutene has been documented in products, such as lipsticks, at concentrations up to 95%. Clinical patch tests on Hydrogenated Polyisobutene at 4% and 1.44% showed no dermal irritation or sensitization. Polyisobutene is also approved by the FDA for use in chewing gum and as an indirect food additive, and is permissible in cosmetics within the European Union.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyisobutene is a valuable ingredient for enhancing skin hydration and protection through its occlusive film-forming properties, while also improving product texture and stability with minimal risk of irritation or comedogenicity.
Related
Similar Ingredients
Finding similar ingredients…