ASTM D2532-03

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Designation:D2532–03
Standard Test Method for
Viscosity and Viscosity Change After Standing at Low
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Temperature of Aircraft Turbine Lubricants
This standard is issued under the fixed designation D2532; 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.
This standard has been approved for use by agencies of the Department of Defense.
be used at other temperatures. Viscosities may be measured and reported
1. Scope*
at other intervals as agreed by the contracting parties.
1.1 This test method covers the determination of the kine-
matic viscosity of aircraft turbine lubricants at low tempera-
4. Significance and Use
ture, and the percent change of viscosity after a 3-h and a 72-h
4.1 Aircraft turbine lubricants, upon standing at low tem-
standing period at low temperature.
peratures for prolonged periods of time, may show an increase
1.2 This test method uses the millimetre squared per second
in kinematic viscosity. This increase may cause lubrication
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(mm /s)astheunitofkinematicviscosity.Forinformation,the
problems in aircraft engines. Thus, this test method is used to
equivalent cgs unit, the centistokes, is shown in parentheses.
ensure that the kinematic viscosity does not exceed the
1.3 The values stated in SI units are to be regarded as the
maximum kinematic viscosity in certain specifications for
standard. The values given in parentheses are for information
aircraft turbine lubricants.
only.
1.4 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Viscometers, drying tubes, low-temperature bath, ther-
responsibility of the user of this standard to establish appro-
mometer, timer, secondary viscosity standard, filter, and clean-
priate safety and health practices and determine the applica-
ing supplies are described in detail in Test Method D445.
bility of regulatory limitations prior to use. For specific hazard
5.2 Viscometer—The viscometer shall meet the require-
statements, see Section 6.
ments of Test Method D445 and be of the type in which the
sample can be rerun without cleaning the viscometer. Suitable
2. Referenced Documents
holders should be used. For convenience it is recommended
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2.1 ASTM Standards:
that the viscometer size be chosen to keep the efflux time
D445 Test Method for Kinematic Viscosity of Transparent
between 200 and 1000 s.
and Opaque Liquids (and Calculation of Dynamic Viscos-
5.3 Drying Tubes—Fit the viscometer openings with drying
ity)
tubes filled with indicating silica gel, using cotton at top and
E1 Specification for ASTM Liquid-in-Glass Thermometers
bottom to hold the loosely packed desiccant in place. Provide
a cross-connection on the viscometer side of the drying tubes
3. Summary of Test Method
(whichcanbeclosedbyapinchclamporstopcockwhileliquid
3.1 Kinematic viscosity is measured at low temperature in
is being drawn into the efflux bulb) so that the restriction to air
accordancewithTestMethodD445andattimeintervalsof3h
flow will not cause error. Replace the silica gel when a
and 72 h.
lavender color is noticeable.
NOTE 1—This test method was developed and the precision established 5.4 Viscosity Temperature Bath—The constant-temperature
on tests at −53.9°C (−65°F). It is also applied at −40°C (−40°F) and may
bath must be capable of holding several viscometers at once. It
must have adequate stirring of the liquid medium (Note 2) and
balance between heat losses such that the bath temperature can
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This test method is under the jurisdiction of ASTM Committee D02 on
bemaintainedattherequiredtemperature 60.03°C(60.05°F).
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties.
NOTE 2—Isopropanolorotherclear,low-freezingliquidmaybeusedas
Current edition approved Dec. 1, 2003. Published January 2004. Originally
a bath liquid.
approved in 1966. Last previous edition approved in 1998 as D2532–93 (1998).
DOI: 10.1520/D2532-03.
5.5 Low-Temperature Storage Cabinet—If it is desired to
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
exercise the option described in Note 3 (7.4), a low-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on temperature storage cabinet or bath shall be provided which is
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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