Ingredient review
PEG Soyamine Polyurethane Copolymer
INCI: DI-PEG-2 SOYAMINE/POLYDIETHYLENEGLYCOL ADIPATE/IPDI COPOLYMER
A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a man-made plastic-like ingredient that forms a thin, flexible film on your skin or hair. It helps makeup and sunscreen stay in place longer and resist sweat or water. Think of it like a clear, invisible shield that keeps your product from sliding off. It doesn't moisturize or treat your skin—it's purely a performance booster 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
PEG Soyamine Polyurethane 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 Soyamine Polyurethane 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 synthetic copolymer created by reacting soy-derived amines with polyethylene glycol, adipic acid, and isophorone diisocyanate. It belongs to a class of ingredients called film-formers, which are common in long-wear and water-resistant cosmetics.
How it works
When applied, the copolymer dries down to form a continuous, flexible film over the skin or hair. This film physically locks in pigments and other ingredients, reducing transfer and improving resistance to water, sweat, and friction. It also helps control the viscosity (thickness) of the product for a smooth application.
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.
Water-resistant
Forms a barrier that resists water and sweat, making it ideal for swim, gym, or rainy days.
Cons and cautions
No skincare benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or treat your skin in any way.
Can feel uncomfortable
In high amounts, the film can feel tight, stiff, or 'mask-like' on the skin, which some people find unpleasant.
Best for
- People who want long-wearing makeup or water-resistant sunscreen
- Those with oily skin who struggle with makeup sliding off
Use caution if
- People who prefer minimal, simple ingredient lists
- Those who dislike a tight or 'plastic' feel on skin
Usage tips
Safety summary
Generally recognized as safe for topical use at typical concentrations. Low irritation and comedogenic potential. However, long-term environmental impact is a concern due to poor biodegradability.
Research notes
Limited peer-reviewed research specifically on this copolymer. Its safety profile is inferred from similar film-forming polymers used in cosmetics. The Cosmetic Ingredient Review (CIR) has evaluated related polyurethane copolymers 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, and other major markets. No specific concentration restrictions, but formulators typically use it at low levels.
- Common uses
- Sunscreens, Waterproof mascaras, Long-wear foundations, Lip products
- Environmental note
- As a synthetic polymer, it is not readily biodegradable and may contribute to microplastic pollution. Some brands are moving toward biodegradable alternatives.
Good to know
- This ingredient is often found in 'long-wear' or '24-hour' makeup claims.
- It is not considered a major irritant or allergen, but individual sensitivity is always possible.
Common questions
What is PEG Soyamine Polyurethane Copolymer in beauty products?
This is a man-made plastic-like ingredient that forms a thin, flexible film on your skin or hair. It helps makeup and sunscreen stay in place longer and resist sweat or water. Think of it like a clear, invisible shield that keeps your product from sliding off. It doesn't moisturize or treat your skin—it's purely a performance booster for the formula.
What does PEG Soyamine Polyurethane Copolymer do in a beauty product?
When applied, the copolymer dries down to form a continuous, flexible film over the skin or hair. This film physically locks in pigments and other ingredients, reducing transfer and improving resistance to water, sweat, and friction. It also helps control the viscosity (thickness) of the product for a smooth application.
Is PEG Soyamine Polyurethane Copolymer safe for most people?
Generally recognized as safe for topical use at typical concentrations. Low irritation and comedogenic potential. However, long-term environmental impact is a concern due to poor biodegradability.
Who should be careful with PEG Soyamine Polyurethane Copolymer?
People who prefer minimal, simple ingredient lists Those who dislike a tight or 'plastic' feel on skin
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.