1、Designation: D 7395 07Standard Test Method forCone/Plate Viscosity at a 500 s-1Shear Rate1This standard is issued under the fixed designation D 7395; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the viscos-ity of paints and related products using a cone/plate viscometerat a shear rate of
3、 500 s-1.1.2 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 t
4、hat Ford cupsare used.1.3 If viscosity at a higher shear rate is needed, Test MethodD 4287, which describes viscosity measurement at 10 000 to12 000 s-1may be used.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 This st
5、andard 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 regulatory limitations prior to use.2. Referenced Documents2.1
6、 ASTM Standards:2D 3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD 4287 Test Method for High-Shear Viscosity Using aCone/Plate Viscometer3. Summary of Test Method3.1 The material to be tested is placed between the cone andplate of a cone/plate viscometer set at 25C, a solvent
7、 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 provided an equivalent ability to evaluate whether t
8、hepaint 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 control than Ford and other efflux cups andis ex
9、pected 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-1and fitted with a solventtrap that covers the co
10、ne. For automotive topcoats, the viscom-eter must provide a viscosity measurement range that includes20 to 200 cP (= mPa.s) at the above-mentioned shear rate. ABrookfield CAP1000+ or CAP2000+ with a #10 cone at 100rpm shaft speed has worked well.6. Reagents and Materials6.1 Water or SolventIf the vi
11、scometer 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 mineral spirits.6.2 Mineral OilsOne to three standard mineral oils withknown viscosities
12、 (certified by an approved laboratory) lyingbetween 10 and 90 % full scale to be used for calibrating theinstrument. If a single oil is used, its viscosity should be similarto that of the materials being tested.NOTE 1Silicone oils should be avoided because of their tendency tocontaminate instruments
13、, containers and other equipment.7. Sampling7.1 Take a representative sample of the product to be testedin accordance with Practice D 3925. If the sample has atendency to settle or separate on standing, then it must bestirred or shaken until homogeneous before a test specimen is1This test method is
14、under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints slower rotation speeds may require longerrun times, in accordance with manufacturers recommenda-tion).
15、9.4 Start the cone rotating (make sure that the solvent trap isnot touching the cone shaft) and record the reading after 15 s.9.5 Raise the solvent trap, followed by the cone.9.6 Clean both the cone (in-place) and the plate carefully,using a clean, lint-free soft cloth or tissue and a suitablesolven
16、t. Take care to remove all the test material and cleaningsolvent, but minimize sideways pressure on the cone shaft toavoid bending it. Do not use cleaning utensils that may damagethe apparatus. Metal cleaning tools must never be used.10. Report10.1 Report the following information:10.1.1 Reference t
17、o this test method and the viscometerused.10.1.2 Identification of the product under test.10.1.3 Cone used.10.1.4 Viscometer (rpm) speed used.10.1.5 Test result in cP (= mPa.s) to the nearest 0.1 cP.11. Precision and Bias11.1 PrecisionNo ASTM interlaboratory testing has yetbeen carried out on this m
18、ethod, but estimates of precisionhave been made based on experience with the method.11.1.1 RepeatabilityTwo test results in the range 20 to200 cP obtained by the same operator should be consideredsuspect if they differ by more than 3 % relative.11.1.2 ReproducibilityTwo results in the range 20 to 20
19、0cP obtained by operators in different laboratories should beconsidered suspect if they differ by more than 10 % relative.11.2 BiasSince there is no accepted reference materialsuitable for determining the bias for the procedure in this testmethod, bias has not been determined.12. Keywords12.1 No. 4
20、Ford cup-alternative to; rheology-paints/relatedcoatings/materials; viscometer-cone/plate; viscosity-paints/related coatings/materialsD7395072ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of thi
21、s standard are expressly advised that determination 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 yea
22、rs andif not revised, either reapproved or withdrawn. 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 commit
23、tee, which you may attend. If you feel that 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).D7395073
