ASTM F311-08(2020)
(Practice)Standard Practice for Processing Aerospace Liquid Samples for Particulate Contamination Analysis Using Membrane Filters
Standard Practice for Processing Aerospace Liquid Samples for Particulate Contamination Analysis Using Membrane Filters
SIGNIFICANCE AND USE
4.1 This practice provides for the processing of liquid samples obtained in accordance with Practice F302 and Practices F303. It will provide the optimum sample processing for visual contamination methods such as Method F312, and Test Method F314.
SCOPE
1.1 This practice covers the processing of liquids 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.
1.5 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.
General Information
Relations
Standards Content (Sample)
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: F311 − 08 (Reapproved 2020)
Standard Practice for
Processing Aerospace Liquid Samples for Particulate
Contamination Analysis Using Membrane Filters
ThisstandardisissuedunderthefixeddesignationF311;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope vents for Use in Paint, Varnish, Lacquer, and Related
Products
1.1 This practice covers the processing of liquids in prepa-
D1836 Specification for Commercial Hexanes
ration for particulate contamination analysis using membrane
D2021 Specification for Neutral Detergent, 40 PercentAlky-
filters and is limited only by the liquid-to-membrane filter
lbenzene Sulfonate Type (Withdrawn 2000)
compatibility.
F302 Practice for Field Sampling of Aerospace Fluids in
1.2 The practice covers the procedure for filtering a mea-
Containers
sured volume of liquid through a membrane filter. When this
F303 Practices for Sampling for Particles in Aerospace
practice is used, the particulate matter will be randomly
Fluids and Components
distributed on the filter surface for subsequent contamination
F312 Test Methods for Microscopical Sizing and Counting
analysis methods.
Particles from Aerospace Fluids on Membrane Filters
1.3 The practice describes procedures to allow handling
3. Definition
particles in the size range between 2 and 1000 µm with
minimum losses during handling.
3.1 filtered liquid dispenser—as used in this practice, a
dispensercapableofdeliveringrinseliquidthroughafilterwith
1.4 The values stated in SI units are to be regarded as
pore size no larger than half the size of the smallest particle
standard. No other units of measurement are included in this
being considered for measurement.
standard.
1.5 This international standard was developed in accor-
4. Significance and Use
dance with internationally recognized principles on standard-
4.1 This practice provides for the processing of liquid
ization established in the Decision on Principles for the
samples obtained in accordance with Practice F302 and Prac-
Development of International Standards, Guides and Recom-
tices F303. It will provide the optimum sample processing for
mendations issued by the World Trade Organization Technical
visual contamination methods such as Method F312, and Test
Barriers to Trade (TBT) Committee.
Method F314.
2. Referenced Documents
5. Apparatus and Materials
2.1 ASTM Standards:
5.1 Filtration Funnel—The funnel opening in contact with
D287 Test Method for API Gravity of Crude Petroleum and
the membrane shall be approximately 35.0 mm in inside
Petroleum Products (Hydrometer Method)
diameter. The effective area shall be calibrated. If the funnel is
D1078 Test Method for Distillation Range of Volatile Or-
to be used for measuring the sample volume, the funnel shall
ganic Liquids
be calibrated within 62 % of the required volume.
D1193 Specification for Reagent Water
5.2 Membrane Filter Support—Either a fritted-glass,
D1353 Test Method for Nonvolatile Matter in Volatile Sol-
sintered-metal, polyphenyl-sulfone or stainless steel screen
may be used. The support shall be so designed as to enable
attachment to a vacuum flask.
This practice is under the jurisdiction of ASTM Committee E21 on Space
Simulation andApplications of Space Technology and is the direct responsibility of
5.3 Vacuum Flask.
Subcommittee E21.05 on Contamination.
Current edition approved April 1, 2020. Published April 2020. Originally
5.4 Funnel-Holding Device—A provision should be made
approvedin1969.Lastpreviouseditionapprovedin2013asF311 – 08(2013).DOI:
for the dissipation of static electricity from the funnel.
10.1520/F0311-08R20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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 The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F311 − 08 (2020)
5.5 A clean bench or hood, supplied with unidirectional 6.5.2 API Gravity, 70 deg min, as determined in accordance
flow filtered air, in which uncovered components may be with Test Method D287.
placed. 6.5.3 Residue, 0.004 g/100 mL max, as determined in
accordance with Method D1353.
5.6 Vacuum Source—Minimum vacuum gage reading of
61 kPa (or other metric units acceptable to ASTM).
NOTE 2—Commercial hexanes conforming to Specification D1836
meet this requirement. Other chlorinated solvents, conforming to the
5.7 Forceps, unserrated tips.
Montreal conference on control of chlorinated fluorocarbons may be
substitutedwheresolventpresentsasafetyhazard,providingthesubstitute
5.8 Filtered Liquid Dispenser.
solvent is compatible with the membrane filter and adequate ventilation is
5.9 Membrane Filter, pore size no greater than half the size
used to avoid inhalation of the vapors.
of the smallest particle being considered for measurement.The
6.6 Rinse Liquid—This liquid shall be specified by the user
filter shall have an imprinted grid on 3.10 6 0.02-mm centers.
and shall be compatible with the sample liquid the plastic film
The color shall be chosen to provide maximum contrast with
(see section 5.12) and the membrane filter.
the particulate contamination to be observed.
7. Preparation of Apparatus
NOTE 1—When testing military hydraulic fluids, a white cellulose
membrane of 0.45-µm pore size, capable of filtering 80 mL of distilled
7.1 Wash the apparatus thoroughly in a solution of liquid
water per square centimeter per minute at 93 kPa (or other metric units
detergent and hot water and rinse with hot tap water (Note 3).
acceptable to ASTM) and 25 °C is required.
Rinse with filtered isopropyl alcohol to remove the water; then
5.10 Petri Dishes, glass. Plastic Petri dishes may be used
rinse twice with filtered solvent.
only if the selected plastic is known to be compatible with the
NOTE 3—Distilled or deionized water shall be used in areas where
filtered liquid.
hardness or contamination increase the blank count over the allowable
5.11 Glass Bottles, small-mouth, screw-capped, perma-
level.
nently marked to indicate sample volume.
7.2 Sample Bottle Preparation—Repeattheprocedureof7.1
5.12 Plastic Film, 0.002-in. (0.05-mm) minimum thickness.
for both the sample bottles and caps, then allow them to drip
dry. Place a piece of plastic fi
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.