Polyimide-1

What is Polyimide-1?

Polyimide-1 is a synthetic thermoplastic polymer from the polyimide class, featuring rigid imide groups in its structure for thermal stability and mechanical strength. Originally engineered for industrial uses like electronics, it transitioned to cosmetics for its film-forming prowess. Commonly found in long-wear makeup such as foundations, eyeliners, lip colors, sunscreens, and hair styling sprays or gels. Upon application and solvent evaporation, it creates a sheer, elastic film on skin or hair surfaces. This layer anchors pigments and actives, boosting resistance to rubbing, sweat, sebum, and humidity while maintaining flexibility to avoid cracking or stiffness. Its compatibility with various formulations supports extended product performance without heavy buildup.

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

Enhances makeup durability by forming a protective film against transfer and smudging.

Boosts water and oil resistance in sunscreens and color cosmetics.

Delivers flexible hold in hair products to maintain styles longer.

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 desiring all-day makeup that withstands daily activities.
Those with rare sensitivities to synthetic polymers.
Individuals with oily skin needing transfer-proof finishes.
Individuals preferring mineral or plant-based formulas only.
People styling hair for humidity-prone environments.
Users experiencing discomfort from film-forming agents.

Safety Notes

  • Considered low hazard with minimal skin penetration potential.
  • Non-comedogenic, unlikely to clog pores based on assessments.

Frequently Asked Questions about Polyimide-1

What does Polyimide-1 do in cosmetics?

It forms a flexible film to improve wear resistance, hold, and performance in makeup and hair products.

Is Polyimide-1 safe for skin?

Evaluated as low hazard and suitable for use in rinse-off and leave-on cosmetics.

Does it work on all skin types?

Its non-comedogenic nature suits most, though test for personal tolerance.