Polymethyl Methacrylate
INCI: POLYMETHYL METHACRYLATE
Reviewed by Emma · Last updated 14 Aug 2026
A film-forming polymer that creates a protective layer on the skin surface
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Usage Frequency
Daily
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What Is Polymethyl Methacrylate?
Polymethyl methacrylate (PMMA) is a synthetic polymer — a chain-like molecule made up of repeating units. In skincare, it functions as a film former, meaning it deposits a thin, continuous layer on the skin's surface when applied in a formula.
PMMA has a long history in medical and cosmetic applications; it has been used as bone cement in surgery and in injectable fillers for decades. In topical skincare products, it appears in a relatively small proportion of formulations (around 1.3% of skincare products on the market).
How It Works
PMMA works by forming a continuous film across the skin surface. When applied as part of a skincare formulation, the polymer chains link together to create a protective coating that sits on top of the skin.
This film-forming action can reduce water evaporation from the skin, helping to maintain hydration levels. The layer is removable with normal cleansing and does not penetrate the skin or alter skin structure.
Clinical Evidence & References
PMMA has an established safety record in medical applications, particularly in injectable form where it has been used for soft-tissue augmentation. However, research specifically on topical PMMA in skincare formulations is limited.
The evidence for film-forming agents in general suggests they can support skin barrier function and reduce water loss, though individual efficacy depends on formulation design and concentration. More targeted research on PMMA specifically in topical products would strengthen understanding of its skincare benefits.
How to Use
PMMA-containing products are typically used as part of a standard skincare routine. Apply to clean skin as directed by the product instructions. As it forms a surface layer, cleanse thoroughly in the evening to remove the product and allow the skin to breathe overnight.
Safety & Precautions
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