1、Designation:D739518Standard Test Method forCone/Plate Viscosity at a 500 s-1Shear Rate1This standard is issued under the fixed designation D7395;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the viscos-ity of paints and related products using a cone/plate viscometerat a shear rate of 500 s-1.1.2
3、 Viscosity values obtained by this method may be used asan alternative to results from No.4 Ford cup measurements.The values from this method do not replicate Ford cup results,but can be used for quality control,producer-user specifica-tions and viscosity reduction in the same manner that Ford cupsa
4、re used.1.3 If viscosity at a higher shear rate is needed,Test MethodD4287,which describes viscosity measurement at 10 000 s-1to12 000 s-1may be used.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are provided forinformation only and are not considere
5、d standard.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior
6、to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarri
7、ers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD4287 Test Method for High-Shear Viscosity Using a Cone/Plate Viscometer3.Summary of Test Method3.1 The material to be tested is placed between the cone andplat
8、e of a cone/plate viscometer set at 25C,a solvent trap islowered,and the specimen is subjected to a shear rate of 500 s-1while the viscosity is measured.4.Significance and Use4.1 This test has been used to measure viscosities ofautomotive topcoats in place of No.4 Ford cup measurementsand has provid
9、ed an equivalent ability to evaluate whether thepaint meets specifications and is sprayable.4.2 The method could be considered as an alternative to No.4 Ford cup and other efflux cup measurements for otherproducts as well.4.3 The type of viscometer described in this method givesbetter temperature co
10、ntrol than Ford and other efflux cups andis expected to give better precision.4.4 This test method is suitable for all paints and relatedmaterials whether they are Newtonian in behavior or not.5.Apparatus5.1 Cone/Plate Type Viscometer with cone/speed combina-tion producing a shear rate of 500 s-1,a
11、nominal torque of 7980mN-m,and fitted with a solvent trap that covers the cone.Forautomotive topcoats,the viscometer must provide a viscositymeasurement range that includes 20 mPas(cP)to 200 mPas(cP)at the above-mentioned shear rate.A spindle 1.5 cm indiameter,with a 1.2 cone angle,operating at 100
12、r/min(rpm)speed has worked well.6.Reagents and Materials6.1 Water or SolventIf the viscometer allows manualzeroing,this should be done in accordance with the manufac-turers directions.Zeroing procedures that require liquids maybe satisfied with water or a low-viscosity solvent such asxylene or miner
13、al spirits.6.2 Mineral OilsOne to three standard mineral oils withknown viscosities(certified by an approved laboratory)lyingbetween 10%and 90%full scale to be used for calibrationverification the instrument.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatin
14、gs,Materials,and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 2007.Last previous edition approved in 2012 as D7395 07(2012).DOI:10.1520/D7
15、395-18.2For 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.*A Summary of Changes section appears at the end of this st
16、andardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 NOTE1Silicone oils should be avoided because of their tendency toconta
