Science
Mechanism of Action
It operates as a polymeric binder, effectively adhering individual particles within a cosmetic matrix to prevent separation and ensure a uniform, stable product structure, particularly in powdered and emulsion-based systems.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient exhibits optimal stability within a pH range of 4.0 to 9.0, demonstrating resistance to significant hydrolysis. It is water-soluble and typically dispersed in aqueous systems. Formulators should exercise caution regarding potential sensitizers (e.g., methylisothiazolinone) that may be co-formulated within commercial polyurethane emulsions, avoiding their accumulation. Stability is best maintained by avoiding extreme temperatures.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed polyurethanes, including Polyurethane-33, safe for cosmetic use at concentrations up to 7.5% in leave-on products, provided formulations are non-sensitizing. A critical safety consideration is the absence of residual diisocyanate monomers, which are recognized irritants and sensitizers, in the final product. No specific SCCS review was identified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-33 is a valuable binding agent, ensuring product cohesion and stability, with a favorable safety profile for sensitive skin when formulated correctly and free of residual sensitizers.
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