Ingredient review
Methoxypolyoxymethylene Melamine
INCI: Methoxypolyoxymethylene Melamine
A synthetic film-former that helps products stay put, but it's not a moisturizer or active ingredient.
In plain English
This ingredient is a type of plastic-like polymer that creates a thin, invisible film on your skin. It's used in products like sunscreen and long-wear makeup to help them resist water, sweat, and rubbing off. Think of it like a clear, flexible seal that keeps the product in place. It doesn't hydrate or treat your skin—it's purely a performance enhancer for the formula.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Methoxypolyoxymethylene Melamine is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Methoxypolyoxymethylene Melamine.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic polymer derived from melamine and formaldehyde, chemically modified with methoxy groups to improve compatibility with cosmetic oils and water. It forms a flexible, water-resistant film when applied to skin.
How it works
When the product dries on your skin, the polymer chains link together to create a continuous, breathable film. This film physically locks in pigments and UV filters, preventing them from migrating or washing off. It also helps the product feel smooth and not sticky.
Pros
Boosts wear time
Helps makeup and sunscreen stay put for hours, even in heat or humidity, so you don't have to reapply as often.
Enhances water resistance
Creates a protective barrier that keeps water and sweat from breaking down the product, ideal for beach days or workouts.
Cons and cautions
No skin benefits
This ingredient doesn't moisturize, soothe, or protect your skin—it's purely a performance additive, so it won't improve skin health.
Potential tightness
On very dry or sensitive skin, the film can feel slightly tight or uncomfortable, especially if used in high concentrations.
Best for
- People who need long-wear or waterproof makeup
- Those who use sunscreen in humid or sweaty conditions
Use caution if
- Individuals with very dry or compromised skin barriers who prefer minimal film-formers
Usage tips
Safety summary
Generally considered safe at typical cosmetic concentrations. The polymer is too large to penetrate skin deeply. However, it is derived from formaldehyde, and trace residues are possible, though regulated to safe levels. No significant irritation or allergy data is reported.
Research notes
Limited peer-reviewed studies specifically on this ingredient. Most safety data comes from industry assessments and regulatory reviews. It is considered safe based on its large molecular size and low skin penetration.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The formaldehyde content is tightly controlled to trace levels, but some consumers prefer to avoid formaldehyde-releasing polymers.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations
- Environmental note
- As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward biodegradable film-formers.
Good to know
- This ingredient is often listed near the end of an ingredient list, indicating a low concentration.
- It's commonly found in 'waterproof' or 'long-wear' labeled products.
Common questions
What is Methoxypolyoxymethylene Melamine in beauty products?
This ingredient is a type of plastic-like polymer that creates a thin, invisible film on your skin. It's used in products like sunscreen and long-wear makeup to help them resist water, sweat, and rubbing off. Think of it like a clear, flexible seal that keeps the product in place. It doesn't hydrate or treat your skin—it's purely a performance enhancer for the formula.
What does Methoxypolyoxymethylene Melamine do in a beauty product?
When the product dries on your skin, the polymer chains link together to create a continuous, breathable film. This film physically locks in pigments and UV filters, preventing them from migrating or washing off. It also helps the product feel smooth and not sticky.
Is Methoxypolyoxymethylene Melamine safe for most people?
Generally considered safe at typical cosmetic concentrations. The polymer is too large to penetrate skin deeply. However, it is derived from formaldehyde, and trace residues are possible, though regulated to safe levels. No significant irritation or allergy data is reported.
Who should be careful with Methoxypolyoxymethylene Melamine?
Individuals with very dry or compromised skin barriers who prefer minimal film-formers
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.