1、Designation:D94215Designation: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 ca
2、se 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
3、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 thisstanda
4、rd.1.2.1 ExceptionPressure measurement appears in psi withkPa provided in parentheses for information only.1.2.2 ExceptionIn Fig.A1.1,all dimensions are in inches,with millimetres provided in parentheses for information only.1.3 This standard does not purport to address all of thesafety concerns,if
5、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.For specific hazardstatements see Sections 6 and 7.2.Referenced Documents2.1 ASTM Standards:2
6、A240/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 Thermometers2.2 Other Standards:IP S
7、pecification 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 110 psi(758 kPa).Pressure is observed and recorded at stated inter-vals.The degree of oxidation after
8、 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 conve
9、ntionalpound-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.To convert from pound-force per square inch(psi)to bar multiply
10、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 qualit
11、y control to indicatebatch-to-batch uniformity.It predicts neither the stability ofgreases under dynamic service conditions,nor the stability ofgreases stored in containers for long periods,nor the stabilityof films of greases on bearings and motor-parts.It should notbe used to estimate the relative
12、 oxidation resistance of differentgrease types.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
13、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 April 1,2015.Published June 2015.Originallyapproved in 1947.Last previous edition approved in 20
14、07 as D942 02(2007).DOI:10.1520/D0942-15.2For 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 In
15、stitute,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
16、 Box C700,West Conshohocken,PA 19428-2959.United States1 5.Apparatus5.1 Oxidation Pressure Vessel,Sample Dish,Dish Holder,Pressure Gage and Oil Bath as described in detail in theAnnex.NOTE3Other constant-temperature baths may be used if they areequivalent in heat capacity and thermal gradient characteristics to the oilbath described in the Annex and can be shown to maintain the pressurevessel at the prescribed test temperature.5.2 Thermometer,having a range as shown below andconforming to the re
