Ingredient review

Sodium MA/Diisobutylene Copolymer

INCI: SODIUM MA/DIISOBUTYLENE COPOLYMER

A synthetic film-forming polymer that helps skincare products feel silky and last longer on the skin.

beautyskincarefilm former

In plain English

Sodium MA/Diisobutylene Copolymer is a man-made ingredient that forms a thin, invisible film on your skin. This film helps other ingredients stay put, gives a smooth feel, and can reduce shine. It's often used in products that want a matte or velvet finish, like primers or sunscreens.

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

Sodium MA/Diisobutylene 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 Sodium MA/Diisobutylene 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 maleic acid and diisobutylene, designed to create a flexible film on the skin.

How it works

When applied, the copolymer dries to form a lightweight, breathable film that holds active ingredients in place and reduces the appearance of pores or fine lines by smoothing the skin's surface.

Pros

Long-lasting finish

Helps skincare and makeup stay put for hours, reducing the need for touch-ups.

Smooth texture

Creates a silky, velvet feel on the skin that can blur pores and fine lines.

Cons and cautions

Potential tightness

On very dry skin, the film may feel slightly tight or uncomfortable.

Synthetic origin

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

Best for

  • People with oily or combination skin
  • Those who want a long-lasting, matte makeup look

Use caution if

  • Individuals with very dry or dehydrated skin
  • Those who prefer only natural ingredients

Usage tips

Apply to damp skin for a more flexible film
Use sparingly if you have dry skin, or layer with a hydrating serum

Safety summary

Sodium MA/Diisobutylene Copolymer is considered safe for cosmetic use with low irritation and comedogenic potential. It is well-tolerated by most skin types.

Research notes

Limited peer-reviewed studies specifically on this copolymer, but it is structurally similar to other safe film-forming polymers used in cosmetics. 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 EU, US, and other major markets. No known restrictions at typical concentrations.
Common uses
Moisturizers, Sunscreens, Primers, Makeup
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in low concentrations and is not known to bioaccumulate.

Good to know

  • This ingredient is often used in combination with other film formers for better spreadability
  • It is considered safe for most skin types by cosmetic safety panels

Common questions

What is Sodium MA/Diisobutylene Copolymer in beauty products?

Sodium MA/Diisobutylene Copolymer is a man-made ingredient that forms a thin, invisible film on your skin. This film helps other ingredients stay put, gives a smooth feel, and can reduce shine. It's often used in products that want a matte or velvet finish, like primers or sunscreens.

What does Sodium MA/Diisobutylene Copolymer do in a beauty product?

When applied, the copolymer dries to form a lightweight, breathable film that holds active ingredients in place and reduces the appearance of pores or fine lines by smoothing the skin's surface.

Is Sodium MA/Diisobutylene Copolymer safe for most people?

Sodium MA/Diisobutylene Copolymer is considered safe for cosmetic use with low irritation and comedogenic potential. It is well-tolerated by most skin types.

Who should be careful with Sodium MA/Diisobutylene Copolymer?

Individuals with very dry or dehydrated skin Those who prefer only natural ingredients

Research sources

Cosmetic Ingredient Review (CIR) Safety AssessmentOpenEuropean Chemicals Agency (ECHA) DatabaseOpenPersonal Care Council - Ingredient InfoOpen

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.