Designation:G99−17StandardTestMethodforWearTestingwithaPin-on-DiskApparatus1ThisstandardisissuedunderthefixeddesignationG99;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversalaboratoryprocedurefordeterminingthewearofmaterialsduringslidingusingapin-on-diskapparatus.Materialsaretestedinpairsundernominallynon-abrasiveconditions.Theprincipalareasofexperimentalattentioninusingthistypeofapparatustomeasureweararedescribed.Thecoefficientoffrictionmayalsobedetermined.1.2Thistestmethodstandardusesaspecificsetoftestparameters(load,slidingspeed,materials,etc.)thatwerethenusedinaninterlaboratorystudy(ILS),theresultsofwhicharegivenhere(Tables1and2).(ThissatisfiestheASTMforminthat“Thedirectionsforperformingthetestshouldincludealloftheessentialdetailsastoapparatus,testspecimen,procedure,andcalculationsneededtoachievesatisfactoryprecisionandbias.”)Anyusershouldreportthatthey“fol-lowedtherequirementsofASTMG99,”wherethatistrue.1.3Nowitisoftenfoundinpracticethatusersmayfollowallinstructionsgivenhere,butchooseothertestparameters,suchasload,speed,materials,environment,etc.,andtherebyobtaindifferenttestresults.Suchauseofthisstandardisencouragedasameanstoimproveweartestingmethodology.However,itmustbeclearlystatedinanyreportthat,whilethedirectionsandprotocolinTestMethodG99werefollowed(iftrue),thechoicesoftestparametersweredifferentfromTestMethodG99values,andthetestresultswerethereforealsodifferentfromtheTestMethodG99results.Thisuseshouldbedescribedashaving“followedtheprocedureofASTMG99.”Alltestparametersthatwereusedinsuchcasemustbestated.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibility...
