Polyacrylic Acid

What is Polyacrylic Acid?

Polyacrylic acid is a synthetic, high-molecular-weight homopolymer made from acrylic acid monomers through free-radical polymerization. This water-soluble, viscous liquid or powder appears in various cosmetic categories, including cleansers, moisturizers, sunscreens, and styling products. It works by absorbing large amounts of water and swelling into clear, voluminous gels, particularly after neutralization with bases to form carboxylate salts. This swelling action enables precise viscosity control, preventing ingredient separation in emulsions, binding powders or solids for structural integrity, and depositing thin, flexible films on skin or hair that resist water and improve product adherence without stickiness. Its pH-responsive nature allows formulators to tailor textures from thin lotions to thick gels, enhancing sensory appeal and formula durability across product types.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 2 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Binder
Helps hold solid ingredients together to form cohesive tablets, compacts, or sticks, improving pressability, integrity, and wear of the finished product.
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.
Binding
Provides cohesion by helping ingredients stick together, improving the strength and integrity of pressed powders, tablets, or solid bars.

Benefits

Enhances product texture for easy spreading and comfortable application.

Maintains emulsion stability to prevent separation and extend shelf life.

Forms sheer films that boost water resistance and wear in protective formulas.

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 of gel cleansers seeking non-dripping, stable consistencies.
People with rare sensitivities to acrylic polymers.
Individuals preferring smooth, thickened lotions and creams.
Individuals with compromised skin barriers prone to irritation from acids.
Those applying water-resistant sunscreens or makeup for extended hold.
Users preferring entirely natural or polymer-free formulations.

Safety Notes

  • Considered safe for cosmetic use by regulatory expert panels.
  • Low potential for comedogenicity or pore clogging.

Frequently Asked Questions about Polyacrylic Acid

What does polyacrylic acid do in cosmetics?

It controls thickness, stabilizes mixtures, binds ingredients, and forms protective films for better product performance.

Is polyacrylic acid safe for skin?

Expert reviews affirm its safety in typical cosmetic levels with low hazard ratings.

Does it cause acne?

It has a comedogenic rating of zero, making it unlikely to clog pores.