Science
Mechanism of Action
This ingredient operates by forming a uniform film across the surface of the skin, hair, or nails, thereby providing a physical barrier. Concurrently, it offers skin conditioning benefits, contributing to the overall maintenance of skin health.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While specific stability data for POLYESTER-4 in cosmetic formulations is absent, general polyester materials demonstrate varying degradation rates influenced by the pH of their aqueous environment. For instance, PET fabric's zeta potential is noted around pH 5.5, and dyeing typically occurs between pH 4.5–5.5, indicating pH sensitivity for related polyesters.
Safety
Safety Profile
A comprehensive safety assessment by CIR or SCCS with defined maximum concentrations for POLYESTER-4 is currently unavailable. However, SkinSAFE categorizes 'Polyester-4' as generally safe for various uses, including 'Teen SAFE', 'Lip Safe', 'Baby Safe', and 'Eyelid SAFE', further noting it as 'Irritant Free', 'Dye Free', and 'SLS Free', which suggests a low potential for irritation or allergic reactions in cosmetic applications. It is important to differentiate this cosmetic ingredient from general polyester fabrics, which, due to their physical properties, can trap heat and moisture. The FDA has listed 'POLYESTER' (CAS Reg. No. 977012-15-9) within food additive regulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While POLYESTER-4 exhibits film-forming and conditioning properties with indications of low irritation potential, its comprehensive safety profile and optimal usage concentrations require further dedicated clinical investigation.
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