... molecular weight: 3500-4500 PEG200,300,400,4000,6000,8000,20000 Polyethylene glycol(PEG) 4000Average molecular weight: 3500- ... 4500PEG200,300,400,4000,6000,8000,20000Appearance: White solid powder Freezing point: 50-54 ... -001Tel: 0086-551-4846007Fax: 0086-551-4846082 Polyethylene glycol(PEG) 4000