Ingredient review
Bis-HEMA Copolymer
INCI: BIS-HEMA POLYNEOPENTYL GLYCOL ADIPATE/IPDI COPOLYMER
A synthetic film-former that helps makeup and sunscreen stay put longer without feeling heavy.
In plain English
This is a synthetic polymer that creates a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup resist sweat, water, and rubbing. It’s commonly used in long-wear foundations, water-resistant sunscreens, and mascaras to keep the product in place throughout the day.
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 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-HEMA 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 HEMA (hydroxyethyl methacrylate), polyneopentyl glycol adipate, and IPDI (isophorone diisocyanate). It belongs to the polyurethane family and is designed to form a durable, flexible film on skin or hair.
How it works
When applied, the copolymer’s molecules link together as the solvent evaporates, forming a continuous, water-resistant film. This film locks in pigments and active ingredients, reducing transfer and improving wear time. It also helps sunscreen actives stay evenly distributed on the skin.
Pros
Excellent wear time
Creates a durable film that keeps makeup and sunscreen in place for hours, even in humid or sweaty conditions.
Lightweight feel
Despite its strong film, it doesn’t feel heavy or greasy on the skin, making it comfortable for all-day wear.
Cons and cautions
Requires double cleansing
Because it forms a water-resistant film, you’ll likely need an oil-based cleanser or micellar water to remove it completely, which can be an extra step.
Not biodegradable
As a synthetic polymer, it does not break down easily in the environment, which may be a concern for eco-conscious users.
Best for
- Anyone wanting long-wearing foundation or concealer
- People who need water-resistant sunscreen for outdoor activities
- Those with normal to oily skin who prefer transfer-proof makeup
Use caution if
- Individuals who prefer minimal, easily removable makeup
- Those with very dry or sensitive skin that reacts to film-formers
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. The individual monomers (HEMA, IPDI) are potential irritants, but in the finished polymer they are chemically bound and not free. Patch testing is rarely needed, but those with known acrylate allergies should exercise caution.
Research notes
Safety data is based on the polymer’s low skin penetration and lack of sensitization in standard tests. No significant toxicity concerns have been reported in cosmetic use. The Cosmetic Ingredient Review (CIR) has reviewed similar polyurethane copolymers and found them safe as used.
Common label clues
- Typical concentration
- 1–10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Long-wear foundations, Water-resistant sunscreens, Lip products, Mascara
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate. Some brands are moving toward bio-based film-formers as alternatives.
Good to know
- This ingredient is often listed near the end of an INCI because it’s used at low concentrations.
- It is not a sunscreen active; it only helps the sunscreen stay on the skin longer.
Common questions
What is Bis-HEMA Copolymer in beauty products?
This is a synthetic polymer that creates a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup resist sweat, water, and rubbing. It’s commonly used in long-wear foundations, water-resistant sunscreens, and mascaras to keep the product in place throughout the day.
What does Bis-HEMA Copolymer do in a beauty product?
When applied, the copolymer’s molecules link together as the solvent evaporates, forming a continuous, water-resistant film. This film locks in pigments and active ingredients, reducing transfer and improving wear time. It also helps sunscreen actives stay evenly distributed on the skin.
Is Bis-HEMA Copolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. The individual monomers (HEMA, IPDI) are potential irritants, but in the finished polymer they are chemically bound and not free. Patch testing is rarely needed, but those with known acrylate allergies should exercise caution.
Who should be careful with Bis-HEMA Copolymer?
Individuals who prefer minimal, easily removable makeup Those with very dry or sensitive skin that reacts to film-formers
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.