ASTM F862-11(2022)

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: F862 − 11 (Reapproved 2022)
Standard Practice for
pH and Chloride-ion Concentration of Aerospace Hydraulic
Fluids
ThisstandardisissuedunderthefixeddesignationF862;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 3.1.1 The pH is measured using a glass electrode and pH
meter.
1.1 This practice covers the measurement of the pH and
3.1.2 The quantity of the chloride ion is determined using a
chloride ion of water extraction of aerospace hydraulic fluids.
chloride selective ion electrode and a selective ion meter.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 On application of the hydraulic fluid within the me-
1.3 This standard does not purport to address all of the
chanical fluidic system, the fluid may become contaminated
safety concerns, if any, associated with its use. It is the
with acid and chloride ion. Mechanical shearing of the hydrau-
responsibility of the user of this standard to establish appro-
lic fluid in the presence of the minute quantity of water and
priate safety, health, and environmental practices and deter-
residual amount of organic solvents, used in cleaning, may
mine the applicability of regulatory limitations prior to use.
initiate formation of acid and chloride ion. Measurements are
1.4 This international standard was developed in accor-
desired to control and maintain the cleanliness and non-
dance with internationally recognized principles on standard-
corrosiveness of the fluidic system.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Apparatus
mendations issued by the World Trade Organization Technical
5.1 Combination pH Selective Ion Meter,
Barriers to Trade (TBT) Committee.
5.2 Glass Electrode—The pH response shall be 60.05 pH.
2. Referenced Documents
5.3 Reference Electrode—A calomel, silver/silver chloride,
or other reference electrode of constant potential.
2.1 ASTM Standards:
D512 Test Methods for Chloride Ion In Water (Withdrawn
5.4 Chloride Selective Ion Electrode.
2021)
5.5 Double Junction Reference Electrode, sleeve-type
D1193 Specification for Reagent Water
E70 Test Method for pH of Aqueous Solutions With the
5.6 Separatory Funnel, 250 mL.
Glass Electrode
6. Reagents
3. Summary of Method
6.1 Water, reagent grade, Type IV, in accordance with
3.1 The aerospace hydraulic fluid sample is shaken with Specification D1193.
water, and the pH and the quantity of chloride ion are
6.2 Reference Buffer Solutions, SRM/RM 185, 186,
determined from the water layer.
and 187—Materials supplied by the National Institute of Stan-
dards and Technology with pH values.
This practice is under the jurisdiction of ASTM Committee F07 on Aerospace
7. Standardization of pH Meter
and Aircraft and is the direct responsibility of Subcommittee F07.07 on Qualifica-
tion Testing of Aircraft Cleaning Materials.
7.1 Standardize the pH meter in accordance with Test
Current edition approved May 1, 2022. Published June 2022. Originally
Method E70.
approved in 1984. Last previous edition approved in 2017 as F862 – 11(2017). DOI:
10.1520/F0862-11R22.
PART A—pH MEASUREMENT
For referenced ASTM stand
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