Ingredient review
Bis-HEMA Polybutylene Glycol/IPDI Copolymer
INCI: BIS-HEMA POLY(1,4-BUTANEDIOL)-14/IPDI COPOLYMER
A synthetic polymer that helps makeup last longer and resist water, but may feel stiff or tight on some skin types.
In plain English
This is a man-made plastic-like ingredient that forms a thin, flexible film on your skin. It helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, invisible shield that holds your foundation or eyeliner in place. Because it's a polymer, it can sometimes feel a bit tight or dry on the skin, especially if you have a dry skin type.
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 Polybutylene Glycol/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-HEMA Polybutylene Glycol/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 from HEMA (hydroxyethyl methacrylate) and a polyurethane segment. It is designed to create a durable, flexible film on the skin or hair.
How it works
When applied, the copolymer molecules link together as the solvent evaporates, forming a continuous, water-resistant film. This film physically locks in pigments and other ingredients, improving wear time and preventing smudging or fading.
Pros
Long-lasting wear
Helps makeup stay put for 12+ hours without touch-ups, ideal for events or long days.
Water-resistant
Forms a barrier that resists sweat, humidity, and light water exposure, reducing smudging.
Cons and cautions
Can feel tight
The film may create a slight pulling sensation on dry or mature skin, which some find uncomfortable.
Requires double cleansing
Water-resistant films often need an oil-based cleanser or micellar water to fully remove, adding a step to your routine.
Best for
- People who want long-wearing foundation or eyeliner
- Those with oily or combination skin who need oil control
Use caution if
- Those with very dry or dehydrated skin who dislike a tight feeling
- Anyone who prefers water-only makeup removal
Usage tips
Safety summary
Bis-HEMA Poly(1,4-butanediol)-14/IPDI Copolymer is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential. Some individuals may experience a tight or dry sensation, but no serious safety concerns have been reported.
Research notes
There is limited peer-reviewed research specifically on this copolymer, but it is structurally similar to other polyurethane film-formers that have been evaluated for safety by the Cosmetic Ingredient Review (CIR) panel. The CIR has deemed related polyurethane polymers safe for use in cosmetics.
Common label clues
- Typical concentration
- 1–10% in most formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical concentrations.
- Common uses
- Long-wear foundations, Waterproof eyeliners, Lip products, Sunscreens
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate significantly.
Good to know
- This polymer is often listed under trade names like 'Polyurethane-14' in ingredient lists.
- It is commonly found in '24-hour' or 'all-day' wear makeup formulas.
- Despite its synthetic nature, it is generally considered safe for most skin types.
Common questions
What is Bis-HEMA Polybutylene Glycol/IPDI Copolymer in beauty products?
This is a man-made plastic-like ingredient that forms a thin, flexible film on your skin. It helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, invisible shield that holds your foundation or eyeliner in place. Because it's a polymer, it can sometimes feel a bit tight or dry on the skin, especially if you have a dry skin type.
What does Bis-HEMA Polybutylene Glycol/IPDI Copolymer do in a beauty product?
When applied, the copolymer molecules link together as the solvent evaporates, forming a continuous, water-resistant film. This film physically locks in pigments and other ingredients, improving wear time and preventing smudging or fading.
Is Bis-HEMA Polybutylene Glycol/IPDI Copolymer safe for most people?
Bis-HEMA Poly(1,4-butanediol)-14/IPDI Copolymer is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential. Some individuals may experience a tight or dry sensation, but no serious safety concerns have been reported.
Who should be careful with Bis-HEMA Polybutylene Glycol/IPDI Copolymer?
Those with very dry or dehydrated skin who dislike a tight feeling Anyone who prefers water-only makeup removal
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.