ASTM_F_2217_-_F_2217M_-_13.pdf

Designation:F2217/F2217M13Standard Practice forCoating/Adhesive Weight Determination1This standard is issued under the fixed designation F2217/F2217M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for determining theamount of coating applied to a substrate,(for example,film,paper,nonwoven).The amount of coating is expressed as aweight per given area,(for example,g/m2,lb/ream).1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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:2E171/E171M Practice for Conditioning and Testing FlexibleBarrier Packaging3.Terminology3.1 coatinga material applied to enhance the characteris-tics of the base substrates.For this practice,the coating must besoluble in the chosen solvent.3.2 ream500 sheets of 609.6 by 914.4 mm(24 by 36 in.)equal to 278.7 m2(3000 ft2).NOTE1Other ream sizes may be in use.If using a ream size other than278.7 m2(3000 ft2),the conversion factor K(located in the appendix)must be recalculated if reporting results as lb/ream.4.Summary of Practice4.1 Representative samples of coated material are weighed,coating is removed using a solvent appropriate for the coating,samples are dried and weighed again.The differential obtainedis the coating weight.4.2 Typical methodology is as follows:4.2.1 Cut representative samples using a cutting device anda template of known unit area“A”mm2(in.2),for example,203.2 by 50.8 mm(8 by 2 in.)template.4.2.2 Weigh each sample on the analytical balance to thenearest 0.0001 g and record the value“W1.”Samples may befolded and placed on to the analytical balance.NOTE2If sample is conditioned weigh immediately.4.2.3 Using solvent in which the coating is soluble and thesubstrate is insoluble,remove coating from substrate.Typicalmethods are wiping with solvent saturated cloth,immersingsamples in solvent to soften,then wiping with cloth or brush,if needed,or immersing sample,agitating to soften,thenwiping with cloth or brush.For specific recommendationscontact the coated substrate supplier.NOTE3Accumulated coating in solvent,cloth or brush can reduce theability to clean sample properly and may affect test results.4.2.4 Thoroughly dry the substrate with a drying appliance.A timer should be used to ensure consistency in immersion,cleaning and drying time.Drying of hygroscopic materialsshould be consistent with conditioning parameters.4.2.5 Re-weigh each sample on the analytical balance to thenearest 0.0001 g and record the value“W2.”4.2.6 Calculate and report the adhesive coat weight usingthe following equation:Adhesive Coat Weight5SKW12 W2!APD(1)where:W1=weight of coated substrate,g,W2=weight of uncoated substrate,g,A=area of substrate,mm2(in.2),P=fraction of substrate that is coated(P=1 except forzone coated materials),andK=constant(see below).4.2.7 When coat weight is expressed in g/m2:1This practice is under the jurisdiction of ASTM Committee F02 on FlexibleBarrier Packaging and is the direct responsibility of Subcommittee F02.20 onPhysical Properties.Current edition approved April 1,2013.Published June 2013.Originallyapproved in 2002.Last previous edition approved in 2012 as F2217 02(2012).DOI:10.1520/F2217-13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 K 5 1 3106mm2/m2(2)4.2.8 When coat weight is expressed in lb/ream:K 5 952.4Sin.2lbreamgD(3)NOTE4For explanation of how K is determined,see Appendix X1.5.Significance and Use5.1 Coating weight is an indicator of certain functionalcharacteristics of coated substrates(for example,sealability,peelability,appearance).The methodology described in thispractice is a means of determining coat weight.5.2 This practice does not address acceptability criteria.These need to be jointly determined by the user and producerof the product.5.3 The methodology described in this practice includesoperator assessment of effective coating removal.This is asubjective assessment and requires operator training for