Science
Mechanism of Action
On the skin, polyethylene forms a protective, non-occlusive film that minimizes transepidermal water loss (TEWL), thereby locking in hydration and contributing to skin smoothness. Within formulations, it acts as a thickening agent to modify viscosity, a binder to ensure ingredient cohesion, and an emulsion stabilizer to prevent phase separation. Historically, polyethylene microbeads were employed for physical exfoliation, a practice now largely discontinued.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene effectively stabilizes cosmetic products by preventing component separation and maintaining consistent texture across varying temperatures. However, its integrity can be compromised through degradation and oxidation when exposed to heat, light, and oxygen, which may lead to diminished physical properties.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed polyethylene safe for cosmetic use, citing its substantial molecular size which restricts significant dermal absorption and systemic exposure. While the FDA permits its use in specific food-contact materials, environmental concerns regarding microplastic release have led the European Chemicals Agency to classify it as a substance of very high concern; this classification pertains to ecological impact, not direct human health risks.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyethylene is a valuable formulation aid, enhancing product stability, texture, and providing significant moisturization support through film-forming, with a low risk of skin irritation.
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