Polyethylene

Benefits
CleansingSoftening

What is Polyethylene?

Polyethylene is a synthetic polymer produced by polymerizing ethylene gas under high pressure and temperature, resulting in a durable, lightweight plastic material. In cosmetics, it serves multiple purposes across product categories like cleansers, makeup, sunscreens, and oral care items. As fine particles or beads, it acts as an abrasive for mechanical exfoliation, polishing away dead skin cells. In higher concentrations, it forms thin, flexible films on the skin or hair to enhance product adherence, water resistance, and smoothness. It also stabilizes emulsions by increasing viscosity, binds powders into solid forms, and bulks formulations for better spreadability. Due to its large molecular size, it remains on the surface without penetrating the skin, providing physical rather than chemical effects.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Abrasive
Provides gentle mechanical exfoliation and polishing, helping remove surface dead skin cells and improve smoothness and slip in scrubs and cleansers.
Adhesive
Improves adhesion so the product or film sticks to skin, hair, or nails; helps bind layers together in patches, nail products, and long-wear formulas.
Binder
Helps hold solid ingredients together to form cohesive tablets, compacts, or sticks, improving pressability, integrity, and wear of the finished product.
Bulking agent
Increases mass/volume to build structure and improve handling, commonly used to adjust feel, spread, and cost-in-use without acting as a primary active.
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.
Oral care agent
Supports oral hygiene performance (cleaning, freshening, plaque control, sensitivity support) in toothpaste, mouthwash, and related products.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Delivers gentle mechanical cleansing by removing surface impurities and dead cells.

Enhances softening and smoothness through polishing action in scrubs and creams.

Supports long-wear formulas by forming protective films that improve adhesion and texture.

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 physical exfoliation for smoother texture in cleansers and scrubs.
Those concerned about microplastics due to environmental persistence.
Users of makeup or sunscreens wanting improved wear and water resistance.
Individuals with rare allergies to synthetic polymers.
People preferring stable, easy-to-apply products with controlled thickness.
Users preferring chemical-free or natural-only formulations.

Safety Notes

  • Rated low hazard by EWG with scores of 1 across assessments.
  • Non-comedogenic with a rating of 0, suitable for acne-prone skin.

Frequently Asked Questions about Polyethylene

Is polyethylene safe for daily use?

Yes, it is considered safe in cosmetics at typical levels, with low hazard ratings and no penetration into skin.

What products commonly contain polyethylene?

Found in exfoliating scrubs, long-wear makeup, sunscreens, toothpaste, and viscosity-adjusted creams.

Does polyethylene help with skin texture?

It provides mechanical polishing to smooth surface irregularities through gentle abrasion.