What is Polyethylene Glycol? Polyethylene Glycol comes in PEG 200, PEG 300 and PEG 400 is polyethylene glycol or commonly called PEG. ChemWorld stocks repackaged PEG 400 USP 55 Gallon and 1 Gallon containers. Can I order PEG 200, PEG 300, and PEG 400? Yes, we sell direct to all end users.