Designation:D7752−18StandardPracticeforEvaluatingCompatibilityofMixturesofHydraulicFluids1ThisstandardisissuedunderthefixeddesignationD7752;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThispracticecoversthecompatibilityofmixturesofhydraulicfluidsasdefinedbySpecificationsD6158,DIN51524,ISO11158,andISO15380.1.2Thispracticecanbeusedtoevaluatenew(unused)lubricantcompatibilityortheeffectsofcombiningnew(re-placement)lubricantwithin-service(original)lubricantinthesystem.1.3Toevaluateprimarycompatibilityusingthismethod,thereplacementfluidmustpasstheISO13357-1StageIIfilter-abilitytest.TheoriginalfluidisnotrequiredtopassISO13357-1filterabilitytest,StageIorII.1.4Primarytestingisconductedonfluidmixturesin2:98,10:90,and50:50ratiosusingtheISO13357-1FilterabilityTest,StageII.1.5Secondarytestingissuggestedwhencircumstancesindicatetheneedforadditionaltesting.1.6Thispracticedoesnotevaluatethewearpreventioncharacteristics,loadcarryingcapacity,orthemechanicalshearstabilityoflubricantmixtureswhileinservice.Ifanti-wear(AW),extremepressure(EP),orshearstabilityaretobeevaluated,furthertestingoftheseparametersmayberequired.1.7Thispracticedoesnotpurporttocoveralltestmethodsthatcouldbeemployed.1.8ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.9Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.10Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWo...
