“Some salting-in and 'intermediate' salts (NaSCN, NaI, NaBr, NaCl , LiCl, KCl, and RbCl) inhibited the crystallization of PEG 7500 in frozen solutions.”
“Thermal analysis of an aqueous PEG 3000 solution showed a eutectic PEG crystallization exotherm at approximately -47 degrees C and a subsequent PEG crystal melting endotherm at -14.9 degrees C. Addition of sodium chloride prevented the PEG crystallization in the freeze-concentrated solution surrounding ice crystals.”