1、Designation: D8022 15Standard Test Method forRoll Stability of Lubricating Grease in Presence of Water(Wet Roll Stability Test)1This standard is issued under the fixed designation D8022; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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 procedure for determining theroll stability of lubricating grease in the pre
3、sence of water (wetroll stability) by using a roll stability test apparatus.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its
4、 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:2D217 Test Methods for Cone Penetration of LubricatingGreaseD1193 Specifi
5、cation for Reagent WaterD1403 Test Methods for Cone Penetration of LubricatingGrease Using One-Quarter and One-Half Scale ConeEquipmentD1831 Test Method for Roll Stability of Lubricating GreaseD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleu
6、m, PetroleumProducts, and Lubricants3. Terminology3.1 Definitions:3.1.1 consistency, nof lubricating grease, degree of resis-tance to movement under stress.3.1.1.1 DiscussionThe term consistency is used somewhatsynonymously with penetration. Generally, consistency refersto the worked penetration of
7、a grease. D41753.1.2 lubricating grease, nsemi-fluid to solid product of adispersion of a thickener in a liquid lubricant.3.1.2.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immobilizes the liquid lubricant bysurface tension and other physical forces. Other ingredients arec
8、ommonly included to impart special properties. D2173.1.3 wet roll stability, nof lubricating grease, change inconsistency of a mixture of sample and small amount of waterafter a specified amount of rolling in a roll stability testapparatus.4. Summary of Test Method4.1 A grease sample mixed with a sm
9、all amount of water issubjected to low shear at 20 C to 35 C for a specified time ina roll stability apparatus. The difference between the conepenetration before working and the cone penetration after isused as a measure of the wet roll stability of the grease.5. Significance and Use5.1 It is known
10、that contamination by water can affect thestructural stability of some greases in service. The test proce-dure specified in this method is widely used to determine thewet structural stability of greases in service. Many greasespecifications require this procedure as a wet structural stabilitytest. N
11、o accurate correlation is established between the testresults and wet structural stability of grease in actual service.6. Apparatus6.1 Roll Stability Test Apparatus, as specified in TestMethod D1831.6.2 Penetrometer and/or One-quarter or One-half ScaleCone and Shaft, as specified in Test Methods D14
12、03.6.3 One-quarter or One-half Scale Cup and Worker, asdescribed in Test Methods D1403.6.4 Spatula, with a blade longer than 150 mm.7. Reagents and Materials7.1 Appropriate Volatile Gum-Free Solvent, for example,mineral spirits.1This test method is under the jurisdiction of ASTM Committee D02 onPetr
13、oleum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.G0.07 on Research Techniques.Current edition approved Dec. 15, 2015. Published February 2016. DOI:10.1520/D8022-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cus
14、tomer 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 States17.2 Cloth or Paper Wiper, for wipin
15、g grease from thepenetrometer cone. The wiper should be soft, so as not toscratch the surface of the cone.7.3 Distilled Water, Specification D1193, Type II minimumpurity.8. Procedure8.1 Determine the worked penetration of the grease to betested in accordance with Test Methods D1403.8.2 Transfer 63.0
16、 g 6 0.2 g of unworked grease to testcylinder. Distribute the grease uniformly on the inside wall ofthe cylinder with a spatula.8.3 Place the weighed roller in the cylinder.8.4 Add 7.0 g 6 0.2 g distilled water to the cylinder, andtighten the cap.NOTE 1The relative amount of grease and water added c
17、an beadjusted to the desired ratio but the total amount of material should bemaintained at 70 g. An example being 56 g of grease, 14 g water wouldequal 20 % water.8.5 Mount the cylinder in position, start the machine, andrecord the time and room temperature which should be limitedto 20 C to 35 C. If
18、 the cylinder is enclosed within a cabinet,the temperature around cylinder shall be maintained at20 C to 35 C.8.6 After rolling the cylinder for 2 h 6 5 min, remove thegrease from the cylinder promptly and proceed with therequirements of worked penetration in Test Methods D1403.Record the worked pen
19、etration. After transferring the grease tothe worker, clean the test apparatus by wiping with clean clothor tissue.8.7 Convert the fractional scale penetration values deter-mined by Test Methods D1403 (before and after test) into theequivalent full scale cone penetration values using the appro-priat
20、e equations described in Test Methods D1403.9. Calculation or Interpretation of Results9.1 Calculate the change in consistency of the sample asfollows:Penetration change 5 P2 2 P1 (1)where:P2 = final full-scale equivalent penetration reading, andP1 = initial full-scale equivalent penetration reading
21、.NOTE 2Penetration reading is measured in tenths of a millimetre. Anegative penetration change indicates hardening of grease while a positivepenetration change indicates softening.10. Report10.1 The value calculated in 9.1 is reported with the testprocedure as the wet shear stability of the grease.
22、A notation iffree water is present is useful information.11. Precision and Bias311.1 PrecisionThe precision of this test method as deter-mined by a statistical examination of interlaboratory test resultsshown in Table 1. Their round robin samples are listed in Table2.11.1.1 RepeatabilityThe differen
23、ce between successiveresults obtained by the same operator with the same apparatusunder constant operating conditions on identical test materialswould, in the long run, in normal and correct operation of thetest method exceed the following values only in 1 case in 20:Repeatability = 22 penetration u
24、nits11.1.2 ReproducibilityThe difference between two singleand independent results obtained by different operators work-ing in different laboratories on identical test material would, inthe long run, in the normal and correct operation of the testmethod, exceed the following values only in 1 case in
25、 20:Reproducibility = 36 penetration units11.2 BiasThis test method has no bias because the valueof the relative wet roll stability of grease can be defined onlyin terms of the test method.12. Keywords12.1 cone penetration; consistency; lubricating grease; pen-etration; roll stability; water stabili
26、ty test; wet roll stability3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1825. ContactASTM CustomerService at serviceastm.org.TABLE 1 Round Robin Test ResultsLabSampleS1 S2 S3 S4 S51 3 +32 +64 +40 +24+2 +16 +68 +39 +232 +4
27、 +38 +54 +52 +18+3 +48 +60 +37 +263 +26 12 +52 +22 +3+ 12 0 +50 +38 24 18 +26 +38 +37 +221 +29 +39 +42 +275 +8 +64 +58 +40 +24+4 +26 +60 +36 +206 6 +44 +55 +36 +202 +37 +58 +34 +247 12 +60 +30 +32 +124 +60 +52 +26 +108 +2 +42 +58 +40 +200 +50 +62 +44 +229 +30 +79 +41 +26 +19+ 19 +90 +33 +22 +2210 +2
28、 +50 . +20 +10+10 +52 . +48 +12D8022 152ASTM 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 determination of the validity of any such patent rights, and the
29、 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 withdrawn. Your comments are invited either for revision of
30、 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 your comments have not received a fair hearing you shouldm
31、ake 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
32、 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 2 Round Robin SamplesSampleCodeASTMCodeNLGIGradeThickenerTypeSupplierS1 G030101 2 Al-complex SummitS2 G030102 3 Lithium ShellS3 G030103 2 Polyurea ExxonMobilS4 G030104 1 Lithium CitgoS5 G030105 1 Li-complex ShellD8022 153
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