ASTM_B_970_-_09.pdf

Designation:B97009Standard Test Method forCleanliness of Powder Metallurgy(PM)Bearings andStructural Parts1This standard is issued under the fixed designation B970;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a quantitative procedure todetermine the cleanliness of PM bearings and structural parts.1.2 This is a laboratory test consisting of cleaning sampleparts under controlled conditions and calculating the amount orpercent of residue from the mass of the removed contaminants.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B243 Terminology of Powder Metallurgy3.Terminology3.1 Definitions of PM terms can be found in TerminologyB243.Additional descriptive material is available in theRelated Materials section of Volume 02.05 of theAnnual Bookof ASTM Standards.4.Summary of Test Method4.1 The parts are washed with a solvent to remove surfaceresidue.4.2 The rinse solution is collected and filtered to capture theresidue removed from the parts.4.3 The filter is dried and the mass of residue measured.5.Significance and Use5.1 Residue on a bearing may be detrimental to its longevitydue to abrasive wear.5.2 Residue on structural parts may affect the fit of assem-blies or disturb the performance of the entire piece of equip-ment via excess friction or wear.5.3 Part producers can utilize this procedure to determinethe cleanliness of their processes.High residue levels onsintered parts may indicate a lubricant removal problem.Residue levels may also indicate the condition of various fluidsused in part processing.5.4 This test method can be applied when required by theuser or internally for process engineering or quality control/compliance purposes by the producer.6.Apparatus6.1 BasketPerforated aluminum,wire or stainless steelbasket with handle to submerge parts in the solvent when usingcleaning Method A.6.2 ContainerGlass or metal container sized to hold testfluid and parts.6.3 SolventLaboratory grade toluene,petroleum ether orothers as specified,since these are extremely flammablematerials,extra care should be used to avoid ignition sources.6.4 Filter apparatus and filtersUnless otherwise speci-fied,a 10 m nylon filter shall be used.6.5 Analytical BalanceWith a sensitivity of 0.0001 g.6.6 BalanceCapable of weighing the parts tested to foursignificant figures if reporting a mass%.6.7 Container Weighing bottle or petri dishes.6.8 Squirt Bottle50 mL suggested.6.9 Drying OvenCapable of 120 C,should be explosionproof if solvent is highly flammable.6.10 Vacuum PumpCapable of sustaining a pressure lowerthan 70 kPa.6.11 Ultrasonic BathIf used to replace manual agitation(see section 8.2).1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and are the direct responsibility of Subcom-mittee B09.04 on Bearings.Current edition approved Nov.1,2009.Published March 2010.DOI:10.1520/B0970-09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Interferences7.1 The larger the sample size the greater the precision thatwould be expected.7.2 2 The type of solvent can produce different resultsdepending on the aggressiveness of the solution.7.3 The cleanliness requirements of the application willdictate the aperture size of the filter.7.4 The size of the parts being tested will have a direct effecton the number that need to be tested.7.5 The samples shall be protected from external contami-nation until ready to test.8.Procedure8.1 Cleaning and Rinsing the Parts Method A:8.1.1 The parties involved shall agree to the sample size andsampling method.In no case shall the sample size be less than100 g.8.1.2 Select the filter diameter to match the filter apparatusbeing used for this test.8.1.3 Weigh the petri dish/bottle to the nearest 0.0001 g andrecord its mass so it can be tared from the mass of containerplus filter.This container will be used to store the dried filterfrom paragraph 8.1.4 and 8.3.4.8.1.4 Dry the filter paper in the laboratory oven at approxi-mately 120 C for at least 15 min.Place the dried filter in acovered petri dis