ASTM D5551-95(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5551 − 95 (Reapproved 2019)
Standard Test Method for
Determination of the Cloud Point of Oil
This standard is issued under the fixed designation D5551; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the cloud 4.1 This test method is intended to determine the cloud
pointofoilsusedinthesofteningandstuffingofleatherandin point of oils used in the softening and stuffing of leather, as
the manufacture of fat liquors and other softening and stuffing
well as those used in the manufacture of products for such
compounds. This test method was derived from Test Methods purpose.Thecloudpointofoilsismeasuredforthepurposeof
D97 and D2500.
quality assurance.
1.2 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
only.
5.1 Test Jar, clear cylindrical glass, flat bottom, 30- to
33.5-mm inside diameter, and 115- to 125-mm height. To
1.3 This standard does not purport to address all of the
indicate sample height the jar should be marked with a line 54
safety concerns, if any, associated with its use. It is the
6 3 mm above the inside bottom.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.2 Thermometers, having ranges shown below and con-
mine the applicability of regulatory limitations prior to use.
forming to the requirements prescribed in Specification E1 for
1.4 This international standard was developed in accor-
thermometers:
dance with internationally recognized principles on standard-
Thermometer
ization established in the Decision on Principles for the
Temperature Number
Thermometer Range ASTM IP
Development of International Standards, Guides and Recom-
High cloud and pour −38 to +50°C 5C 1C
mendations issued by the World Trade Organization Technical
Low cloud and pour −80 to +20°C 6C 2C
Barriers to Trade (TBT) Committee.
Melting point +32 to +127°C 61C 63C
5.2.1 Since separation of liquid column thermometers occa-
2. Referenced Documents
sionally occurs and may escape detection, thermometers
2.1 ASTM Standards:
should be checked immediately prior to the test and used only
D97Test Method for Pour Point of Petroleum Products
if they prove accurate within 6 1°C (for example, ice point).
D2500Test Method for Cloud Point of Petroleum Products
5.3 Cork, to fit the test jar, bored centrally for the test
and Liquid Fuels
thermometer.
E1Specification for ASTM Liquid-in-Glass Thermometers
5.4 Jacket, metal or glass, watertight, cylindrical, flat
3. Terminology
bottom, 115 mm in depth, 42- to 50-mm inside diameter. It
3.1 cloud point—that temperature, expressed as a multiple
must be supported firmly in a vertical position in the cooling
of 1°C (2°F), at which a cloud or haze of wax crystals appears bath of 5.7 so that not more than 25 mm projects out of the
at the bottom of the test jar when the oil is cooled under
cooling medium.
prescribed conditions.
5.5 Disk, cork or felt, 6 mm thick, to fit loosely inside the
jacket.
ThistestmethodisunderthejurisdictionofASTMCommitteeD31onLeather
5.6 Gasket, to fit snugly around the outside of the test jar
and is the direct responsibility of Subcommittee D31.08 on Fats and Oils. This test
and loosely inside the jacket. The gasket may be made of
method was developed in cooperation with the American Leather Chemists Assn.
(Method H18-1957).
rubber, leather, or other material that is elastic enough to cling
Current edition approved April 1, 2019. Published April 2019. Originally
to the test jar and hard enough to hold its shape. Its purpose is
approved in 1994. Last previous edition approved in 2012 as D5551–95(2012).
to prevent the test jar from touching the jacket.
DOI: 10.1520/D5551-95R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.7 Bath or Baths, maintained at prescribed temperatures
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
with a firm support to hold the jacket vertical. The required
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bath temperatures may be obtained by refrigeration if
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5551 − 95 (2019)
ture present by any suitable method, such as by filtration
through dry lintless filter paper until the oil is perfectly clear,
butmakesuchfiltrationatatemperatureofatleast14°C(25°F)
above the approximate cloud point.
7.2 Pour the clear oil into the test jar to the level mark.
7.3 Close the test jar tightly by the cork carrying the test
thermometer (Note 2). Use the high cloud and pour thermom-
eteriftheexpectedcloudpointisabove−38°C(−36°F)andthe
low cloud and pour thermometer if the expected cloud point is
below−38°C (−36°F). Adjust the position of the cork and the
thermometer so that the cork fits tightly, the thermometer and
the jar are coaxial, and the thermometer bulb is resting on the
bottom of the jar.
NOTE2—Sinceseparationofthemercuryortoluenethreadofcloudand
pour thermometers occasionally occurs, and since such separation may
otherwiseescapeimmediatedetection,itissuggestedthattheicepointsof
thethermometersbecheckedimmediatelypriortothetest.Anythermom-
eter that shows as ice point differing from 0°C (32°F) by more than 1°C
(2°F) should be further examined or recalibrated, or both, before use.
NOTE 1—All dimensions in millimetres.
7.4 Place the disk in the bottom of the jacket. Place the ring
FIG. 1 Apparatus for Cloud Point Test
gasket around the test jar, 25 mm (1 in.) from the bottom. The
disk, gasket, and inside of the jacket shall be clean and dry.
available, otherwise by suitable freezing mixtures. Freezing
Insert the test jar in the jacket.
...