ASTM_D_5327_-_97_2013.pdf

Designation:D532797(Reapproved 2013)Standard Practice forEvaluating and Comparing Transfer Efficiency of SprayApplied Coatings Under General Laboratory Conditions1This standard is issued under the fixed designation D5327;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.1.Scope1.1 This practice covers the evaluation and comparison ofthe transfer efficiency of spray-applied coatings under generallaboratory conditions.Transfer efficiency is the ratio of paintsolids deposited to the total paint solids used during theapplication process,expressed as a percent.This practice canbe used to study the effect on transfer efficiency of changingoperating variables and paint formulations.Key variables thatneed to be controlled are listed in 8.13.NOTE1It is important that all process or formulation parameters,except that which is intentionally being changed,be kept consistent fromtest to test.If not done,the results of the study are to be questioned.1.2 The reproducibility of this practice is highly dependenton the degree of control of the parameters listed in Section 8 ofthe practice.1.3 LimitationsThis laboratory practice indicates only thedirection of the effect of operating variables and liquid paintformulations on transfer efficiency under conditions of thelaboratory test:the magnitude of the effect can be determinedonly with specific plant experience.In fact,the nature of thecritical parameters that affect transfer efficiency makes clearthat it is not possible to extrapolate laboratory results.NOTE2The laboratory practice outlined involves general laboratoryspray equipment and procedures and is derived from Test Method D5009.This practice and Test Method D5009 are both derived from a study andreport of transfer efficiency measurements conducted for the U.S.Envi-ronmental Protection Agency.For laboratories that have access to aconveyor and mass flow measurement equipment,a suitable,potentiallymore reproducible,tested method is defined in Test Method D5009.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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.For specific hazardstatements see Section 7,Note 8 and Note 9.2.Referenced Documents2.1 ASTM Standards:2D1200 Test Method for Viscosity by Ford Viscosity CupD2369 Test Method for Volatile Content of CoatingsD3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD5009 Test Method for Evaluating and Comparing TransferEfficiency of Spray Applied Coatings Under LaboratoryConditions2.2 Other Standards:NFPA 33 Spray Application Using Flammable and Combus-tible Materials3NFPA 86 Standard for Ovens and Furnaces33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fluid mass flow rate,nthe mass flow rate of paint ingrams per minute during the test.3.1.2 mass of foil,nthe weight of each target foil in gramsbefore being painted.3.1.3 mass of foil plus paint solids,nthe weight of eachtarget foil in grams after being painted and baked.3.1.4 mass of paint solids,nthe difference in the mass ofthe foil before painting and the mass of the foil after paintingand baking.The sum of the mass of the foil plus paint solidsless the sum of the mass of the foil.3.1.5 transfer effciency,nthe ratio of the mass of the paintsolids deposited on the foil to the mass of the paint solidssprayed during the test,expressed as a percent.3.1.6 weight percent solids,nthe solids content as percentof the total weight of a sample of the paint used during the test.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,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 1992.Last previous edition approved in 2007 as D5327 97(2007).DOI:10.1520/D5327-97R13.2For 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.3Available from National Fire Protection Association(NFPA),1 BatterymarchPark,Quincy,MA 02169-7471,http:/www.nfpa.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6.1 DiscussionWeight percent solids are determinedas specified in 8.4.2.4.Summary of Practice4.1 Metal panels covered with preweighed alumi