Significance and Use
For petroleum products and diesel fuels, the cloud point is an index of the lowest temperature of its utility for certain applications. Wax crystals of sufficient quantity can plug filters used in some fuel systems.
Petroleum blending operations require precise measurement of the cloud point.
This test method can determine the temperature of the test specimen at which wax crystals have formed sufficiently to be observed as a cloud, with a resolution of 0.1°C.
This test method provides results that when rounded to the next lower integer are equivalent to Test Method D 2500
This test method is more precise than Test Method D 2500
1.1 This test method describes the determination of the cloud point of petroleum products and biodiesel fuels that are transparent in layers 40 mm in thickness by an automatic instrument using a linear cooling rate.
1.2 This test method covers the range of temperatures from 60 to 49oC with temperature resolution of 0.1oC, however, the range of temperatures included in the 1997 interlaboratory cooperative test program only covered the temperature range of -56 to +34oC.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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