ASTM_D_942_-_19.pdf

Designation:D94219Designation:142/85(92)Standard Test Method forOxidation Stability of Lubricating Greases by the OxygenPressure Vessel Method1This standard is issued under the fixed designation D942;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method determines resistance of lubricatinggreases to oxidation when stored statically in an oxygenatmosphere in a sealed system at an elevated temperature underconditions of test.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionPressure measurement appears in kPawith psi provided for information only.1.2.2 ExceptionIn Fig.A1.1,A1.1,and Appendix X1,alldimensions are in millimeters,with inches provided in paren-theses for 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 practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements see Sections 6 and 7.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on 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:2A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate,Sheet,and Strip for PressureVessels and for General ApplicationsD525 Test Method for Oxidation Stability of Gasoline(In-duction Period Method)E1 Specification for ASTM Liquid-in-Glass ThermometersE2877 Guide for Digital Contact Thermometers2.2 Other Standards:IP Specification for Standard IP Thermometers3BS 970:1983 Part I,Section S43.Summary of Test Method3.1 The sample of grease is oxidized in a pressure vesselheated to 99 C(210 F)and filled with oxygen at 758 kPa(110 psi).Pressure is observed and recorded at stated intervals.The degree of oxidation after a given period of time isdetermined by the corresponding decrease in oxygen pressure.NOTE1The pressure vessel has been referred to as“a bomb”inprevious issues of this test method.NOTE2The accepted unit of pressure is the pascal(Pa)for ASTMmethods and will be parenthetically included after the conventionalpound-force per square inch(psi)value.The Energy Institute uses the baras a pressure measurement.Conversion of units may be obtained asfollows:To convert from pound-force per square inch(psi)to pascal(Pa)multiply by 6.894757 103.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.09.0E on Oxidation of Greases.In the IP,this test method is under the jurisdiction of the StandardizationCommittee.This test method has been approved by the sponsoring committee andaccepted by the cooperating societies in accordance with the established procedures.Current edition approved Nov.1,2019.Published December 2019.Originallyapproved in 1947.Last previous edition approved in 2015 as D942 15.DOI:10.1520/D0942-19.2For 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.3Available from Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.uk.4Available from British Standards Institute(BSI),389 Chiswick High Rd.,London W4 4AL,U.K.,http:/www.bsi-.*A Summary of Changes section appears at the end of 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.1 To convert from pound-force per square inch(psi)to bar multiply by0.06894757.To convert from bar to pascal(Pa)multiply by 105.4.Significance and Use4.1 This test method measures the net change in pressureresulting from consumption of oxygen by oxidation and gain inpressure due to formation of volatile oxidation by-products.This test method may be used for quality control to indicatebatch-to-batch uniformity.It predicts neither the stability ofgreases under