Science
Mechanism of Action
Composed of large molecules, Polybutene primarily functions as a film-forming agent, creating a non-occlusive barrier on the skin that effectively minimizes transepidermal water loss and locks in moisture. It also acts as a binder and a non-aqueous viscosity-increasing agent, improving product stability, consistency, and imparting a desirable gloss and feel without absorbing into the skin.
Research
Clinical Evidence
High confidence20%
Key findings
- 01 Clinical studies, including human primary irritation tests, have confirmed that Polybutene in formulations, specifically a lipstick containing 20%, produced no irritation or sensitization. Rabbit studies also demonstrated no irritation at concentrations up to 15%, with only mild irritation observed above this threshold.
Transparency
Dusting Analysis
Polybutene functions as a liquid polymer, primarily acting as a binder and viscosity enhancer, and is not associated with particulate 'dusting' issues in cosmetic formulations.
The Formula
Formulation
Stability
Polybutene demonstrates excellent thermal and chemical stability due to its highly saturated nature, ensuring product integrity over time. Decomposition occurs only under severely high temperature conditions.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Polybutene safe for use in cosmetics. Its safety is further supported by inclusion on the FDA's list of indirect food additives and its low concern rating by the EPA Safer Chemical program, aligning with European Union cosmetic regulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polybutene is a valuable film-forming ingredient, well-tolerated across all skin types, that enhances product feel and provides a non-occlusive barrier for moisture retention without skin penetration.
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References
Sources