Ingredient review
Bis-HEMA IPDI
INCI: BIS-HEMA IPDI
A synthetic film-former that helps makeup last longer and resist water, but may feel stiff or heavy on sensitive skin.
In plain English
Bis-HEMA IPDI is a man-made ingredient that creates a flexible, water-resistant film on the skin or nails. It is commonly used in long-wear makeup and nail polishes to help the product stay put without smudging or fading. Think of it as a clear, invisible shield that locks your makeup in place.
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-HEMA IPDI 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-HEMA IPDI.
- 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
Bis-HEMA IPDI is a urethane acrylate copolymer, a type of synthetic polymer formed by reacting hydroxyethyl methacrylate (HEMA) with isophorone diisocyanate (IPDI). It is designed to form a durable, flexible film on the skin or nails.
How it works
When applied, the ingredient dries to form a continuous, water-resistant film that adheres to the skin or nail surface. This film helps other ingredients (like pigments) stay in place, reduces transfer, and improves wear time. It also acts as a binder, holding the product together.
Pros
Long-lasting wear
Helps makeup stay intact for hours, even in humid or wet conditions.
Water resistance
Creates a protective film that resists water and sweat, ideal for active lifestyles.
Cons and cautions
Potential stiffness
The film can feel tight or heavy on the skin, especially if you have dry skin or use multiple layers.
Removal difficulty
Requires an oil-based or dual-phase makeup remover to break down the film, which may be inconvenient.
Best for
- People who want long-wear makeup
- Those with oily skin who need smudge-proof products
Use caution if
- Individuals with very dry or sensitive skin
- Those who prefer lightweight, breathable formulas
Usage tips
Safety summary
Generally considered safe for topical use in cosmetics at low concentrations. However, individuals with a history of acrylate allergies should patch-test first. The ingredient is not known to be comedogenic or irritating for most skin types.
Research notes
Limited peer-reviewed studies specifically on Bis-HEMA IPDI in cosmetics. Safety data is largely extrapolated from studies on similar acrylate copolymers, which show low acute toxicity and skin irritation potential. The CIR has reviewed related ingredients and deemed them safe for cosmetic use.
Common label clues
- Typical concentration
- 1–10% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. The Cosmetic Ingredient Review (CIR) panel has evaluated similar acrylate copolymers and found them safe at typical use levels.
- Common uses
- Long-wear foundations, Waterproof mascaras, Lip products, Nail polishes
- Environmental note
- As a synthetic polymer, Bis-HEMA IPDI is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward bio-based alternatives.
Good to know
- Bis-HEMA IPDI is often listed near the end of ingredient lists because it is used in small amounts.
- It is not the same as HEMA (hydroxyethyl methacrylate), which is a monomer used in nail acrylics and can cause allergies in some people.
Common questions
What is Bis-HEMA IPDI in beauty products?
Bis-HEMA IPDI is a man-made ingredient that creates a flexible, water-resistant film on the skin or nails. It is commonly used in long-wear makeup and nail polishes to help the product stay put without smudging or fading. Think of it as a clear, invisible shield that locks your makeup in place.
What does Bis-HEMA IPDI do in a beauty product?
When applied, the ingredient dries to form a continuous, water-resistant film that adheres to the skin or nail surface. This film helps other ingredients (like pigments) stay in place, reduces transfer, and improves wear time. It also acts as a binder, holding the product together.
Is Bis-HEMA IPDI safe for most people?
Generally considered safe for topical use in cosmetics at low concentrations. However, individuals with a history of acrylate allergies should patch-test first. The ingredient is not known to be comedogenic or irritating for most skin types.
Who should be careful with Bis-HEMA IPDI?
Individuals with very dry or sensitive skin Those 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.