A circulation type apparatus was used to obtain vapor-liquid equilibrium data. Results are given at three temperatures for the difluoromethane (HFC-32) + 1-chloro-1,1-difluoroethane (HCFC-142b) and for the difluoromethane + 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123) binary systems. Results are well represented with the Peng-Robinson equation of state (P-R EOS). (C) 1998 Elsevier Science B.V. All rights reserved.