1、Designation:D82318(Reapproved 2022)Standard Practices forProducing Films of Uniform Thickness of Paint,Coatingsand Related Products on Test Panels1This standard is issued under the fixed designation D823;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e case of revision,the year 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 Five pr
3、actices are given for preparing films of uniformthickness of coatings on test panels.These practices are:Practice AAutomated Spray Machine ApplicationPractice BMotor-Driven Dip Coater ApplicationPractice CMotor-Driven Blade Film ApplicationPractice DHand-Held Spray Gun ApplicationPractice EHand-Held
4、 Blade Film Application1.2 The use of wire-wound drawdown bars as described inPractice D4147 may also be an appropriate method forproducing films of uniform coating thickness.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1
5、.4 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 to use.1.5 T
6、his 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 TechnicalBarriers to Trade
7、(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1212 Test Methods
8、for Measurement of Wet Film Thick-ness of Organic CoatingsD3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD4147 Practice for Applying Coil Coatings Using Wire-Wound Drawdown BarsD4285 Test Method for Indicating Oil or Water in Com-
9、pressed AirD4414 Practice for Measurement of Wet Film Thickness byNotch GagesD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous MetalsPRACTICE AAUTOMATED SPRAY MACHINEAPPLI
10、CATION3.Summary of Practices3.1 A liquid material is applied to a test panel by means ofan automated spray machine consisting of a mounted spray gunand a panel holder.This machine can(1)move the panelholder,with test panel,at a uniform speed through theatomized spray produced by a fixed spray gun,or
11、(2)it canmove the gun,with atomized spray,at a uniform speed past thetest panel(s)mounted on a fixed panel holder.A machineequipped with a programmable system can index the spray gunvertically for multiple passes and for multiple coats withselective time delay.3.2 The thickness of coating applied is
12、 controlled by thetraverse speed of the panel or gun,the fluid delivery rate of thegun,the spray gun tip size,the viscosity of the material,and theamount of nonvolatile matter in the material.4.Significance and Use4.1 This practice should be used for those coatings that aredesigned for spray applica
13、tions of objects in the factory or in1These practices are under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and are the direct responsibilityof Subcommittee D01.23 on Physical Properties of Applied Paint Films.Current edition approved June 1,2022.Pu
14、blished June 2022.Originallyapproved in 1945.Last previous edition approved in 2018 as D823 18.DOI:10.1520/D0823-18R22.2For 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 th
15、e standards Document Summary page onthe ASTM website.Copyright 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 De
16、cision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1the field.It is particularly important that it be used in theevaluation of metallic coatings for appearance properties,suchas gloss and color.4.2 Coatings applied by this test method may exhibit a slightorange-peel or spray wave.5.Apparatus5.1 Test Panels,of any clean,planar rigid substrate with auniform surface of a size