Ingredient review
HDI Alkyl Tartrate Copolymer
INCI: HDI/DI-C12-14 ALKYL TARTRATE/HYDROGENATED DILINOLEYL ALCOHOL COPOLYMER
A synthetic film-former that helps makeup last longer and resist water, but may feel heavy on some skin types.
In plain English
This ingredient is a man-made polymer that creates a flexible, invisible film on your skin. It's commonly added to long-wear foundations, mascaras, and lip products to help them stay put through sweat, humidity, and water. Think of it like a clear, breathable raincoat for your makeup. Because it's a large molecule, it sits on the surface and doesn't absorb into the skin, 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
HDI Alkyl Tartrate 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 HDI Alkyl Tartrate 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 hexamethylene diisocyanate (HDI), a tartrate ester, and hydrogenated dilinoleyl alcohol. It's designed to form a durable, flexible film on skin or hair.
How it works
When the product dries, the polymer chains link together to create a continuous film. This film physically locks in pigments and other ingredients, resisting transfer, water, and friction. It also helps control the viscosity (thickness) of the formula for a smooth application.
Pros
Long-lasting wear
Creates a durable film that helps makeup stay put for hours, even in humid or wet conditions.
Water-resistant
Forms a barrier that resists water and sweat, making it ideal for active lifestyles or special events.
Cons and cautions
Can feel heavy
The film may feel tight or mask-like on very dry or sensitive skin, especially in high concentrations.
Harder to remove
Because it's water-resistant, you'll likely need an oil-based or dual-phase cleanser to fully remove it without rubbing.
Best for
- Anyone wanting long-lasting, transfer-resistant makeup
- People with oily or combination skin who need extra staying power
Use caution if
- Those with very dry or dehydrated skin who prefer lightweight, breathable formulas
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Research notes
Limited independent studies on this specific copolymer, but it is structurally similar to other HDI-based film formers that have been reviewed and deemed safe by cosmetic ingredient panels (e.g., CIR).
Common label clues
- Typical concentration
- 1–10% in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical use levels.
- Common uses
- Long-wear foundations, Waterproof mascara, 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.
Good to know
- This polymer is often used in 'clean' or 'vegan' long-wear formulas as an alternative to silicone-based film formers.
- It is not water-soluble, so it won't wash off with water alone.
Common questions
What is HDI Alkyl Tartrate Copolymer in beauty products?
This ingredient is a man-made polymer that creates a flexible, invisible film on your skin. It's commonly added to long-wear foundations, mascaras, and lip products to help them stay put through sweat, humidity, and water. Think of it like a clear, breathable raincoat for your makeup. Because it's a large molecule, it sits on the surface and doesn't absorb into the skin, which keeps irritation low for most people.
What does HDI Alkyl Tartrate Copolymer do in a beauty product?
When the product dries, the polymer chains link together to create a continuous film. This film physically locks in pigments and other ingredients, resisting transfer, water, and friction. It also helps control the viscosity (thickness) of the formula for a smooth application.
Is HDI Alkyl Tartrate Copolymer safe for most people?
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Who should be careful with HDI Alkyl Tartrate Copolymer?
Those with very dry or dehydrated 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.