1、Designation: D 6795 08An American National StandardStandard Test Method forMeasuring the Effect on Filterability of Engine Oils AfterTreatment with Water and Dry Ice and a Short (30-min)Heating Time1This standard is issued under the fixed designation D 6795; the number immediately following the desi
2、gnation 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.INTRODUCTIONAny properly equipped laborato
3、ry, without outside assistance, can use the procedure described inthis test method. However, the ASTM Test Monitoring Center (TMC)2provides reference oils and anassessment of the test results obtained on those oils by the laboratory (seeAnnexA1). By these means,the laboratory will know whether their
4、 use of the test method gives results statistically similar to thoseobtained by other laboratories. Furthermore, various agencies require that a laboratory utilize the TMCservices in seeking qualification of oils against specifications. For example, the U.S. Army imposessuch a requirement in connect
5、ion with several Army engine lubricating oil specifications.Accordingly, this test method is written for use by laboratories that utilize the TMC services.Laboratories that choose not to use those services may simply ignore those portions of the test methodthat refer to the TMC.This test method may
6、be modified by means of information letters issued by the TMC. In addition,the TMC may issue supplementary memoranda related to the test method (see Annex A1).For other information, refer to the research report of this test method.31. Scope1.1 This test method covers the determination of the ten-den
7、cy of an oil to form a precipitate that can plug an oil filter.It simulates a problem that may be encountered in a new enginerun for a short period of time, followed by a long period ofstorage with some water in the oil.1.2 The values stated in SI units are to be regarded asstandard. No other units
8、of measurement are included in thisstandard.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-bility of regulat
9、ory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:4D 1193 Specification for Reagent WaterD 4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD 4485 Specification for Performance of Engine OilsD 5844 Test Method for Evaluation of Automotive EngineOils for Inhibi
10、tion of Rusting (Sequence IID)5D 5862 Test Method for Evaluation of Engine Oils inTwo-Stroke Cycle Turbo-Supercharged 6V92TA DieselEngineE 344 Terminology Relating to Thermometry and Hydrom-etry3. Terminology3.1 Definitions:3.1.1 calibrate, vto determine the indication or output ofa measuring device
11、 with respect to that of a standard. E 3441This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.B0 on Automotive Lubricants.Current edition approved Dec. 1, 2008. Published January 2009. Originallyapp
12、roved in 2002. Last previous edition approved in 2007 as D 679502(2007).2ASTM Test Monitoring Center, 6555 Penn Ave., Pittsburgh, PA 152006-4489.This test method is supplemented by Information Letters and Memoranda issued bythe ASTM Test Monitoring Center. Users of this test method can contact the A
13、STMTest Monitoring Center to obtain the most recent of these.3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: D021529.4For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servi
14、ceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.5Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
15、hohocken, PA 19428-2959, United States.3.1.2 calibration test, na test, using a coded reference oil,conducted as specified in the test method.3.1.2.1 DiscussionThe test result is used to determine thesuitability of the testing facility/laboratory to conduct suchtests on non-reference oils.3.1.3 cand
16、idate oil, nan oil that is intended to have theperformance characteristics necessary to satisfy a specificationand is tested against that specification. D 58443.1.4 engine oil, na liquid that reduces friction or wear, orboth, between the moving parts within an engine; removesheat, particularly from
17、the underside of pistons; and serves asa combustion gas sealant for the piston rings.3.1.4.1 DiscussionIt may contain additives to enhancecertain properties. Inhibition of engine rusting, deposit forma-tion, valve train wear, oil oxidation, and foaming are examples.D 58623.1.5 non-reference oil, nan
