1、Designation:D261921Standard Test Method forHydrolytic Stability of Hydraulic Fluids(Beverage BottleMethod)1This standard is issued under the fixed designation D2619;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method2covers the determination of thehydrolytic stability of petroleum or synthetic-based hydraulicfluids.NOTE1Water-ba
3、sed or water-emulsion fluids can be evaluated by thistest method,but they are run“as is.”Additional water is not added to the100 g sample.In these cases,the person requesting the test needs to let thetest operator know that water is present.1.2 The values stated in SI units are to be regarded as the
4、standard.The English units given in parentheses are providedfor information only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental pract
5、ices and deter-mine the applicability of regulatory limitations prior to use.Specific warning statements are given in 3.1,6.1,6.3,6.9 andAnnex A1.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on
6、 Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD6
7、64 Test Method for Acid Number of Petroleum Productsby Potentiometric TitrationD974 Test Method for Acid and Base Number by Color-Indicator Titration3.Summary of Test Method3.1 A copper test specimen and 75 g of test fluid plus 25 gof water(or 100 g of a water-containing fluid)are sealed in apressur
8、e-type beverage bottle.The bottle is rotated,end forend,for 48 h in an oven at 93 C(200 F).Layers are separatedand the weight change of the copper specimen is measured.The acid number change of the fluid and acidity of the waterlayer are determined.(WarningIn addition to otherprecautions,because thi
9、s test method involves the use of aglass bottle that may contain approximately 200 kPa(2 atm)ofair and water vapor at temperatures up to 93 C,a full faceshield and heavy woven fabric gloves should be worn whenhandling or working with the heated and sealed samplecontainer.)4.Significance and Use4.1 T
10、his test method differentiates the relative stability ofhydraulic fluids in the presence of water under the conditionsof the test.Hydrolytically unstable hydraulic fluids form acidicand insoluble contaminants which can cause hydraulic systemmalfunctions due to corrosion,valve sticking,or change invi
11、scosity of the fluid.The degree of correlation between thistest method and service performance has not been fullydetermined.5.Apparatus5.1 Air Oven,convection,adjusted to 93 C 6 0.5 C(200 F 6 1 F).5.2 Pressure-Type Beverage Bottles,4200 mL(7 oz),asshown in Fig.1.It is not essential that bottles conf
12、orm exactlyto the dimensions shown as long as they fit securely in theholders and caps do not leak.Bottles with straight sides and anarrower neck are also marketed for this application but thereare some reports of breakage during use as the copper couponwill move with greater velocity during the rot
13、ation.The curvedsides help to slow the movement of the coupon.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.N0 on Hydraulic Fluids.Current edition approved May 1,2021.Published Jun
14、e 2021.Originallyapproved in 1967.Last previous edition approved in 2014 as D2619 09(2014).DOI:10.1520/D2619-21.2This test method is a modification of Federal Test Method Standard No.791a,Method 3457 for Hydrolytic Stability.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontac
15、t ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Bottles can be obtained from suppliers of the test apparatus or from beveragedistributors.*A Summary of Changes section appears at the end o
16、f this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.3 Capping Press,for bottles.5.4 Rotating Mechanism,for holdi
