ASTM D2619-95(2002)e1
(Test Method)Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)
Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)
SIGNIFICANCE AND USE
This method differentiates the relative stability of hydraulic fluids in the presence of water under the conditions of the test. Hydrolytically unstable hydraulic fluids form acidic and insoluble contaminants which can cause hydraulic system malfunctions due to corrosion, valve sticking, or change in viscosity of the fluid. The degree of correlation between this test and service performance has not been fully determined.
SCOPE
1.1 This test method covers the determination of the hydrolytic stability of petroleum or synthetic-base hydraulic fluids.
Note 1—Water-base or water-emulsion fluids can be evaluated by this test method but are run "as is." Additional water is not added to the 100-g sample.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are provided for information only.
1.3 This standard does not purport to address all of the safety concerns, 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. Specific hazard statements are given in 3.1, 6.1, 6.3, 6.4, and Annex A1.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
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Designation:D2619–95 (Reapproved 2002)
Standard Test Method for
Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle
Method)
This standard is issued under the fixed designation D2619; 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.
´ NOTE—Warning notes were placed in the text editorially in May 2002.
1. Scope acid number changes of fluid and acidity of water layer are
2 determined. (Warning—In addition to other precautions, be-
1.1 This test method covers the determination of the
cause this test method involves the use of a glass bottle that
hydrolytic stability of petroleum or synthetic-base hydraulic
may contain approximately 200 kPa (2 atm) of air and water
fluids.
vapor at temperatures up to 93°C, a full face shield and heavy
NOTE 1—Water-base or water-emulsion fluids can be evaluated by this
wovenfabricglovesshouldbewornwhenhandlingorworking
test method but are run “as is.”Additional water is not added to the 100-g
with the heated and sealed sample container.)
sample.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
standard. The inch-pound units given in parentheses are
4.1 This method differentiates the relative stability of hy-
provided for information only.
draulic fluids in the presence of water under the conditions of
1.3 This standard does not purport to address all of the
the test. Hydrolytically unstable hydraulic fluids form acidic
safety concerns, if any, associated with its use. It is the
and insoluble contaminants which can cause hydraulic system
responsibility of the user of this standard to establish appro-
malfunctions due to corrosion, valve sticking, or change in
priate safety and health practices and determine the applica-
viscosity of the fluid. The degree of correlation between this
bility of regulatory limitations prior to use. Specific hazard
test and service performance has not been fully determined.
statements are given in 3.1, 6.1, 6.3, 6.4, and Annex A1.
5. Apparatus
2. Referenced Documents
5.1 Air Oven, convection, adjusted to 93 6 0.5°C (200 6
2.1 ASTM Standards:
1°F).
D445 Test Method for Kinematic Viscosity of Transparent
5.2 Pressure-Type Beverage Bottles, 200 mL (7-oz).
and Opaque Liquids (and Calculation of Dynamic Viscos-
5.3 Capping Press, for bottles.
ity)
5.4 Rotating Mechanism, for holding bottles and rotating
D974 Test Method for Acid and Base Number by Color-
end over end at 5 rpm in oven.
Indicator Titration
5.5 Centrifuge, 1500 rpm.
5.6 Centrifuge Tubes, cone-shaped, 100-mL.
3. Summary of Test Method
5.7 Filtration Assembly, stainless screen/glass, membrane
3.1 The sample of 75 g of fluid plus 25 g of water and a
type 47-mm diameter.
copper test specimen are sealed in a pressure-type beverage
5.8 Typewriter Brush.
bottle. The bottle is rotated, end for end, for 48 h in an oven at
5.9 Separatory Funnel, 125-mL.
93°C (200°F). Layers are separated, and insolubles are
5.10 Microscope, for 203 magnification.
weighed. Weight change of copper is measured. Viscosity and
5.11 Balance, sensitive to 0.2 mg.
5.12 Caps, for sealing bottles.
1 5.13 Inert Seal, for cap gasket.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.N0.08 on Thermal Stability.
Current edition approved Jan. 15, 1995. Published March 1995. Originally An acceptable commercial unit is available from Falex Corp. 1020Airpark Dr.,
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published as D2619 – 67. Last previous edition D2619 – 88 (1994) . DOI: Sugar Grove, IL 60554.
10.1520/D2619-95R02E01. A 200-mL (7-oz) glass Coca Cola trademarked bottle has proven satisfactory.
This test method is a modification of Federal Test Method Standard No. 791a, Bottles can be obtained from beverage distributors.
Method 3457 for Hydrolytic Stability. A Millipore XX10 047 30 or equivalent has proven satisfactory.
3 7
Annual Book of ASTM Standards, Vol 05.01. A 0.127-mm (0.005-in.) thick fluorocarbon seal has proven satisfactory.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2619–95 (2002)
the separatory funnel, remove the water wash, and return the fluid to the
5.14 Membrane Type Filter, cellulosic, 5-µm porosity,
separatory funnel for repeated water washes.
47-mm diameter.
NOTE 3—Mechanical stirring for 1 h with the anhydrous sodium sulfate
dries the fluid efficiently. This is done prior to vacuum dehydration.
6. Reagents and Materials
7.9 Determine the viscosity of the filtered fluid in accor-
6.1 n-Heptane.(Warning—Flammable, harmful if inhaled,
dance with Test Method D445. Compare the result with
skin irritant on repeated contact, aspiration hazard; see A1.1.)
viscosity of the original fluid sample and calculate the percent-
6.2 Phenolphthalein, 1 % alcoholic solution.
age viscosity change at 40°C (104°F).
6.3 Potassium Hydroxide (KOH), 0.1 N aqueous solution
7.10 Determine the total acid number of the filtered fluid in
standardized to within 0.0005 N.(Warning—Caustic.)
accordance with Test Method D974. Acidity for the filtered
6.4 1,1,1-Trichloroethane.(Warning—Harmful if inhaled,
fluid is compared to that of the original fluid and the acid
high concentrations may cause unconsciousness or death;
number change recorded.
contact may cause skin irritations and dermatitis, may produce
7.11 Filter the water phase and the emulsion layer (which
toxic vapors if burned, eye irritant; see A1.2.)
usually contains the bulk of the insoluble material) through the
6.5 CopperStrip (QQ-C-576A), 16-22 B and S gage, 13 by
membrane filter. Rinse the copper test specimen, pipet, centri-
51 mm.
fuge tube, beaker, and beverage bottle with distilled water and
6.6 Steel Wool, grade 1-medium fine.
n-heptane. Filter these washes through the membrane. Segre-
6.7 Litmus Paper.
gate the water wash. Then wash with 50 mLof n-heptane. Dry
themembraneina60°C(140°F)ovenandweigh.Calculatethe
7. Procedure
percentage of insolubles in the 75-g sample.
7.1 Fill the pressure beverage bottle with distilled water and
7.12 Combine all the water portion and washes. Determine
allow to stand overnight. Drain and rinse, with distilled water,
total acidity by adding 1.0 mLof phenolphthalein solution and
but do not dry.
titrating rapidly with 0.1 N KOH solution to the appearance of
7.2 Weigh 75 g of
...
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