Ingredient review
Bis-PEG-15 Dimethicone/IPDI Copolymer
INCI: BIS-PEG-15 DIMETHICONE/IPDI COPOLYMER
A synthetic silicone polymer that helps products stay put longer, especially in sunscreens and long-wear makeup.
In plain English
This is a man-made ingredient that combines silicone with a plastic-like polymer. When applied to skin, it dries down to form a flexible, water-resistant film. Think of it like a very thin, invisible raincoat that helps your makeup or sunscreen stay in place longer, even if you sweat or get wet. It's commonly found in products labeled 'waterproof' or 'long-wear.'
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-PEG-15 Dimethicone/IPDI 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 Bis-PEG-15 Dimethicone/IPDI 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 by reacting dimethicone (a silicone) with IPDI (a type of isocyanate) and PEG-15 (a polyethylene glycol chain). It belongs to a class of ingredients called film formers.
How it works
When the product is applied, the solvent (often water or alcohol) evaporates, leaving behind a thin, flexible film of the copolymer on the skin. This film physically blocks water and oil from disturbing the underlying product, improving wear time and water resistance.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective longer during swimming, sweating, or humid conditions.
Lightweight feel
Unlike some older film formers, this silicone-based version feels flexible and non-sticky on skin.
Cons and cautions
Can be hard to remove
Requires a double cleanse or oil-based makeup remover to fully wash off, which may be inconvenient.
Potential tightness
On very dry or sensitive skin, the film can feel slightly tight or uncomfortable after several hours.
Best for
- Anyone wanting longer-lasting sunscreen or makeup
- People who sweat or swim and need water-resistant protection
Use caution if
- Those with very dry or compromised skin barriers who may find film formers too occlusive
- Anyone who prefers minimal synthetic ingredients in their routine
Usage tips
Safety summary
Generally considered safe for topical use in cosmetics. Low irritation and comedogenic risk. However, as with any film former, individuals with very sensitive or compromised skin should patch test first.
Research notes
Limited peer-reviewed studies specifically on this copolymer, but the broader class of dimethicone copolymers is well-studied and considered safe. Most evidence comes from manufacturer safety data and regulatory reviews.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, USA, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed similar silicone copolymers and found them safe as used.
- Common uses
- Sunscreens, Long-wear foundations, Waterproof mascara, Lip products
- Environmental note
- As a synthetic silicone-based polymer, it is not biodegradable and may accumulate in the environment. Some manufacturers are exploring bio-based alternatives.
Good to know
- This ingredient is often used in combination with other silicones to improve spreadability.
- It is considered safe for use in cosmetics by major regulatory bodies at typical concentrations.
Common questions
What is Bis-PEG-15 Dimethicone/IPDI Copolymer in beauty products?
This is a man-made ingredient that combines silicone with a plastic-like polymer. When applied to skin, it dries down to form a flexible, water-resistant film. Think of it like a very thin, invisible raincoat that helps your makeup or sunscreen stay in place longer, even if you sweat or get wet. It's commonly found in products labeled 'waterproof' or 'long-wear.'
What does Bis-PEG-15 Dimethicone/IPDI Copolymer do in a beauty product?
When the product is applied, the solvent (often water or alcohol) evaporates, leaving behind a thin, flexible film of the copolymer on the skin. This film physically blocks water and oil from disturbing the underlying product, improving wear time and water resistance.
Is Bis-PEG-15 Dimethicone/IPDI Copolymer safe for most people?
Generally considered safe for topical use in cosmetics. Low irritation and comedogenic risk. However, as with any film former, individuals with very sensitive or compromised skin should patch test first.
Who should be careful with Bis-PEG-15 Dimethicone/IPDI Copolymer?
Those with very dry or compromised skin barriers who may find film formers too occlusive Anyone who prefers minimal synthetic ingredients in their routine
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.