1、Designation: D 2595 96 (Reapproved 2008)An American National StandardStandard Test Method forEvaporation Loss of Lubricating Greases Over Wide-Temperature Range1This standard is issued under the fixed designation D 2595; the number immediately following the designation indicates the year oforiginal
2、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 Department of Defense
3、.1. Scope1.1 This test method covers the determination of evapora-tion loss of lubricating greases at temperatures between 93 and316C (200 and 600F). This test method is intended toaugment Test Method D 972, which is limited to 149C(300F).1.2 The values stated in SI units are to be regarded as thest
4、andard. The values in parentheses are 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 and health practices and determine the applica-bi
5、lity of regulatory limitations prior to use. For specific safetyinformation, see 5.2.2. Referenced Documents2.1 ASTM Standards:2A 240/A 240M Specification for Chromium andChromium-Nickel Stainless Steel Plate, Sheet, and Stripfor Pressure Vessels and for General ApplicationsD 217 Test Methods for Co
6、ne Penetration of LubricatingGreaseD 972 Test Method for Evaporation Loss of LubricatingGreases and OilsE1 Specification for ASTM Liquid-in-Glass Thermometers3. Terminology3.1 Definitions:3.1.1 lubricating grease, na semi-fluid to solid product ofa thickener in a liquid lubricant.3.1.1.1 DiscussionT
7、he dispersion of the thickener forms atwo-phase system and immobilizes the liquid lubricant bysurface tension and other physical forces. Other ingredients arecommonly included to impart special properties. D 2173.1.2 thickener, na substance composed of finely-dividedparticles dispersed in a liquid t
8、o form the products structure.3.1.2.1 DiscussionThickeners can be fibers (such as vari-ous metallic soaps) or plates or spheres (such as certainnon-soap thickeners), which are insoluble or, at most, only veryslightly soluble in the liquid lubricant. The general require-ments are that the solid parti
9、cles are extremely small, uni-formly dispersed, and capable of forming a relatively stable,gel-like structure with the liquid lubricant. D 2174. Summary of Test Method4.1 A weighed sample of grease in an evaporation cell isplaced in a heating device maintained at the desired testtemperature. Heated
10、air is passed over the grease surface for 226 0.1 h. The loss in weight of the sample due to evaporationis determined.5. Significance and Use5.1 The loss of volatile materials from greases and oils canadversely affect the original performance characteristics of alubricant and, therefore, could be a
11、significant factor inevaluating a lubricant for a specific use. Such volatiles can alsobe considered contaminants in the environment in which the1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.G
12、0.03 on Physical Tests.Current edition approved May 1, 2008. Published September 2008. Originallyapproved in 1967. Last previous edition approved in 2002 as D 259596(2002)1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For A
13、nnual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.lubricant is to be used. Correlation between results from thistest method
14、 and service performance has not been established.5.2 The test method can be used at any specified tempera-ture between 93 and 316C (200 and 600F) that may beagreed upon by the user of the method. (WarningThis testmethod should not be used at temperatures which exceed theflash point of the base oil
15、of the grease.)NOTE 1The specified flow of air, 2.58 6 0.02 g/min, (2 L/min atstandard temperature and pressure), assumes dry air. It is not known thatthe original work involved dry air but it has since been shown that this canbe a factor in reproducibility and should be addressed. Air with a dewpoi
16、nt of less than 10C at standard temperature and pressure will besatisfactory.6. Apparatus36.1 Evaporation Cell Assembly (Fig. 1) consisting of thefollowing items:6.1.1 Sample Cup, A.6.1.2 Hood, B.6.1.3 Cover and Eduction Tube, CThese items (5.1.1 to5.1.3) shall be constructed from a stainless steel
17、conforming toType 304 of Specification A 240. Design dimensions anddimensional tolerances shall be as shown in Fig. 2 and Fig. 3.6.1.4 GasketShall be of a heat-resistant (315C (600F)material. A gasket cut from 3.2 mm (18-in.) TFE-fluorocarbonsheet has been found to work successfully.6.1.5 Thermocoup
18、le Tube and SupportsThe tube shall beof stainless steel having an outside diameter of 3.18 6 0.025mm (0.125 6 0.001 in.) and fitted with stainless steel centeringdevices as shown in Fig. 1.6.2 Air Supply SystemShall consist of a calibrated flow-meter, filtering device, and accessory valves capable o
19、f deliv-ering and maintaining a flow of dust-free air at the rate of 2.586 0.02 g/min between 15.6 and 29.4C (60 and 85F) (2 L/minat standard temperature and pressure).6.3 Heating Device3An aluminum block heater similar tothat shown in Fig. 4 has been found to be satisfactory. It ismore fully descri
20、bed in Appendix X1.6.4 ThermometersASTM thermometers graduated in ei-ther Fahrenheit or Celsius degrees and having a range from 53The sole source of supply of the apparatus known to the committee at this timeis Koehler Instrument Co., 1595 SycamoreAve., Bohemia, NY11716 (in the UnitedStates) and Sta
21、nhope Seta, Ltd., Park Close, Englefield Green, Egham, SurreyTW20 OXD, England. If you are aware of alternative suppliers, please provide thisinformation to ASTM International Headquarters. Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou
