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ASTM D5773-07

Historical Revision

Standard Test Method for Cloud Point of Petroleum Products (Constant Cooling Rate Method)

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1.1 This test method covers 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 constant cooling rate.

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 the standard. The values given in parentheses are for information only.

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.

The cloud point of petroleum products and biodiesel fuels 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 a 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 are equivalent to Test Method D 2500.

Note 1—This is based on the Test Method D 2500 equivalent cloud point in which the 0.1°C result is rounded to the next lower integer.

This test method determines the cloud point in a shorter period of time than Test Method D 2500.

Note 2—In cases of samples with cloud points near ambient temperatures, time savings may not be realized.

This test method eliminates most of the operator time required of Test Method D 2500.

This test method does not require the use of a mechanical refrigeration apparatus.

Note 3—In certain cases of high ambient temperature, a source of cooling water may be required to measure low temperature cloud points (see 7.1).

SDO ASTM: ASTM International
Document Number D5773
Publication Date Dec. 1, 2007
Language en - English
Page Count 7
Revision Level 07
Supercedes
Committee D02.07
Publish Date Document Id Type View
Jan. 1, 2021 D5773-21 Revision
June 1, 2020 D5773-20 Revision
May 1, 2017 D5773-17E01 Revision
May 1, 2017 D5773-17 Revision
Dec. 1, 2015 D5773-15A Revision
April 1, 2015 D5773-15 Revision
May 1, 2010 D5773-10 Revision
Dec. 1, 2007 D5773-07 Revision
June 15, 2005 D5773-05 Revision
April 1, 2004 D5773-04 Revision
July 10, 2003 D5773-03 Revision
April 10, 2002 D5773-02 Revision
Jan. 1, 1995 D5773-95 Revision