Ingredient review
Bis-HEA Polybutanediol/IPDI Copolymer
INCI: BIS-HEA POLY(1,4-BUTANEDIOL)-9/IPDI COPOLYMER
A synthetic polymer that helps makeup and sunscreen stay put longer, but may feel heavy on some skin types.
In plain English
This ingredient is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. Think of it like a clear, invisible glove that helps makeup resist sweat, water, and rubbing. It's commonly used in long-wear foundations, waterproof mascaras, and sunscreens to improve durability. Because it's a large molecule, it sits on the surface and doesn't penetrate deeply, which keeps irritation low for most people.
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-HEA Polybutanediol/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-HEA Polybutanediol/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 created by reacting bis-HEA (a diol) with poly(1,4-butanediol)-9 and isophorone diisocyanate (IPDI). It belongs to the polyurethane family and is designed to form a durable, flexible film.
How it works
When applied, the solvent evaporates and the polymer chains link together into a continuous film. This film physically blocks water and oil from disturbing the product underneath, extending wear time and improving water resistance.
Pros
Excellent wear time
Creates a durable film that helps makeup and sunscreen resist smudging, sweat, and water for hours.
Low irritation potential
Large polymer molecules stay on the skin's surface, making it unlikely to cause allergic reactions or clog pores for most people.
Cons and cautions
Can feel heavy
The film-forming nature may leave a tight or sticky sensation, especially on dry or dehydrated skin.
Requires thorough removal
Water-resistant films often need an oil-based cleanser or micellar water to fully remove, adding an extra step to your routine.
Best for
- People who want long-wearing makeup or waterproof sunscreen
- Those with normal to oily skin who don't mind a slight film feel
Use caution if
- Individuals with very dry or sensitive skin who prefer lightweight, breathable formulas
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. The large molecular size prevents significant skin penetration, keeping irritation and allergy risks low. However, individuals with very sensitive skin may experience tightness or discomfort.
Research notes
Limited independent studies on this specific copolymer, but the broader polyurethane family has a long history of safe use in cosmetics. Most safety data comes from industry assessments and regulatory reviews.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific concentration limits are set, but typical use levels are low (under 10%).
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward biodegradable alternatives.
Good to know
- This ingredient is often listed under the broader category 'Polyurethane' on some product labels.
- It is not water-soluble, so it won't wash off with water alone.
Common questions
What is Bis-HEA Polybutanediol/IPDI Copolymer in beauty products?
This ingredient is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. Think of it like a clear, invisible glove that helps makeup resist sweat, water, and rubbing. It's commonly used in long-wear foundations, waterproof mascaras, and sunscreens to improve durability. Because it's a large molecule, it sits on the surface and doesn't penetrate deeply, which keeps irritation low for most people.
What does Bis-HEA Polybutanediol/IPDI Copolymer do in a beauty product?
When applied, the solvent evaporates and the polymer chains link together into a continuous film. This film physically blocks water and oil from disturbing the product underneath, extending wear time and improving water resistance.
Is Bis-HEA Polybutanediol/IPDI Copolymer safe for most people?
Considered safe for cosmetic use at typical concentrations. The large molecular size prevents significant skin penetration, keeping irritation and allergy risks low. However, individuals with very sensitive skin may experience tightness or discomfort.
Who should be careful with Bis-HEA Polybutanediol/IPDI Copolymer?
Individuals with very dry or sensitive skin who prefer lightweight, breathable 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.