1、Designation:D233802(Reapproved 2013)Standard Test Method forDetermining Particle Size of Multicolor Lacquers1This standard is issued under the fixed designation D2338;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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 test method employs photographic reference stan-dards to evaluate the particle size of multicolor lacquers.1.2 The values st
3、ated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.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 establish appro-priate safety and heal
4、th practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Adjuncts:Grain Sizes(5 photos)23.Summary of Test Method3.1 The samples to be tested are mixed by pouring from onecontainer to another until they are uniform in consistencybefore sprayi
5、ng on coated white paper stock.After the lacquersare dry they are compared with photographic reference stan-dards to determine the particle size.4.Significance and Use4.1 This test method provides a uniform nomenclature forthe producer and user in the identification of the variousparticle sizes used
6、 in the manufacture of nitrocellulose-typemulticolor lacquers.5.Reference Standards5.1 The photographic reference standards2were prepared byphotographing actual sprayed panels of multicolor lacquersthat were made in the five particle sizes normally used incommercial multicolor lacquers.The standard
7、designations areas follows(Fig.1(a),1(b),1(c):fine,small,medium,large,and extra large,and represent the correct nomenclature forproperly applied multicolor lacquer.6.Apparatus6.1 Spray Gun,pressure-feed internal-mix type,tip 2.2 mm(0.086 in.)in diameter with wide-spray nozzle.7.ProcedureNOTE1The par
8、ticle size of multicolor lacquer is dependent upon thespray conditions during the application procedure.In order to get uniformresults the exact spray conditions should be agreed upon between thepurchaser and the seller.7.1 Spray the lacquer on a coated white paper panel with thefluid and atomizing
9、pressures adjusted to give a spreading rateof 3.7 to 4.9 m2/L(150 to 200 ft2/gal)for complete coveringand 4.9 to 7.35 m2/L(200 to 300 ft2/gal)for scatter coatapplication.After the sprayed lacquer is thoroughly dry,determine the particle size on the panel by comparing it to thephotographic reference
10、standards.28.Precision and Bias8.1 Precision:8.1.1 This test method entails the use of visual judgment andas such does not readily lend itself to a precision statement.8.1.2 In general there has been good agreement betweenoperators in judgment of particle size.8.2 Bias:8.2.1 No information can be pr
11、esented on the bias of theprocedure in Test Method D2338 for measuring particle sizebecause no material having an accepted reference value isavailable.9.Keywords9.1 lacquer;multicolor lacquers;particle size1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings
12、,Materials,and Applications and is the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 1,2013.Published July 2013.Originally approvedin 1965.Last previous edition approved in 2007 as D2338 02(2007).DOI:10.1520/D2338-02R13.2G
13、lossy prints of the photographic reference standards showing various particlesizes are available at nominal charge fromASTM International Headquarters.OrderAdjunct ADJD2338.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 FineSmallFIG.1(a)
14、Particle Size(for other particle sizes,see Figs.1(b)and 1(c)MediumLargeFIG.1(b)Particle Size(for other particle sizes,see Figs.1(a)and 1(c)(continued)D2338 02(2013)2 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin thi
15、s standard.Users of this 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 re
16、viewed every five years 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 committee,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