1、Designation:D754009(Reapproved 2019)Standard Practice forDispersion of Chromatic Pigments with a MechanicalMuller1This standard is issued under the fixed designation D7540;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of l
2、ast revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice is intended to be used to disperse achromatic pigment for subsequent testing.1.2 This practice does not apply
3、to white pigments.NOTE1The dispersion portion of Test Method D3022 is similar to thispractice,but it utilizes a miniature sandmill rather than a mechanicalmuller,to disperse the chromatic pigment.NOTE2The dispersion portions of Test Methods D332 and D2745 aresimilar to this practice,but they are int
4、ended for use with white pigments,rather than chromatic pigments.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is th
5、eresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific hazard statements are given in Section 8.1.5 This international standard was developed in accor-dance with
6、 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D33
7、2 Test Method for Relative Tinting Strength of WhitePigments by Visual ObservationD2745 Test Method for Relative Tinting Strength of WhitePigments by Reflectance MeasurementsD3022 Test Method for Color and Strength of Color Pig-ments by Use of a Miniature SandmillE284 Terminology of Appearance3.Term
8、inology3.1 DefinitionsDefinitions of appearance terms used inthis practice may be found in Terminology E284.4.Summary of Practice4.1 Pigments are dispersed in a suitable vehicle with amechanical muller.Test and standard pigments are treatedidentically.Opaque drawdowns may be made from the disper-sio
9、ns and compared for color and strength differences eithervisually or instrumentally.5.Significance and Use5.1 The results obtained with a mechanical muller do notnecessarily correlate directly with an industrial situation wheredifferent dispersing conditions exist.However,dispersion witha mechanical
10、 muller is a quick and inexpensive way to preparespecimens for testing the color and strength of a pigment forroutine quality control.5.2 By following the procedure described in Appendix X1,the conditions for achieving the maximum practical degree ofdispersion with a mechanical muller may be determi
11、ned.Anycolor and strength tests done with the dispersions should becarried out under these conditions.6.Apparatus6.1 Balances(1)A balance sensitive to 10 mg,and(2)ananalytical balance sensitive to 1.0 mg.6.2 Muller,Mechanical,equipped with ground-glass platesto which a variable but known force may b
12、e added in 220-N(50-lbf)increments.The driven glass plate shall have a speedof rotation of between 70 and 120 r/min and the apparatus shallhave an arrangement for pre-setting the number of revolutionsin multiples of 50.See Fig.1 for an example of such a device.6.3 Rubbing SurfacesThe rubbing surface
13、s of the ground-glass plates shall be kept sharp by removing them from themuller and grinding them face-to-face with No.303 opticalemery,or its equivalent,and water.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direc
14、t responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints&Paint Materials.Current edition approved April 1,2019.Published April 2019.Originallyapproved in 2009.Last previous edition approved in 2013 as D7540 09(2013).DOI:10.1520/D7540-09R19.2For referenced ASTM standards,visit t
15、he 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United St
16、atesThis 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 6.4 Small Glass Slab or other nonabsorbent material,suit-able for weighing and mixing pigment pastes.6.5 SpatulaAflexible spatula having a 75 to 150-mm(3 to6-in.)blade.7.Materials7