R290Pure propane ,Mainly it is a substitute of R22,R502 R290Pure propane ,Mainly it is a substitute of R22,R502 Molecular weight44.9BP,-42.2Critical temperature ,96.67Critical pressure ,Mpa4.24Density of saturated liquid25 ,(g/cm 3 )0.58Specific heat of liquid 25 ,[KJ/(Kg· )]1.64ODP0GWP0.01Critical density,g/cm 30.220Vaporization heat under BP,KJ/Kg410.5