What it is
Polyethylene is a type of plastic that is biodegradable.
What it does
Polyethylene has several functions in products. It can thicken the oily parts of cosmetics, dilute other solids, and hold the ingredients of pressed products together. It also prevents the oily and water parts of products from separating.
In addition, small beads of Polyethylene are used in many scrubs as exfoliants. And when used in oral care products, it cleans the mouth and polishes the teeth.
Polyethylene is generally considered to be safe.