Ingredient review
PEG/PPG/SMDI Copolymer
INCI: BIS-METHOXY PEG-13 PEG-502/PPG-57/SMDI COPOLYMER
A synthetic film-former that helps makeup and skincare last longer and resist water, but offers no active skincare benefit.
In plain English
This ingredient is a type of plastic-like polymer that spreads into a thin, flexible film on your skin. It helps makeup stay put longer, makes sunscreens more water-resistant, and can give products a smooth, silky feel. It doesn't treat or change your skin—it's purely a performance enhancer.
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
PEG/PPG/SMDI Copolymer 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 PEG/PPG/SMDI Copolymer.
- 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 large synthetic molecule made by linking polyethylene glycol (PEG), polypropylene glycol (PPG), and a diisocyanate (SMDI). It is designed to form a flexible, water-resistant film on skin or hair.
How it works
When applied, the copolymer dries into a transparent, flexible film that physically locks in pigments and other ingredients. This film resists water, sweat, and rubbing, extending the wear time of the product.
Pros
Boosts wear time
Helps foundation, mascara, and sunscreen stay put for hours without smudging or fading.
Water-resistant
Creates a barrier that resists water and sweat, ideal for humid conditions or swimming.
Cons and cautions
No skincare benefit
It doesn't hydrate, soothe, or treat the skin—it's purely a cosmetic film.
Potential tightness
On very dry or dehydrated skin, the film can feel tight or uncomfortable, especially in heavy layers.
Best for
- Anyone wanting long-wear makeup or water-resistant sunscreen
- People with normal to oily skin who prefer a matte finish
Use caution if
- Those who prefer minimal synthetic ingredients in their routine
- Very dry or sensitive skin that may feel tight with film-formers
Usage tips
Safety summary
Considered safe for topical use in cosmetics at typical concentrations. PEG compounds can contain trace impurities like ethylene oxide, but cosmetic-grade ingredients are purified to safe levels. Overall low irritation and allergy risk.
Research notes
Limited independent studies on this specific copolymer. Safety is inferred from broader polymer and PEG safety data. The Cosmetic Ingredient Review (CIR) has reviewed similar PEG polymers and found them safe as used.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and other major markets. No known restrictions at typical use levels.
- Common uses
- Long-wear foundations, Waterproof mascara, Sunscreens, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable. Some environmental concerns exist regarding accumulation, but it is used in low concentrations.
Good to know
- This ingredient is often used in 'transfer-proof' or '24-hour wear' makeup formulas.
- It is not considered comedogenic, so it's generally safe for acne-prone skin.
Common questions
What is PEG/PPG/SMDI Copolymer in beauty products?
This ingredient is a type of plastic-like polymer that spreads into a thin, flexible film on your skin. It helps makeup stay put longer, makes sunscreens more water-resistant, and can give products a smooth, silky feel. It doesn't treat or change your skin—it's purely a performance enhancer.
What does PEG/PPG/SMDI Copolymer do in a beauty product?
When applied, the copolymer dries into a transparent, flexible film that physically locks in pigments and other ingredients. This film resists water, sweat, and rubbing, extending the wear time of the product.
Is PEG/PPG/SMDI Copolymer safe for most people?
Considered safe for topical use in cosmetics at typical concentrations. PEG compounds can contain trace impurities like ethylene oxide, but cosmetic-grade ingredients are purified to safe levels. Overall low irritation and allergy risk.
Who should be careful with PEG/PPG/SMDI Copolymer?
Those who prefer minimal synthetic ingredients in their routine Very dry or sensitive skin that may feel tight with 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.