What it is
Ethylene/Propylene Copolymer is a synthetic hydrocarbon polymer made from ethylene and propylene units. In cosmetics it thickens and structures oil phases, which makes it especially useful in sun sticks and balms where a firm yet glide-able texture is needed. It also contributes to a smooth application and helps bind the formula together.
Safety & warnings
As a large, inert polymer it is generally considered non-irritating and non-sensitizing at cosmetic use levels.
Origin & sourcing
Synthetic; produced by copolymerizing ethylene and propylene.
Questions everyone asks
Why is it used in sun sticks?
It structures and thickens the oil phase, giving sticks and balms a firm but smooth, glide-able texture.
Is it the same as a wax?
It is a synthetic hydrocarbon polymer used for structure and thickening; it serves a similar role to waxes in giving the product body.