Pour Point (Paperback)

High Quality Content by WIKIPEDIA articles! The pour point of a liquid is the lowest temperature at which it will pour or flow under prescribed conditions. It is a rough indication of the lowest temperature at which oil is readily pumpable. Also, the pour point can be defined as the minimum temperature of a liquid, particularly a lubricant, after which, on decreasing the temperature, the liquid ceases to flow. The specimen is cooled inside a cooling bath to allow the formation of paraffin wax crystals. At about 9oC above the expected pour point, and for every subsequent 3oC, the test jar is removed and tilted to check for surface movement. When the specimen does not flow when tilted, the jar is held horizontally for 5 secs. If it does not flow, 3oC is added to the corresponding temperature and the result is the pour point temperature.