Designation:D3890−18StandardPracticeforNumberofStrokestoPrimeaMechanicalPumpDispenser1ThisstandardisissuedunderthefixeddesignationD3890;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthedeterminationofthenumberofactuationsrequiredtoprimeapumpdispenser(sprayandflowtypes)withaconsumer-typeproduct.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SignificanceandUse2.1Thispracticecanbeusedtovisuallycompareprimingcharacteristicsofdifferentpumpdispensersanddifferentprod-ucts.2.2Thispracticeissuitableforestablishingspecificationsforboththepumpdispenserandthefinalpackage.3.Apparatus3.1Noapparatusisrequired,althoughamechanicaldeviceforactuatingthepumpdispensermaybeused.4.Sampling4.1Selectanappropriatenumberofdry,unusedpumpdispensersatrandomfortheprecisionandaccuracydesired.Anumberoftentestspecimensarerecommended,butamini-mumofthreeisacceptable.5.Conditioning5.1Ifpossible,conditionthetestspecimensat2363°C(7365.4°F)fornotlessthan4h.Ifthetestspecimensarenotconditionedattherecommendedtemperature,thisshouldbenotedinthetestreportdiscussedin8.1.5.2Testpumpsshouldbetestednosoonerthan24hafterassemblywhenpossible.Ifthepumpsarenotconditionedattherecommendedtime,thisshouldbenotedinthetestreportdiscussedin8.1.6.TestSpecimens6.1Foreachtestspecimen,selectacontainert...
