ASTM_D_823_-_95_2012e1.pdf

Designation:D82395(Reapproved 2012)1Standard Practices forProducing Films of Uniform Thickness of Paint,Varnish,and 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 the 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.1NOTEFigure 3 was replaced and Section 18 was editorially corrected in November 2012.1.Scope1.1 Five practices are given for preparing films of uniformthickness of coatings on test panels.These practices are:Practice AAutomatic Spray Machine ApplicationPractice BMotor-Driven Dip Coater ApplicationPractice CMotor-Driven Blade Film ApplicationPractice DHand-Held Spray Gun ApplicationPractice EHand-Held Blade Film Application1.2 The values stated in SI units are to be regarded as thestandard.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 health practices and determine the applica-bility of regulatory limitations prior to use.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 MicrometersD1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Ferrous Base(Withdrawn 2006)3D1212 Test Methods for Measurement of Wet Film Thick-ness of Organic CoatingsD1400 Test Method for Nondestructive Measurement of DryFilm Thickness of Nonconductive Coatings Applied to aNonferrous Metal Base(Withdrawn 2006)3D3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsPRACTICE AAUTOMATIC SPRAY MACHINEAPPLICATION3.Summary of Practices3.1 A liquid material is applied to a test panel by means ofan automatic 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(2)it canmove the gun,with atomized spray,at a uniform speed past thetest panel 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 controlled by thetraverse speed of the panel or gun,the fluid delivery rate of thegun,the viscosity of the material,and the amount of nonvola-tile matter in the material.4.Significance and Use4.1 These practices should be used for those coatings thatare designed for spray applications of objects in the factory orin the 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 smooth,planar material of a size thatcan be accommodated by the panel holder of the automaticspray machine.1These 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 Nov.1,2012.Published November 2012.Originallyapproved in 1945.Last previous edition approved in 2007 as D823 95(2007).DOI:10.1520/D0823-95R12E01.2For 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 the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.1 When steel panels are used,they should be prepared inaccordance with the appropriate method in Practice D609.5.2 Automatic Spray Machine,equipped with a panel holderand a mounting for a spray gun.The machine shall be designedto move the panel holder at a uniform speed past the fixed gunmount,or designed to move the gun mount at a uniform speedpast the fixed panel holder.The panel holder or the gun mounttraverse speed shall be adjustable from 7.5 to 30 m(25 to 100ft)/min.Typical machines are shown in Fig.1.NOTE1Some automatic spray machines provide additional featuresthat can improve the uniformity of film preparation.Some examples are:a z-bar panel holder;indexing of the panel holder at right