Polyurethane-33
INCI: POLYURETHANE-33
Reviewed by Daisy · Last updated 14 Aug 2026
A film-forming polymer that helps bind formula ingredients together
Best For Skin Types
All
Usage Frequency
As directed by product instructions
What Is Polyurethane-33?
Polyurethane-33 is a synthetic polymer—a long-chain molecule made up of repeating urethane units. It functions as a binder in skincare formulations, helping to hold other ingredients together and create a cohesive texture.
In skincare products, this ingredient plays a structural role rather than delivering direct benefits to the skin itself. Its primary job is to stabilise the formula and improve how the product applies and feels on the skin.
How It Works
Polyurethane-33 works by forming a film or network within the product formulation. This polymer structure traps and holds other ingredients in place, preventing them from separating or settling over time. When applied to skin, it can also form a light protective layer.
The ingredient's binding properties mean it helps formulators create products with the desired consistency and performance characteristics, though it does not penetrate the skin or provide active skincare benefits.
Clinical Evidence & References
Research on polyurethane polymers in cosmetics is limited. Most evidence comes from safety and stability testing rather than skincare efficacy studies. The ingredient is generally recognised as safe for cosmetic use by regulatory bodies.
There is no substantial clinical evidence that polyurethane-33 itself improves skin condition. Its value lies in supporting formula stability and application characteristics, allowing active ingredients to perform as intended.
How to Use
No special usage considerations are needed for products containing polyurethane-33. Use the product as directed by the manufacturer. If a formula feels particularly smooth or has consistent texture from first use to last, the binder is doing its job effectively.
Safety & Precautions
Frequently Asked Questions
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