Polyester-1

What is Polyester-1?

Polyester-1 is a synthetic resin from the polyester class of polymers, featuring repeating ester units in its molecular structure. Derived from controlled polymerization of alcohol and acid monomers, it yields a clear, flexible material optimized for personal care formulations. Commonly incorporated into hair styling aids like sprays, gels, and mousses, it also features in sunscreens, foundations, and nail coatings. Functionally, it spreads evenly upon application, drying to create a sheer, adherent sheath over hair fibers or skin. This sheath imparts mechanical strength, shielding against environmental factors such as moisture and friction while preserving natural movement. Its tunable viscosity and compatibility with other ingredients enable customized performance in water-resistant or long-lasting products, contributing to product integrity without compromising comfort.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 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.
Hair fixative
Provides style hold by forming a film on hair, helping maintain shape, reduce frizz, and improve durability in sprays, gels, and mousses.

Benefits

Provides durable style hold in hair products by forming flexible films.

Enhances water resistance and longevity in sunscreens and makeup.

Helps control frizz and maintain hair shape throughout the day.

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 styling hair in humid conditions for reliable hold.
Those with rare sensitivities to synthetic polymers.
Users seeking transfer-proof makeup or sunscreens.
Individuals preferring strictly natural or plant-based formulations.
People with hair prone to losing shape needing fixation support.
People who experience buildup from film-forming agents.

Safety Notes

  • Considered safe for cosmetic use in concentrations typically employed.
  • Non-comedogenic, posing low risk of pore clogging.

Frequently Asked Questions about Polyester-1

What products commonly contain Polyester-1?

Hair sprays, gels, mousses, sunscreens, and long-wear makeup.

Is Polyester-1 suitable for sensitive skin?

It carries a low irritation potential based on safety reviews.

Does Polyester-1 make hair stiff?

It forms flexible films for natural movement and hold.