ASTM D7395-2018 red 1875 Standard Test Method for Cone Plate Viscosity at a 500 s-1 Shear Rate.pdf

1、Designation: D7395 07 (Reapproved 2012)D7395 18Standard Test Method forCone/Plate Viscosity at a 500 s-1 Shear 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

2、 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. Scope Scope*1.1 This test method covers the determination of the viscosity of paints and related products using a cone/plat

3、e viscometer ata shear rate of 500 s-1.1.2 Viscosity values obtained by this method may be used as an alternative to results from No. 4 Ford cup measurements. Thevalues from this method do not replicate Ford cup results, but can be used for quality control, producer-user specifications andviscosity

4、reduction in the same manner that Ford cups are used.1.3 If viscosity at a higher shear rate is needed, Test Method D4287, which describes viscosity measurement at 10 000 s-1 to12 000 s-1 may be used.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are

5、included in this The valuesgiven in parentheses are provided for information only and are not considered standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate s

6、afety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Dev

7、elopment of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D3925 Practice for Sampling Liquid Paints and Related Pigmented CoatingsD4287 Test Method for High-Shear Viscos

8、ity Using a Cone/Plate Viscometer3. Summary of Test Method3.1 The material to be tested is placed between the cone and plate of a cone/plate viscometer set at 25C, a solvent trap islowered, and the specimen is subjected to a shear rate of 500 s-1 while the viscosity is measured.4. Significance and U

9、se4.1 This test has been used to measure viscosities of automotive topcoats in place of No. 4 Ford cup measurements and hasprovided an equivalent ability to evaluate whether the paint meets specifications and is sprayable.4.2 The method could be considered as an alternative to No. 4 Ford cup and oth

10、er efflux cup measurements for other productsas well.4.3 The type of viscometer described in this method gives better temperature control than Ford and other efflux cups and isexpected to give better precision.4.4 This test method is suitable for all paints and related materials whether they are New

11、tonian in behavior or not.1 This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints r/min (rpm); slower rotation speeds may require longe

12、r run times, in accordancewith manufacturers recommendation).9.4 Start the cone rotating (make sure that the solvent trap is not 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, usi

13、ng a clean, lint-free soft cloth or tissue and a suitable solvent. Thecone spindle may be removed from the apparatus for this cleaning. Take care to remove all the test material and cleaning solvent,but minimize sideways pressure on the cone shaft to avoid bending it. Do not use cleaning utensils th

14、at may damage the apparatus.Metal cleaning tools must never be used.10. Report10.1 Report the following information:10.1.1 Reference to this test method and the viscometer used.10.1.2 Identification of the product under test.10.1.3 Cone used.10.1.4 Viscometer in r/min (rpm) speed used.10.1.5 Test re

15、sult in cP (= mPa.s) mPas (cP) to the nearest 0.1 cP.mPas (cP).11. Precision and Bias11.1 PrecisionNoASTM interlaboratory testing has yet been carried out on this method, but estimates of precision have beenmade based on experience with the method.11.1.1 RepeatabilityTwo test results in the range 20

16、 mPas (cP) to 200 cP mPas (cP) obtained by the same operator shouldbe considered suspect if they differ by more than 3 % relative.11.1.2 ReproducibilityTwo results in the range 20 mPas (cP) to 200 cP mPas (cP) obtained by operators in differentlaboratories should be considered suspect if they differ

17、 by more than 10 % relative.11.2 BiasSince there is no accepted reference material suitable for determining the bias for the procedure in this test method,bias has not been determined.12. Keywords12.1 No. 4 Ford cup-alternative to; cup-alternative; rheology-paints/related coatings/materials; viscome

18、ter-cone/plate; viscosity-paints/related coatings/materialsSUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue (D7395-07(2012) that may impact the use of this standard. (Approved June 1, 2018.)(1) In sections 5.1 and 9.2, a trademarke

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