Ingredient review

Stearylvinyl Ether/MA Copolymer

INCI: STEARYLVINYL ETHER/MA COPOLYMER

A synthetic film-former that helps products stay put and resist water, generally considered safe and non-irritating.

beautyskincarefilm-former

In plain English

This is a synthetic ingredient that creates a thin, flexible film on your skin or hair. Think of it like a clear, invisible shield that helps other ingredients stay in place and resist water or sweat. It's often used in sunscreens to keep them effective longer, and in long-wear makeup to prevent smudging.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Stearylvinyl Ether/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 Stearylvinyl Ether/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

A synthetic copolymer made from stearyl vinyl ether and maleic anhydride. It is a large molecule that forms a film when applied to the skin or hair.

How it works

When applied, the copolymer dries to form a continuous, flexible film on the surface. This film helps lock in other ingredients, improves water resistance, and gives a smooth, even feel. It also helps control the thickness and spreadability of the product.

Pros

Boosts water resistance

Helps sunscreens and makeup stay effective longer, even when you sweat or swim.

Improves product feel

Creates a smooth, even layer that makes products glide on and feel lightweight.

Cons and cautions

Synthetic origin

Not natural or biodegradable, which may be a concern for eco-conscious users.

Potential tackiness

In high concentrations, it can leave a slightly sticky or heavy feel on the skin.

Best for

  • Anyone wanting longer-lasting sunscreen or makeup
  • People with oily skin who prefer water-resistant products

Use caution if

  • Those who strictly avoid synthetic polymers
  • Individuals with very sensitive skin who react to film-formers (rare)

Usage tips

Apply water-resistant products evenly and reapply as directed, especially after swimming or sweating.
Use a gentle oil-based cleanser or micellar water to fully remove products containing this film-former.

Safety summary

Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns at typical concentrations.

Research notes

Limited independent studies, but widely used in cosmetics with a long history of safe use. Safety assessments by industry panels support its use.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. No known restrictions at typical use levels.
Common uses
Sunscreens, Water-resistant lotions, Long-wear makeup
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to accumulate in the environment.

Good to know

  • This ingredient is often found in combination with other film-formers for enhanced performance.
  • It is considered safe by major regulatory bodies when used in typical cosmetic concentrations.

Common questions

What is Stearylvinyl Ether/MA Copolymer in beauty products?

This is a synthetic ingredient that creates a thin, flexible film on your skin or hair. Think of it like a clear, invisible shield that helps other ingredients stay in place and resist water or sweat. It's often used in sunscreens to keep them effective longer, and in long-wear makeup to prevent smudging.

What does Stearylvinyl Ether/MA Copolymer do in a beauty product?

When applied, the copolymer dries to form a continuous, flexible film on the surface. This film helps lock in other ingredients, improves water resistance, and gives a smooth, even feel. It also helps control the thickness and spreadability of the product.

Is Stearylvinyl Ether/MA Copolymer safe for most people?

Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns at typical concentrations.

Who should be careful with Stearylvinyl Ether/MA Copolymer?

Those who strictly avoid synthetic polymers Individuals with very sensitive skin who react to film-formers (rare)

Research sources

CosIng - European Commission DatabaseOpenPubChem - Stearyl Vinyl Ether/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.