PEG-150/Decyl Alcohol/Smdi Copolymer

PEG / Ethoxylated

What is PEG-150/Decyl Alcohol/Smdi Copolymer?

PEG-150/Decyl Alcohol/SMDI Copolymer is a synthetic polymer derived from polyethylene glycol with 150 ethylene oxide units, decyl alcohol (a fatty alcohol from coconut or palm), and saturated methylene diphenyl diisocyanate (SMDI), a linking agent forming polyurethane-like structures. Primarily found in color cosmetics such as mascaras, eyeliners, and lip products, as well as sunscreens and hair styling formulations. It works by depositing a thin, flexible, water-resistant film on skin or hair upon drying, enhancing adherence and durability. Additionally, its network structure traps pigments and particles to prevent settling, while adjusting flow properties for even application and stability during storage. This multifunctional role supports product performance without altering skin's natural barrier.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 3 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

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.
Suspending agent
Keeps insoluble particles (pigments, beads, actives) evenly dispersed by increasing viscosity or forming a network, preventing settling and separation.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Enhances makeup longevity with a protective, water-resistant layer.

Maintains even distribution of pigments and actives for consistent coverage.

Improves texture and spreadability for user-friendly application.

Who It's For

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

Who May Benefit Who Should Avoid
Users seeking durable, smudge-proof cosmetics.
People sensitive to polyethylene glycol derivatives.
Individuals using products with suspended particles like sunscreens.
Individuals avoiding ethoxylated ingredients.
Those preferring stable formulations with controlled thickness.
Users preferring mineral or natural-only products.

Safety Notes

  • Considered safe for cosmetic use by regulatory reviews with low overall hazard.
  • Potential for trace impurities common to PEG compounds, minimized in quality products.

Frequently Asked Questions about PEG-150/Decyl Alcohol/Smdi Copolymer

What products contain this ingredient?

Commonly used in mascaras, eyeliners, sunscreens, and hair styling products.

Is it safe for sensitive skin?

Generally low irritation risk, but patch test if sensitive to PEGs.

Does it affect pore appearance?

Non-comedogenic, unlikely to contribute to clogged pores.