Science
Mechanism of Action
Functioning primarily as a film former, Polybutylene Terephthalate creates a delicate, uniform layer on the skin or product surface, which can contribute to the longevity and aesthetics of the cosmetic application. Concurrently, it acts as a viscosity-controlling agent, effectively adjusting the thickness and consistency of formulations to ensure optimal spreadability and sensory experience.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
This ingredient is not associated with 'dusting' in the context of active ingredient efficacy or formulation challenges typically described by this term.
The Formula
Formulation
Stability
Polybutylene Terephthalate demonstrates instability and is susceptible to hydrolysis at temperatures exceeding 60°C. This degradation process renders the material highly breakable upon exposure to strong acids, alkaline substances, and hot water.
Conflicts
- strong acids
- alkaline substances
- hot water (>60°C)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that modified terephthalate polymers, including Polybutylene Terephthalate, are safe for use in cosmetics at reported concentrations. This assessment largely leveraged safety data from these polymers in medical devices due to their chemical similarity. Environment Canada has classified Polybutylene Terephthalate as not anticipated to be toxic or harmful.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polybutylene Terephthalate is a safe and effective functional polymer, contributing to product texture and film-forming properties rather than direct skin benefits.
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References
Sources