Molecular Weight: The MW of PEG portion is 44 (the molecular mass of one repeating PEG unit) multiplied by the number of PEG repeating units, such as 4 in PEG4, 6 in PEG 6 or 12 in PEG12.
Solubility: Soluble in chloroform, methylene chloride, DMF, DMSO, and less soluble in alcohol, toluene, ether.
Storage condition: PEG product shall be stored in the original form as received in a freezer at -20C or lower for long term storage. Stock solution of PEG reagents that do not contain oxygen or moisture sensitive functional groups may be temporarily stored in a refrigerator or ambient temperature for multiple days. Stock solution should avoid repeated freeze-and-thaw cycles. See Documents section for detailed storage and handling conditions.