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ASTM D5771-10

Historical Revision

Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Optical Detection Stepped Cooling Method)

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1.1 This test method covers the description of 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 an optical device.

1.2 This test method covers the range of temperatures from 60 to +49°C with temperature resolution of 0.1°C, however, the range of temperatures included in the 1997 interlaboratory cooperative test program only covered the temperature range of 56 to +34°C.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This 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.

For petroleum products and biodiesel fuels, the cloud point is an index of the lowest temperature of their 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 D2500. Refer to 12.2.

This test method is more precise than Test Method D2500.

Note 1—According to interlaboratory examination, the reproducibility of this test method has been found to be more precise than Test Method D2500.

SDO ASTM: ASTM International
Document Number D5771
Publication Date May 1, 2010
Language en - English
Page Count 6
Revision Level 10
Supercedes
Committee D02.07
Publish Date Document Id Type View
Jan. 1, 2021 D5771-21 Revision
June 1, 2020 D5771-20 Revision
May 1, 2017 D5771-17 Revision
April 1, 2015 D5771-15 Revision
April 15, 2012 D5771-12 Revision
May 1, 2010 D5771-10 Revision
July 1, 2005 D5771-05 Revision
April 1, 2004 D5771-04 Revision
July 10, 2003 D5771-03 Revision
April 10, 2002 D5771-02 Revision
Jan. 1, 1995 D5771-95 Revision