ASTM D2715-92(1997)

Standard Test Method for Volatilization Rates of Lubricants in Vacuum

SCOPE
1.1 This test method covers the determination of the rates of volatilization of lubricants in a thermal-vacuum environment at pressures and temperatures necessary to obtain a measurable rate of evaporation, or evidence of decomposition.  
1.2 The values stated in SI units are to be regarded as the standard.
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.>

General Information

• Status: Historical
• Publication Date: 31-Dec-1996
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.L0.07 - Engineering Sciences of High Performance Fluids and Solids (Formally D02.1100)

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact
ASTM International (www.astm.org) for the latest information.
Designation: D 2715 – 92 (Reapproved 1997) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Volatilization Rates of Lubricants in Vacuum
This standard is issued under the fixed designation D 2715; 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.
1. Scope 5.1.1 When Procedure B for the more volatile samples is
−2 −4
used, the vacuum requirement shall be 10 Pa (10 torr) or
1.1 This test method covers the determination of the rates of
less.
volatilization of lubricants in a thermal-vacuum environment at
5.2 Vacuum System—A pumping system capable of main-
pressures and temperatures necessary to obtain a measurable
−6 −5 −8 −7
taining a starting pressure of 10 to 10 Pa (10 to 10 torr)
rate of evaporation, or evidence of decomposition.
(5.1.1). An optically dense baffle system should be used to
1.2 The values stated in SI units are to be regarded as the
ensure freedom from back-streaming. A conventional bell jar
standard.
system with an oil diffusion pump, a mechanical back-up
1.3 This standard does not purport to address all of the
pump, and an optically dense, liquid, nitrogen-cooled baffle has
safety concerns, if any, associated with its use. It is the
been found satisfactory on the configuration as shown in Fig. 1.
responsibility of the user of this standard to establish appro-
5.3 Furnace, with thermocouple indicator, capable of main-
priate safety and health practices and determine the applica-
taining a constant sample temperature 63°C. All parts of this
bility of regulatory limitations prior to use.
furnace must be proved to be usable at the highest temperature
2. Referenced Documents and vacuum contemplated.
5.4 Recorder, capable of recording weight changes continu-
2.1 ASTM Standards:
ously with the balance used, to the performance specified in
E 296 Practice for Ionization Gage Application to Space
2
5.1.
Simulators
5.5 Specimen Container, made of 300 series stainless steel
E 297 Method for Calibrating Ionization Vacuum Gage
3
in the form of a straight cylinder with an aspect ratio of height
Tubes
to diameter of approximately 1:14. Where chemical reactions
3. Summary of Test Method are experienced with the container, alternative materials may
be used.
3.1 A known quantity of specimen is placed in a thermal
5.6 Contacting Thermocouple, touching solid or immersed
vacuum balance system and the evaporated material is con-
in liquid specimens, with the leads brought out in such a way
densed on a cold plate. The weight of the specimen is
as not to influence balance indication.
continually recorded as a function of time for nominal constant
5.7 Cold Plate—A condensing shield cooled with liquid
surface area.
nitrogen to immobilize molecules evaporated from the lubri-
4. Significance and Use cant which subtends, at least, a 160° arc from the center of the
sample.
4.1 This test method provides data for comparison of the
5.8 Nude Ionization Gage, installed as described in ASTM
evaporation rate of lubricants used in unshielded bearings in
Practice E 296 and calibrated as described in Method E 297.
the space environment.
5.9 Optional Supplemental Equipment:
5.9.1 Mass Spectrometer, to identify degassing products and
5. Apparatus
evaporating species.
5.1 Recording Vacuum Microbalance, with capacity of 1 g
5.9.2 Infrared Optical Pyrometer System, for determining
or more, sensitivity of 0.01 mg or less, zero stability of 0.025
the specimen temperature. This must be calibrated against the
mg or less for 8 h with ranges of weight change of 10 mg or
−5 thermocouple for each material used, due to emissivity effects.
more, and 0.1 mg or less, capable of being pumped to 10 Pa
−7
5.9.3 Copper Tab, on a cold plate facing the specimen, for
(10 torr) or less.
X-ray analysis of the condensate.
5.9.4 Noncontact Specimen Thermocouple, calibrated
1
against 5.5.
This test method is under the jurisdiction of ASTM Committee D-2 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
5.9.5 Pressure Recording Pen, added to the recorder.
D02.11 on Engineering Sciences of High Performance Fluids and Solids.
5.9.6 Time Derivative Computer, to report the rate directly.
Current edition approved Oct. 15, 1992. Published December 1992. Originally
published as D 2715 – 68. Last previous edition D 2715 – 86.
6. Reagents and Materials
2
Annual Book of ASTM Standards, Vol 15.03.
3
Discontinued; see 1985 Annual Book of ASTM Standards, Vol 15.03. 6.1 A
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