1、Designation:D207091(Reapproved 2010)Standard Test Method forThermal Stability of Hydraulic Oils1This standard is issued under the fixed designation D2070;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 method2is designed primarily to evaluate thethermal stability of hydrocarbon based hydraulic oils althoughoxidation may occur during
3、 the test.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 use.It is theresponsibility of the user of this standard to establis
4、h appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D4057 Practice for Manual Sampling of Petroleum andPetroleum Products2.2 Copper Development Association Standard4UNS C11000 Electrolytic Tough
5、Pitch Copper2.3 American Iron and Steel Institute Standard(AISI)5W-1 Carbon Tool Steel3.Summary of Test Method3.1 A beaker containing test oil,copper and iron rods isplaced in an aluminum block in an electric gravity convectionoven for 168 h at a test temperature of 135C.At thecompletion of the test
6、,the copper and steel rods are ratedvisually for discoloration and the oil is analyzed for thequantity of sludge.4.Significance and Use4.1 Thermal stability characterizes physical and chemicalproperty changes which may adversely affect an oils lubricat-ing performance.This test method evaluates the
7、thermalstability of a hydraulic oil in the presence of copper and steelat 135C.Rod colors are the evaluation criteria.Sludge valuesare reported for informational purposes.No correlation of thetest to field service has been made.5.Apparatus5.1 An aluminum block with equally spaced holes is used.An ex
8、ample is described in Fig.A1.1 of Annex A1.5.2 Electric gravity convection oven capable of maintainingthe aluminum block at a test temperature of 135C 6 1C.5.2.1 Calibrated thermocouple and temperature indicatorcentered in aluminum block.5.3 250 mL Griffin beakers of borosilicate glass.5.4 Copper te
9、st specimens are to be UNS C11000,99.9%pure electrolytic tough pitch copper,6.35 mm in diameter by7.6 cm in length(0.25 in.by 3.0 in.).5.5 Steel test specimens are to be AISI W-1 1%carbonsteel,6.35 mm in diameter 7.6 cm in length(0.25 by 3.0 in.).5.6 Silicon carbide abrasive 320 grit with cloth back
10、ing.5.7 Crocus cloth.5.8 No.41 Whatman filter paper,6,747 mm diameter.5.9 Millipore filter,7,88 micron Type SC,47 mm diameter.5.10 Millipore glass filter holder,47 mm,Cat#XX10.04700or equivalent.5.11 Cincinnati Milacron color chart.7,95.12 25 mL pipette.1This test method is under the jurisdiction of
11、 ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.N0.08 on Thermal Stability.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1991.Last previous edition approved in 2006 as D207091(2006).DOI:10.1520/D2070-91R1
12、0.2This procedure was adopted from the Cincinnati Milacron Thermal StabilityTest,Cincinnati Milacron Manual 10-SP-89050.3For 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 t
13、he standards Document Summary page onthe ASTM website.4Available from Copper Development Assoc.,2 Greenwich Office Park,Box1840,Greenwich,CT 06836.5Available from American Iron and Steel Institute(AISI),1140 ConnecticutAve.,NW,Suite 705,Washington,DC 20036,http:/www.steel.org.6The sole source of sup
14、ply of the apparatus known to the committee at this timeis Whatman Int.Ltd.,Maidstone,England.7If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation at a meeting of the responsible technical commi
15、ttee,1which you may attend.8The sole source of supply of the apparatus known to the committee at this timeis Millipore Filter Corp.,Bedford,MA.9The sole source of supply of the apparatus known to the committee at this timeis Cincinnati Milacron,4701 Marburg Ave.,Dept 97B Lubricants and Tribology,Cin
16、cinnati,OH 45209.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Reagents6.1 Reagent Grade Heptane(WarningFlammable.Health hazard.)6.2 Reagent Grade Acetone(WarningFlammable.Health hazard.)7.Preparation of Apparatus7.1 Handle the rods at all times using forceps or clean cottongloves.7.2 Catalyst preparationClean the iron and copper cata-lyst rods,whether new or previously used,prior to use.Cleanthe rods with the 320 silicon carbide
