Octadecene/Ma Copolymer

What is Octadecene/Ma Copolymer?

Octadecene/MA Copolymer is a synthetic polymer created by combining octadecene, a long-chain hydrocarbon derived from petroleum sources, with maleic anhydride, a compound from maleic acid. This results in a versatile film-forming agent commonly used in cosmetics like sunscreens, makeup, hair sprays, and moisturizers. In formulations, it works by depositing a thin, flexible layer on the skin or hair surface, enhancing product adherence and resistance to water or rubbing. It also strengthens emulsion structures by increasing viscosity and preventing ingredient separation, ensuring even texture and prolonged shelf stability. Its hydrophobic nature helps lock in other actives while allowing breathability, making it ideal for long-wear and protective cosmetics without heaviness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Emulsion stabilizer
Improves emulsion robustness by preventing droplet coalescence and phase separation, often by thickening, structuring, or strengthening the interfacial layer.
Film former
Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Stabilising
Improves physical and/or chemical stability (e.g., preventing separation, precipitation, or degradation) to keep performance consistent over shelf life.

Benefits

Helps maintain product stability by preventing separation in creams and lotions.

Forms a flexible barrier that improves makeup longevity and water resistance.

Enhances texture for smoother application and better spreadability.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking long-lasting makeup or sunscreen protection.
Those with known sensitivities to synthetic polymers.
Users of emulsion-based products like moisturizers for consistent performance.
Individuals preferring fully natural or minimalist formulations.
People wanting improved product texture without greasiness.
People experiencing irritation from film-forming ingredients in patch tests.

Safety Notes

  • Rated low hazard by major cosmetic safety databases.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Octadecene/Ma Copolymer

Is Octadecene/MA Copolymer safe for daily use?

Yes, cosmetic safety assessments deem it safe at typical concentrations.

Does it cause breakouts?

It has a comedogenic rating of zero, suitable for acne-prone skin.

What products contain it?

Common in sunscreens, hair styling aids, and foundation for stability.