Ingredient review
Bis-Methoxy PEG-10 Poly(TMXDI)
INCI: BIS-METHOXY PEG-10 POLY(TETRAMETHYLXYLENE DIISOCYANATE)
A synthetic film-former that helps makeup last longer and resist water, but may feel tight or dry on sensitive skin.
In plain English
This ingredient is a man-made polymer that forms a thin, flexible film on your skin. It's like a clear, invisible shield that helps makeup stay put and resist sweat, water, and smudging. You'll often find it in long-wear foundations, waterproof eyeliners, and lip products. While it's generally safe and non-irritating, the film can sometimes feel a bit tight or drying, especially if you have dry or sensitive skin.
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
Bis-Methoxy PEG-10 Poly(TMXDI) 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 Bis-Methoxy PEG-10 Poly(TMXDI).
- 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 created by reacting a diisocyanate with PEG (polyethylene glycol) chains. It's designed to form a flexible, water-resistant film on the skin or hair.
How it works
When applied, the polymer molecules link together as the solvent evaporates, creating a continuous, flexible film. This film physically locks in pigments and other ingredients, preventing them from transferring or washing off easily. It also helps smooth the skin's surface by filling in fine lines and pores.
Pros
Long-lasting wear
Creates a flexible film that helps makeup stay put for hours, even in humid or sweaty conditions.
Water and smudge resistant
Forms a barrier that resists water, sweat, and oil, reducing the need for touch-ups.
Cons and cautions
Can feel tight or dry
The film may cause a slight tightening sensation, which can be uncomfortable for those with dry or sensitive skin.
Requires double cleansing
Because it's water-resistant, you'll likely need an oil-based cleanser or micellar water to remove it completely.
Best for
- Anyone wanting long-lasting, transfer-proof makeup
- People with oily or combination skin who need extra staying power
Use caution if
- Those with very dry or dehydrated skin who dislike a tight feeling
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polyurethane polymers and found them safe. Rare reports of mild irritation exist, but overall risk is low.
Research notes
Limited peer-reviewed studies specifically on this ingredient, but the broader class of polyurethane film-formers is well-studied and considered safe. Most evidence comes from manufacturer safety data and regulatory reviews.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. The EU CosIng database lists it as a film-forming agent with no specific restrictions.
- Common uses
- Long-wear foundations, Waterproof eyeliners, Lip products, Sunscreens
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate.
Good to know
- This ingredient is a type of polyurethane, a class of polymers known for flexibility and durability.
- It is often used in combination with other film-formers to fine-tune the feel and longevity of a product.
Common questions
What is Bis-Methoxy PEG-10 Poly(TMXDI) in beauty products?
This ingredient is a man-made polymer that forms a thin, flexible film on your skin. It's like a clear, invisible shield that helps makeup stay put and resist sweat, water, and smudging. You'll often find it in long-wear foundations, waterproof eyeliners, and lip products. While it's generally safe and non-irritating, the film can sometimes feel a bit tight or drying, especially if you have dry or sensitive skin.
What does Bis-Methoxy PEG-10 Poly(TMXDI) do in a beauty product?
When applied, the polymer molecules link together as the solvent evaporates, creating a continuous, flexible film. This film physically locks in pigments and other ingredients, preventing them from transferring or washing off easily. It also helps smooth the skin's surface by filling in fine lines and pores.
Is Bis-Methoxy PEG-10 Poly(TMXDI) safe for most people?
Considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polyurethane polymers and found them safe. Rare reports of mild irritation exist, but overall risk is low.
Who should be careful with Bis-Methoxy PEG-10 Poly(TMXDI)?
Those with very dry or dehydrated skin who dislike a tight feeling
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.