IP 445: Determination of the cloud point of petroleum products - Automatic linear cooling rate method

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  • Method adopted/last revised:
  • Method reapproved: 2021
  • Status: Current
  • First printed in STM books:

This standard specifies a procedure for the determination of the cloud point of petroleum products and biodiesel fuels that are transparent in layers 40 mm in thickness. It employs a microprocessor- controlled automatic instrument using a linear cooling rate, with an optical device to record the appearance of the cloud point. The test method is applicable to products with cloud points in the range 60°C to +49°C, however the range of temperatures included in the 1997 interlaboratory cooperation test program only covered the temperature range of -56°C to +34°C. The test method produces results to the nearest 0,1°C, which when rounded to the nearest lower integer, show no significant relative bias to the results obtained by the manual procedure IP 219/ASTM D2500, but with improved precision.

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