18、y oil other than a referenceoilsuch as a research formulation, commercial oil, or candi-date oil. D 58443.1.6 reference oil, nan oil of known performance char-acteristics, used as a basis for comparison.3.1.6.1 DiscussionReference oils are used to calibratetesting facilities, to compare the performa
19、nce of other oils, orto evaluate other materials (such as seals) that interact withoils. D 58443.2 Definitions of Terms Specific to This Standard:3.2.1 effective filter area, nthat surface of a test filter thatcan receive the material to be filtered.3.2.2 new oil, nan unused oil having the identical
20、 formu-lation and base stock as the test oil.3.2.3 test oil, nthe new oil with water added and dry iceadded.3.2.3.1 DiscussionA potential precipitate in the test oil isinduced by heating the oil and aging.4. Summary of Test Method4.1 The test oil is treated with deionized water and dry ice.The sampl
21、e is heated to 70C for 30 min, followed by storageat room temperature. The sample is filtered and the flow rate iscalculated determining the engine oil filterability characteris-tics.5. Significance and Use5.1 It is normal for some of the combustion products of aninternal combustion engine to penetr
22、ate into the engine lubri-cant and be retained in it.5.2 When an engine is run for a period of time and thenstored over a long period of time, the by-products of combus-tion may be retained in the oil in a liquefied state.5.3 Under these circumstances, precipitates can form thatimpair the filterabil
23、ity of the oil the next time the engine is run.5.4 This test method subjects the test oil and the new oil tothe same treatments such that the loss of filterability can bedetermined.5.5 Reference oils, on which the data obtained by this testmethod is known, are available.5.6 This test method requires
24、 that a reference oil also betested and results reported. Two oils are available, one knownto give a low and one known to give a high data value for thistest method.NOTE 1When the new oil test results are to be offered as candidate oiltest results for a specification, such as Specification D 4485, t
25、he specifi-cation will state maximum allowable loss of filterability (flow reduction)of the test oil as compared to the new oil.6. Apparatus6.1 The apparatus consists of a 25-mL burette, a filter holderwith 25-m automotive oil filter paper, and a source of 69 6 2kPa air pressure. Discs of filter pap
26、er are cut to fit the holderand installed (see Fig. 1).6.1.1 Burette (glass or plastic), 25 mL, with polytetrafluo-roethylene (PTFE) stopcock and 1.8 6 0.1 mm burette tipopening.6.1.2 Air Regulator, capable of regulating air to a pressureof 69 6 2 kPa.6.1.3 Filter Holder, with effective filter area
27、approximately0.8 cm2.6.1.4 Automotive Oil Filter Paper, 25 mm, (25-m poros-ity).66.2 Blender, capable of 18 000 rpm 610 % without thecontainer.6.2.1 Timer, capable of timing 30 6 1s.6.3 Container, 250 mL, with blade compatible with theblender.6.4 Syringe, 1000 L.6.5 Dry Ice (solid carbon dioxide).6.
28、6 Mechanical Convection Oven, capable of maintaining70 6 1C.6.7 Sensors (or equivalent timing devices), capable of mea-suring sequential events to 1 s resolution.6.8 Glass Jars, 60 mL, with inert lined lids.7. Reagents7.1 Purity of ReagentsUse reagent grade chemicals in alltests. Unless otherwise in
29、dicated, it is intended that all reagentsshall conform to the specifications of the Committee onAnalytical Reagents of theAmerican Chemical Society,7wheresuch specifications are available. Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to per
30、mit its use without lessening the accuracy ofthe determination.7.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean Specification D 1193Type III deionized water or water of equivalent purity.6The sole source of supply of the automotive oil filter paper known
31、to thecommittee at this time is The Central Parts Distributor, OH Technologies Inc., P.O.Box 5039, Mentor, OH 44061-5039. If you are aware of alternative suppliers, pleaseprovide this information to ASTM International Headquarters. Your comments willreceive careful consideration at a meeting of the
32、responsible technical committee,1which you may attend.7Reagent Chemicals, American Chemical Society Specifications , AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd.
