Ingredient review
IPDI/PEG-15 Soyamine Copolymer
INCI: IPDI/PEG-15 SOYAMINE COPOLYMER
A synthetic film-former that helps products stay put, but offers no active skincare benefit.
In plain English
This ingredient is a man-made polymer that creates a thin, flexible film on your skin or hair. It's often added to sunscreens and long-wear makeup to make them more water-resistant and help them last longer. Think of it like a very light, invisible shield that keeps the product in place. It doesn't moisturize or treat your skin—it's purely a performance ingredient.
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
IPDI/PEG-15 Soyamine 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 IPDI/PEG-15 Soyamine 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 made from isophorone diisocyanate (IPDI) and a PEG-modified soyamine. It's designed to form a flexible, water-resistant film on the skin or hair.
How it works
When applied, the copolymer molecules link together as the solvent evaporates, creating a continuous, flexible film. This film physically blocks water from washing away the product and helps pigments or active ingredients stay on the skin longer.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective longer when you're sweating or in water.
Improves wear time
Creates a flexible film that keeps foundation and mascara from smudging or fading throughout the day.
Cons and cautions
No skincare benefit
It's purely a performance ingredient—it won't hydrate, soothe, or treat your skin.
Can feel heavy on oily skin
The film may feel slightly tacky or occlusive, which some people with oily skin find uncomfortable.
Best for
- Anyone wanting longer-lasting sunscreen or makeup
- People who swim or sweat and need water-resistant products
Use caution if
- Those with very oily or acne-prone skin who prefer lightweight, non-film-forming formulas
Usage tips
Safety summary
Considered safe at typical cosmetic concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Research notes
Limited independent studies on this specific copolymer, but film-forming polymers in its class are well-established as safe and effective in cosmetics. No major safety flags.
Common label clues
- Typical concentration
- 1–5% in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng). No known restrictions at typical use levels.
- Common uses
- Sunscreens, Waterproof mascara, Long-wear foundations, Lip products
- Environmental note
- As a synthetic polymer, it may not be biodegradable. Check if the product is labeled as reef-safe if used in sunscreens.
Good to know
- This ingredient is often found in 'water-resistant' or 'long-wear' labeled products.
- It is not a humectant or emollient—it won't add moisture to your skin.
Common questions
What is IPDI/PEG-15 Soyamine Copolymer in beauty products?
This ingredient is a man-made polymer that creates a thin, flexible film on your skin or hair. It's often added to sunscreens and long-wear makeup to make them more water-resistant and help them last longer. Think of it like a very light, invisible shield that keeps the product in place. It doesn't moisturize or treat your skin—it's purely a performance ingredient.
What does IPDI/PEG-15 Soyamine Copolymer do in a beauty product?
When applied, the copolymer molecules link together as the solvent evaporates, creating a continuous, flexible film. This film physically blocks water from washing away the product and helps pigments or active ingredients stay on the skin longer.
Is IPDI/PEG-15 Soyamine Copolymer safe for most people?
Considered safe at typical cosmetic concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Who should be careful with IPDI/PEG-15 Soyamine Copolymer?
Those with very oily or acne-prone skin who prefer lightweight, non-film-forming formulas
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.