22、may attend.FIG. 1 Thermocouple Arrangement SECTION OF GREASE SAMPLE CUP ALL DIMENSIONS 60.0156 in. (60.4mm) UNLESS OTHERWISE SPECIFIEDFIG. 2 Evaporation Test CellFIG. 3 Assembled Test Cell in Aluminum Block HeaterD 2595 96 (2008)2to 400C (20 to 760F) and conforming to the requirements forThermometer
23、s 3C or 3F respectively as described in Specifi-cation E1.7. Sampling7.1 Each test will require approximately 20 g to fill thesample cup for a single run. Therefore, the sample presentedfor analysis should be large enough to make possible theselection of a representative portion for testing. Examine
24、 thesample for any indication of non-homogeneity such as oilseparation, phase changes, or gross contamination. If anyabnormal conditions are found, obtain a new sample.8. Preparation of Apparatus8.1 Clean thoroughly all parts of the evaporation cellassembly.8.2 With Fig. 1 as reference, connect the
25、cover-eductiontube (C) to the hood (B). Adjust thermocouple tube so that thebottom of the tube is flush with face of hood as shown. Insertthermocouple in tube and adjust so that tip is flush with bottomedge of tube. Fasten the thermocouple securely in this positionby compressing the top edge of the
26、tube. Remove the tube-thermocouple assembly and disconnect the hood from thecover-eduction tube.8.3 Clean thoroughly all parts of the evaporation cellassembly.8.4 Place the cover-eduction tube (C) thermocouple assem-bly and gasket in the heating device as shown by Fig. 4. Fastenthe cover securely in
27、 position.8.5 Adjust the temperature of the heating device to maintainthe test temperature and control within 61.0C (62F). Usethe thermometer for this observation.8.6 Regulate air flow through the assembly to 2.58 6 0.02g/min (2 litres/min at standard temperature and pressure).8.7 By regulating the
28、air preheater, adjust the exit airtemperature to the specified test temperature within 61.1C(62F). Use the thermocouple plus a temperature indicator orrecorder for this measurement.8.8 Maintain the temperatures of the heating device and exitair and the air flow rate for at least 0.5 h prior to test.
29、9. Procedure9.1 Weigh the clean grease sample cup and hood to thenearest 0.01 g. Remove the hood and fill the cup with the testgrease taking care to avoid occlusion of air. Smooth the surfacelevel with the rim of the cup with a straight edge spatula.Remove with a clean cloth any grease which may rem
30、ain onthe rim or threads of the cup. Thread the hood tightly onto thecup without disturbing the smoothed grease surface. Weigh theassembly and record the net mass of the grease sample to thenearest 0.01 g.9.2 Remove the cover, eduction tube, and thermocoupleassembly from the heating device. Thread t
31、he weighed andassembled sample cup and hood into the eduction tube. Installthe complete assembly in the heating device. Fasten the coversecurely in position. If necessary, readjust the temperature andair flow to the levels required.9.3 Maintain the air flow rate at 2.58 6 0.02 g/min (2L/min) and the
32、 exit air temperature at the required testtemperature within 61.1C (62F) for 22 6 0.1 h. The exit airtemperature shall be the specified test temperature.9.4 At the end of the 22-h period, remove the assembledsample cup and hood from the cell and allow to cool to roomtemperature. Determine the net ma
33、ss of the sample to thenearest 1 mg.10. Calculation10.1 Calculate the evaporation loss of the sample as fol-lows:Mass % evaporation loss 5 S 2 W!/S 3 100 (1)where:S = initial mass of sample, g, andW = mass of sample after test, g.11. Precision and Bias11.1 The precision of this test method is not kn
34、own to havebeen obtained in accordance with currently accepted guidelines(see the Committee D02 Research Report RR:D02-1007,“Manual on Determining Precision Data for ASTM Methodson Petroleum Products and Lubricants”).11.1.1 RepeatabilityThe difference between two test re-sults obtained by the same o
35、perator with the same apparatusunder constant operating conditions on identical test materialwould, in the long run, in the normal and correct operation ofthe test, exceed the following value only in one case in twenty:10 % of the mean value11.1.2 ReproducibilityThe difference between two singleand
36、independent results obtained by different operators work-ing in different laboratories on identical materials would, in thelong run, exceed the following value only in one case intwenty:15 % of the mean value11.2 BiasBias cannot be determined in this test methodbecause the value of the evaporation l
37、oss can be defined onlyin terms of the test method.12. Keywords12.1 evaporation; grease; high temperature; test cell; vola-tilesFIG. 4 Aluminum Block HeaterD 2595 96 (2008)3APPENDIX(Nonmandatory Information)X1. ALUMINUM BLOCK HEATERX1.1 The aluminum block heater found to be satisfactoryconsists of a
38、n aluminum block approximately 254 mm (10 in.)wide, 356 mm (14 in.) long, and 203 mm (8 in.) deep. It iscompletely and adequately insulated on all sides. It is heated bytwo 650-W cartridge-type heaters and a 500-W ring-typeheater under each of the two cells as shown in Fig. 2. Thesewere sufficient f
39、or the two-cell block but if additional evapo-ration spaces are included, additional or larger heaters will berequired. The heaters should be of sufficient size so that theblock will return to the desired test temperature within 60 minafter insertion of the test samples. It shall be equipped withsuf
40、ficient heaters and control instruments to maintain thedesired test temperature within 1.1C (62F).ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determ
41、ination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or w
42、ithdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that
43、your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2595 96 (2008)4
