Ingredient review

Ammonium Ethylene/MA Copolymer

INCI: AMMONIUM ETHYLENE/MA COPOLYMER

A safe, synthetic film-former that helps makeup and sunscreen stay put without clogging pores.

beautyskincarefilm-former

In plain English

This ingredient is a synthetic polymer that forms a thin, flexible film on your skin or hair. Think of it like an invisible, breathable shield that helps other ingredients (like sunscreen or foundation) stay in place longer, resist water and sweat, and feel smooth. It's commonly found in long-wear makeup, sunscreens, and setting sprays.

Quick decision guide

Useful, but context matters

Ammonium Ethylene/MA 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Ammonium Ethylene/MA Copolymer.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Ammonium Ethylene/MA Copolymer is a synthetic polymer made from ethylene and maleic anhydride, neutralized with ammonium. It's a white powder that is dissolved in water to create a clear, slightly viscous solution used in cosmetics.

How it works

When applied, the water evaporates and the polymer chains link together to form a continuous, flexible film on the skin or hair. This film helps other ingredients (like pigments or UV filters) adhere better, improves water resistance, and can also control the thickness of a product.

Pros

Boosts product longevity

Helps makeup and sunscreen stay on longer, reducing the need for frequent reapplication.

Water-resistant without heavy feel

Provides a flexible, breathable film that resists water and sweat without feeling heavy or sticky.

Cons and cautions

Can feel drying on some skin

The film may create a slight tightening sensation, which can be uncomfortable for those with very dry skin.

Synthetic ingredient

Not natural or biodegradable, which may be a concern for environmentally conscious consumers.

Best for

  • Anyone wanting long-lasting makeup or sunscreen
  • People with oily or combination skin who prefer a matte finish

Use caution if

  • Those with very dry or dehydrated skin who may find film-formers uncomfortable

Usage tips

Use a gentle, oil-based cleanser or micellar water to fully remove products containing film-formers.
If you have dry skin, pair with a hydrating serum or moisturizer underneath to minimize any tight feeling.

Safety summary

Ammonium Ethylene/MA Copolymer has a strong safety profile with low irritation and comedogenic potential. It is well-tolerated by most skin types and is not associated with significant health concerns.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel and other regulatory bodies support its safe use in cosmetics. Research focuses on its film-forming properties and compatibility with other ingredients.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
Common uses
Sunscreens, Foundations, Mascaras, Setting Sprays, Hair Styling Products
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is not classified as a microplastic and is generally considered low risk for aquatic environments at current usage levels.

Good to know

  • This ingredient is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use concentrations.
  • It is often used in combination with other film-formers to fine-tune the feel and durability of a product.

Common questions

What is Ammonium Ethylene/MA Copolymer in beauty products?

This ingredient is a synthetic polymer that forms a thin, flexible film on your skin or hair. Think of it like an invisible, breathable shield that helps other ingredients (like sunscreen or foundation) stay in place longer, resist water and sweat, and feel smooth. It's commonly found in long-wear makeup, sunscreens, and setting sprays.

What does Ammonium Ethylene/MA Copolymer do in a beauty product?

When applied, the water evaporates and the polymer chains link together to form a continuous, flexible film on the skin or hair. This film helps other ingredients (like pigments or UV filters) adhere better, improves water resistance, and can also control the thickness of a product.

Is Ammonium Ethylene/MA Copolymer safe for most people?

Ammonium Ethylene/MA Copolymer has a strong safety profile with low irritation and comedogenic potential. It is well-tolerated by most skin types and is not associated with significant health concerns.

Who should be careful with Ammonium Ethylene/MA Copolymer?

Those with very dry or dehydrated skin who may find film-formers uncomfortable

Research sources

Cosmetic Ingredient Review (CIR) - Safety AssessmentOpenPubChem - Ammonium Ethylene/MA CopolymerOpen

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.