Science
Mechanism of Action
As a viscosity controlling agent, Polypropylene modulates the internal friction within cosmetic formulations, thereby precisely adjusting the thickness and flow characteristics to achieve the desired product consistency. It further functions as a film former, creating a uniform, protective layer upon application.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Polypropylene presents a moderate respiratory concern if formulated into inhalable product forms, such as sprays or powders, according to EWG assessments. Its use in solid or liquid products, however, significantly reduces this inhalation risk.
The Formula
Formulation
Stability
Polypropylene is a highly stable, non-polar, and hydrophobic polymer, demonstrating excellent chemical resistance across a broad pH range of 2 to 12 without significant degradation. Its inert nature prevents undesirable interactions with common cosmetic ingredients, preserving formulation integrity. It is also heat-stable, withstanding temperatures up to 160°C.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed Polypropylene as safe for its intended use in cosmetic formulations. Adverse reactions are uncommon. While the FDA approves polypropylene for food and cosmetic packaging contact due to its inert properties, direct certification for skin contact is not explicitly noted. EWG classifies its cancer risk as low and developmental/reproductive toxicity as low, but flags moderate potential for allergies and immunotoxicity. Respiratory concerns exist for inhalable product forms (sprays, powders), but these risks are significantly mitigated in solid or liquid formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polypropylene is a valuable inert polymer, widely recognized for its robust ability to control product consistency and enhance formulation stability with a low risk of skin irritation or comedogenicity, though inhalation risk should be considered for specific product types.
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