Ingredient review
Bis-Pentaerythritol Triacrylate/SMDI Copolymer
INCI: BIS-PENTAERYTHRITOL TRIACRYLATE/SMDI COPOLYMER
A synthetic film-former that helps makeup and sunscreen stay put longer, but may feel tight or heavy on very dry skin.
In plain English
This is a man-made polymer that forms a thin, flexible film on your skin. Think of it like a clear, breathable plastic wrap that helps makeup and sunscreen resist water, sweat, and rubbing. It's commonly found in long-wear foundations, waterproof eyeliners, and sport sunscreens. While generally safe and non-irritating, it can feel a bit tight or heavy if you have very dry skin.
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-Pentaerythritol Triacrylate/SMDI 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-Pentaerythritol Triacrylate/SMDI 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 pentaerythritol triacrylate with saturated methylene diphenyl diisocyanate (SMDI). It belongs to the acrylate family of film-formers and is designed to be flexible and water-resistant.
How it works
When applied, the polymer chains spread across the skin and link together as the solvent evaporates, forming a continuous, flexible film. This film physically blocks water and oil from reaching the product underneath, helping pigments and UV filters stay in place longer.
Pros
Long-lasting wear
Helps makeup and sunscreen resist water, sweat, and rubbing, so you don't have to reapply as often.
Smooth finish
Creates an even, non-greasy film that can help makeup apply more smoothly and stay in place.
Cons and cautions
Potential tightness
On very dry skin, the film can feel tight or uncomfortable, especially if layered over other products.
Removal difficulty
Requires an oil-based cleanser or micellar water to fully remove; leftover residue may contribute to clogged pores.
Best for
- People who want long-wearing makeup or water-resistant sunscreen
- Those with normal to oily skin looking for a matte finish
Use caution if
- Individuals with very dry or dehydrated skin who find film-formers uncomfortable
- Anyone who prefers lightweight, easily removable products
Usage tips
Safety summary
Generally recognized as safe for topical use at typical concentrations. Low irritation and sensitization potential. No known systemic toxicity concerns from dermal exposure.
Research notes
Limited peer-reviewed studies specific to this copolymer, but the broader acrylate family has been well-studied for safety. Cosmetic Ingredient Review (CIR) has reviewed similar acrylate copolymers and found them safe as used.
Common label clues
- Typical concentration
- 1-10% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and other major markets. No known restrictions at typical use levels.
- Common uses
- Long-wear foundations, Water-resistant sunscreens, Waterproof eyeliners, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may persist in the environment. Some jurisdictions are evaluating microplastic regulations that could affect future use.
Good to know
- This ingredient is often combined with silicones to improve spreadability and reduce tackiness.
- It is considered safe for use in cosmetics by major regulatory bodies at typical concentrations.
Common questions
What is Bis-Pentaerythritol Triacrylate/SMDI Copolymer in beauty products?
This is a man-made polymer that forms a thin, flexible film on your skin. Think of it like a clear, breathable plastic wrap that helps makeup and sunscreen resist water, sweat, and rubbing. It's commonly found in long-wear foundations, waterproof eyeliners, and sport sunscreens. While generally safe and non-irritating, it can feel a bit tight or heavy if you have very dry skin.
What does Bis-Pentaerythritol Triacrylate/SMDI Copolymer do in a beauty product?
When applied, the polymer chains spread across the skin and link together as the solvent evaporates, forming a continuous, flexible film. This film physically blocks water and oil from reaching the product underneath, helping pigments and UV filters stay in place longer.
Is Bis-Pentaerythritol Triacrylate/SMDI Copolymer safe for most people?
Generally recognized as safe for topical use at typical concentrations. Low irritation and sensitization potential. No known systemic toxicity concerns from dermal exposure.
Who should be careful with Bis-Pentaerythritol Triacrylate/SMDI Copolymer?
Individuals with very dry or dehydrated skin who find film-formers uncomfortable Anyone who prefers lightweight, easily removable products
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.