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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