ASTM D2532-93(1998)
(Test Method)Standard Test Method for Viscosity and Viscosity Change After Standing at Low Temperature of Aircraft Turbine Lubricants
Standard Test Method for Viscosity and Viscosity Change After Standing at Low Temperature of Aircraft Turbine Lubricants
SCOPE
1.1 This test method covers the determination of the kinematic viscosity of aircraft turbine lubricants at low temperature, and the percent change of viscosity after a 3-h and a 72-h standing period at low temperature.
1.2 This test method uses the millimetre squared per second (mm /s) as the unit of kinematic viscosity. For information, the equivalent cgs unit, the centistokes, is shown in parentheses.
1.3 This standard does not purport to address all of the safety problems, 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 specific hazard statements, see Section 6.
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An American National Standard
Designation: D 2532 – 93 (Reapproved 1998)
Standard Test Method for
Viscosity and Viscosity Change After Standing at Low
Temperature of Aircraft Turbine Lubricants
This standard is issued under the fixed designation D 2532; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This test method has been adopted for use by government agencies to replace Method 307 of Federal Test Method Standard No. 791b.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the kine- 4.1 Aircraft turbine lubricants, upon standing at low tem-
matic viscosity of aircraft turbine lubricants at low tempera- peratures for prolonged periods of time, may show an increase
ture, and the percent change of viscosity after a 3-h and a 72-h in kinematic viscosity. This increase may cause lubrication
standing period at low temperature. problems in aircraft engines. Thus, this test method is used to
1.2 This test method uses the millimetre squared per second ensure that the kinematic viscosity does not exceed the
(mm /s) as the unit of kinematic viscosity. For information, the maximum kinematic viscosity in certain specifications for
equivalent cgs unit, the centistokes, is shown in parentheses. aircraft turbine lubricants.
1.3 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-
priate safety and health practices and determine the applica- mometer, timer, secondary viscosity standard, filter, and clean-
ing supplies are described in detail in Test Method D 445.
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 6. 5.2 Viscometer—The viscometer shall meet the require-
ments of Test Method D 445 and be of the type in which the
2. Referenced Documents
sample can be rerun without cleaning the viscometer. Suitable
2.1 ASTM Standards: holders should be used. For convenience it is recommended
D 445 Test Method for Kinematic Viscosity of Transparent that the viscometer size be chosen to keep the efflux time
and Opaque Liquids (the Calculation of Dynamic Viscos- between 200 and 1000 s.
ity) 5.3 Drying Tubes—Fit the viscometer openings with drying
E 1 Specification for ASTM Thermometers tubes filled with indicating silica gel, using cotton at top and
bottom to hold the loosely packed desiccant in place. Provide
3. Summary of Test Method
a cross-connection on the viscometer side of the drying tubes
3.1 Kinematic viscosity is measured at low temperature in (which can be closed by a pinch clamp or stopcock while liquid
accordance with Test Method D 445 and at time intervals of 3
is being drawn into the efflux bulb) so that the restriction to air
h and 72 h. flow will not cause error. Replace the silica gel when a
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
be used at other temperatures. Viscosities may be measured and reported
at other intervals as agreed by the contracting parties. must have adequate stirring of the liquid medium (Note 2) and
balance between heat losses such that the bath temperature can
be maintained at the required temperature 6 0.03°C
This test method is under the jurisdiction of ASTM Committee D-2 on
(60.05°F).
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
D 02.07on Flow Properties.
NOTE 2—Isopropanol or other clear, low-freezing liquid may be used as
Current edition approved Sept. 15, 1993. Published November 1993. Originally
a bath liquid.
published as D 2532 – 66. Last previous edition D 2352 – 87e .
Annual Book of ASTM Standards, Vol 05.01.
Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 2532
5.5 Low-Temperature Storage Cabinet—If it is desired to 7.2.3 Make the first determination of kinematic viscosity 35
exercise the option described in Note 4 (7.4), a low- min 6 1 min after the viscometer is placed in the bath.
temperature storage cabinet or bath shall be provided which is Measure the efflux time as specified in Test Method D 445. Be
capable of holding the required temperature with a variation careful that the stopcock or pinch clamp joining each arm of
not to exceed 60.3°C (60.5°F). the viscometer has been opened to ensure that there is no effect
5.6 Bath Thermometer—Calibrated ASTM Kinematic Vis- of the drying tubes on the efflux time.
cosity Test Thermometer such as 73F or 74F conforming to the 7.3 Measure the kinematic viscosity after standing3hatthe
requirements as prescribed in Specification E 1. Other cali- required temperature. Without removal of the viscometer from
brated thermometric devices are permissible provided their the constant-temperature bath, repeat the viscosity determina-
accuracy, precision, and sensitivity are equal to or better than tion (7.2.3) at 3 h 6 5 min after the completion of the initial
the above thermometers. viscosity determination.
5.7 Secondary Viscosity Standards. 7.4 Measure the kinematic viscosity after standing 72 h at
the required temperature. Without removal of the viscometer
6. Proced
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