Polyethylene ek synthetic polymer hai jo cosmetics mein mainly thickener, binder, aur film former ke taur par use hota hai. Pehle isko exfoliating microbeads mein bhi use karte the but ab environmental concerns ki wajah se mostly phase out ho gaya hai. Ye skin par bilkul safe aur non-reactive hota hai, kisi bhi adverse effect nahi karta.