ASTM D7670-10
(Practice)Standard Practice for Processing In-service Fluid Samples for Particulate Contamination Analysis Using Membrane Filters
Standard Practice for Processing In-service Fluid Samples for Particulate Contamination Analysis Using Membrane Filters
SIGNIFICANCE AND USE
This practice provides for the processing of liquid samples. It will provide the optimum sample processing for visual contamination methods such as Test Methods F312.
SCOPE
1.1 This practice covers the processing of in-service fluids in preparation for particulate contamination analysis using membrane filters and is limited only by the liquid-to-membrane filter compatibility.
1.2 The practice covers the procedure for filtering a measured volume of liquid through a membrane filter. When this practice is used, the particulate matter will be randomly distributed on the filter surface for subsequent contamination analysis methods.
1.3 The practice describes procedures to allow handling particles in the size range between 2 and 1000 μm with minimum losses during handling.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7670 − 10
Standard Practice for
Processing In-service Fluid Samples for Particulate
Contamination Analysis Using Membrane Filters
This standard is issued under the fixed designation D7670; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope F312 Test Methods for Microscopical Sizing and Counting
Particles from Aerospace Fluids on Membrane Filters
1.1 This practice covers the processing of in-service fluids
in preparation for particulate contamination analysis using
3. Terminology
membranefiltersandislimitedonlybytheliquid-to-membrane
3.1 Definitions:
filter compatibility.
3.1.1 filtered liquid dispenser, n—as used in this practice, a
1.2 The practice covers the procedure for filtering a mea-
dispensercapableofdeliveringrinseliquidthroughafilterwith
sured volume of liquid through a membrane filter. When this
pore size no larger than half the size of the smallest particle
practice is used, the particulate matter will be randomly
being considered for measurement.
distributed on the filter surface for subsequent contamination
3.1.2 filter patch test, n—preparation of a sample by mem-
analysis methods.
branefiltration,asdescribedinthispractice,isoftenreferredto
1.3 The practice describes procedures to allow handling
as a patch test, or a filter patch test.
particles in the size range between 2 and 1000 µm with
minimum losses during handling.
4. Significance and Use
1.4 The values stated in SI units are to be regarded as
4.1 This practice provides for the processing of liquid
standard. No other units of measurement are included in this
samples. It will provide the optimum sample processing for
standard.
visual contamination methods such as Test Methods F312.
2. Referenced Documents
5. Apparatus and Materials
2.1 ASTM Standards:
5.1 Filtration Funnel.
D287 Test Method for API Gravity of Crude Petroleum and
5.2 Membrane Filter Support—Either a fritted-glass,
Petroleum Products (Hydrometer Method)
sintered-metal, polyphenyl-sulfone, or stainless steel screen
D1078 Test Method for Distillation Range of Volatile Or-
may be used. The support shall be so designed as to enable
ganic Liquids
attachment to a vacuum flask.
D1193 Specification for Reagent Water
D1353 Test Method for Nonvolatile Matter in Volatile Sol- 5.3 Vacuum Flask.
vents for Use in Paint, Varnish, Lacquer, and Related
5.4 Funnel-Holding Device—A provision should be made
Products
for the dissipation of static electricity from the funnel.
D1836 Specification for Commercial Hexanes
5.5 Clean Bench or Hood—Supplied with unidirectional
D2021 Specification for Neutral Detergent, 40 PercentAlky-
3 flow filtered air in which uncovered components may be
lbenzene Sulfonate Type (Withdrawn 2000)
placed.
5.6 VacuumSource—Minimumvacuumgaugereadingof61
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
kPa (or other metric units acceptable to ASTM).
Products and Lubricants and is the direct responsibility of Subcommittee D02.96.06
on Practices and Techniques for Prediction and Determination of Microscopic Wear 5.7 Forceps—Unserrated tips.
and Wear-related Properties.
5.8 Filtered Liquid Dispenser.
Current edition approved Oct. 1, 2010. Published November 2010. DOI:
10.1520/D7670-10.
5.9 MembraneFilter—Poresizenogreaterthanhalfthesize
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of the smallest particle being considered for measurement.
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
5.10 Petri Dishes—Glass. Plastic petri dishes may be used
the ASTM website.
only if the selected plastic is known to be compatible with the
The last approved version of this historical standard is referenced on
www.astm.org. filtered liquid.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7670 − 10
NOTE 2—Distilled or deionized water shall be used in areas where
6. Reagents and Materials
hardness or contamination increase the blank count over the allowable
6.1 Purity of Reagents—Reagent grade chemicals shall be
level.
used in all tests. Unless otherwise indicated, it is intended that
7.2 SampleBottlePreparation—Repeattheprocedureof7.1
all reagents shall conform to the specifications of the Commit-
for both the sample bottles and caps, then allow them to drip
tee onAnalytical Reagents of theAmerican Chemical Society,
4 dry. Place a piece of plastic film that has been rinsed with
where such specificati
...
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