Density　and　viscosity　data　of　pure　3-chloro-4-fluoronitrobenzene　and　3-chloro-2-fluoronitrobenzene　were　obtained　in　temperature　range　from　318.15　K　to　348.15　K　at　the　local　atmospheric　pressure　of　99.7　kPa.　The　value　of　corresponding　saturated　vapour　pressure　of　two　isomers　were　determined　in　the　temperature　range　of　409　K　to　517　K.　The　relationship　between　temperature　and　density　can　be　well　correlated　by　the　linear　equation.　The　viscosity　data　was　well　described　by　the　Litovitz,　Ghatee,　VFT,　and　Andrade　equations,　and　the　calculated　value　by　the　VFT　equation　is　consistent　with　the　measured　data.　Both　the　Antoine　and　Riedel　equations　can　accurately　describe　the　relationship　between　saturated　vapour　pressure　and　temperature　of　3-chloro-4-fluoronitrobenzene　and　3-chloro-2-fluoronitrobenzene,　which　can　meet　the　requirements　for　chemical　design.　In　addition,　the　thermal　expansion　coefficient　was　determined　based　on　the　density　data,　and　the　molar　vaporisation　enthalpy　of　two　isomers　was　evaluated　using　the　Clausius-Clapeyron　equation.　(C)　2020　Elsevier　Ltd.