Polyquaternium-55

What is Polyquaternium-55?

Polyquaternium-55 is a synthetic cationic copolymer made from acrylamide and diallyldimethylammonium chloride. This water-soluble polymer belongs to the polyquaternium family, widely used in hair care cosmetics, especially styling products such as hairsprays, gels, mousses, and conditioners. Its positively charged structure enables strong adhesion to the negatively charged hair surface, forming a thin, invisible film. This film provides style retention by stiffening hair slightly while maintaining flexibility, resisting humidity, and reducing flyaways. Unlike rigid fixatives, it delivers a natural look with durability, improving overall hair manageability during wear. In formulations, it typically appears in leave-on or rinse-off products at levels supporting effective performance without 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:

Hair fixative
Provides style hold by forming a film on hair, helping maintain shape, reduce frizz, and improve durability in sprays, gels, and mousses.
Hair fixing
Improves style retention by depositing film-forming polymers that hold hair in place while balancing stiffness, flexibility, and humidity resistance.

Benefits

Offers reliable style hold for various hairstyles.

Helps control frizz and static for smoother appearance.

Resists humidity to extend style longevity.

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 flexible hold in styling products.
Those with rare sensitivity to quaternary ammonium compounds.
People with hair prone to frizz in humid environments.
People preferring product-free hair routines.
Users wanting balanced stiffness and movement in hair.
Individuals avoiding synthetic polymers in cosmetics.

Safety Notes

  • Considered safe for cosmetic use by expert reviews.
  • Shows low potential for skin or eye irritation in assessments.

Frequently Asked Questions about Polyquaternium-55

What does Polyquaternium-55 do in hair products?

It forms a flexible film on hair for style hold, frizz reduction, and humidity protection.

Is Polyquaternium-55 safe for regular use?

Expert panels affirm its safety in cosmetics at typical concentrations.

Does it clog pores?

Rated non-comedogenic, suitable for acne-prone skin.