33、, Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc., (USPC), Rockville,MD.D67950827.3 TMC Reference OilsThese are available from the TestMonitoring Center.8. Sampling8.1 Take samples in accordance with the instructions inPractice D 405
34、7.9. Preparation of Test Oil Sample and Filter9.1 Mix 49.7 6 0.1 g of test oil, 0.3 6 0.05 g (0.3 6 0.05mL with the 1000-L syringe) of deionized water and approxi-mately 10 g of dry ice in the blender for 30 6 1 s at 18 000 rpm610 %. Cover the top of the container loosely to prevent oilspattering wh
35、ile allowing rapid vaporization of the dry ice.9.2 Transfer the sample to a 60-mL wide-mouth glass bottleand place the loosely capped (14 turn) bottle in an oven at 70.06 1.0C for 30 6 2 min. Remove from the oven, tighten capand allow to cool to room temperature (20 to 24C).9.3 Store in dark at room
36、 temperature (20 to 24C).9.4 Determine filterability 48 6 2 h after removing thesample from the oven.9.5 Dry filters in an oven at 70 6 2C for 30 6 2 min andstore in a desiccator until used.10. Procedure10.1 Assemble apparatus as shown in Fig. 1 with filterinstalled in proper orientation (25-m smoot
37、h side up).10.2 Determine the new oil flow rate by placing a sample ofthe new oil in the burette. Pressurize the system and force atleast 10 mL of oil through the filter to saturate the filter with oiland remove any air bubbles. Disconnect the air line and fill theburette with new oil to a level 1 t
38、o 2 cm above the 0 mark.Pressurize the system to 69 6 2 kPa, open the stopcock, andmeasure the flow time for each successive 5 mL of oil betweenthe 0 and 25-mL graduations.10.3 To determine the test oil flow rate, the flow times of thenew oil are first determined in accordance with 10.2. Using thesa
39、me filter disc, filter holder, and burette, reduce the new oillevel in the burette to the lowest level that allows no air bubblesbelow the stopcock. Disconnect the air line and fill the burettewith a well-mixed sample of test oil to a level 1 to 2 cm abovethe 0 mark. Pressurize the system to 69 6 2
40、kPa, open thestopcock, and measure the flow time for each successive 5 mLof oil between the 0 and 25-mL graduations.10.4 Run each non-reference and reference oil in duplicate;repeat Section 9 and 10.1 to 10.4 for each non-reference andeach reference oil.10.5 For TMC-monitored tests, run the TMC refe
41、rence oilon the same day as the non-reference oil.10.6 For tests not monitored by the TMC, an in-housequality assurance oil can be used in place of the TMCreference.NOTEFilter holder has approximate area of 0.8 cm2. It contains automotive oil filter paper (25 m porosity).FIG. 1 Apparatus to Measure
42、Engine Oil FilterabilityD679508311. Calculation11.1 Calculate the flow rate for the new oil and the test oilfor each 5-mL portion of oil using Eq 1:flow rate 5AB(1)where:A = volume of oil, andB = flow time.11.2 Calculate the percent change in flow rate of the test oilrelative to the new oil with the
43、 final oil flow rates (between 20and 25 mL measured with the same filter disc) using Eq 2:percent change in flow rate 5E 2 DD3 100 (2)where:D = final new oil flow rate, andE = final test oil flow rate.12. TMC Reference Oil Testing12.1 Test a TMC-coded reference oil along with each batchof non-refere
44、nce oil tests. Run the reference oil simultaneouslywith, and in the same batch as, the non-reference oils.NOTE 2AnnexA1 discusses the involvement of theASTM TMC withrespect to the reference test-monitoring program.12.1.1 Prior to conducting a reference oil test, procure asupply of reference oils dir
45、ectly from the TMC. These oils havebeen formulated or selected to represent specific chemistrytypes, or performance levels, or both. Each reference oilsample is identified using a unique set of identification codeson the container labels. The coded reference samples providefor a blind reference-test
46、ing program to protect against thepossibility of bias in the results.12.1.1.1 The testing laboratory tacitly agrees to use theTMC reference oils exclusively in accordance with the TMCspublished Policies for Use and Analysis of ASTM ReferenceOils, and to run and report the reference oil test accordin
47、g toTMC guidelines.NOTE 3Policies for the Use and Analysis of ASTM Reference Oilsare available from the TMC.12.1.2 Request a reference oil assignment from the TMC forthis test method. The TMC will determine the specific refer-ence oil to be tested by the laboratory. Assignments will bemade by the un
48、ique identifying codes on the reference oilcontainer labels.12.1.3 Run the TMC reference oil test according to the testmethod and in the same manner as the non-reference oil test(s).Run the reference oil simultaneously with, and in the samebatch as, the non-reference oils. Reference oils and non-ref
49、erence oils in the same batch shall be run within the same4-h time frame.12.1.4 Reporting of Reference Oil Test ResultsReport theresults of all reference oil tests to the TMC according to thefollowing directives:12.1.4.1 The data report forms are available from the TMCfor reporting all TMC reference oil test data to the TMC.Report only the reference oil results to the TMC. Do notinclude any non-reference test data. Complete all of therequired blank fields on the forms.12.1.4.2 Transmit reference test data to the TMC by elec-tronic means or by tele
