IP 446: Determination of the cloud point of petroleum products - Automatic constant cooling rate method

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  • Method adopted/last revised:
  • Method reapproved: 2021
  • REF/ISBN:
  • 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. The procedure employs an automatic instrument which uses the scatter of reflected light to determine the appearance of the cloud point in a test portion that is being cooled at a constant rate. The test method is applicable to products with cloud points in the range of 60°C to +49°C, however the range of temperatures included in the 1997 interlaboratory cooperative 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 bias to the results obtained by the manual procedure IP 219/ ASTM D2500, but with improved precision.

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