ASTM_D_6132_-_13.pdf

Designation:D613213Standard Test Method forNondestructive Measurement of Dry Film Thickness ofApplied Organic Coatings Using an Ultrasonic CoatingThickness Gage1This standard is issued under the fixed designation D6132;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.Scope*1.1 This test method describes the use of ultrasonic filmthickness gages to measure accurately and nondestructively thedry film thickness of organic coatings applied over a substrateof dissimilar material.Measurements may be made on fieldstructures,on commercially manufactured products,or onlaboratory test specimens.These types of gages can accuratelymeasure the dry film thickness of organic coatings on a varietyof substrates such as concrete,wood,wallboard,plastic,fibercomposites and metal.1.2 This test method is not applicable to coatings that willbe readily deformable under load of the measuring instrumentas the instrument probe is placed directly on the coating surfaceto take a reading.1.3 The effective range of instruments using the principle ofultrasonics is limited by gage design.Athickness range of 8 mto 7.60 mm(0.3 to 300 mils)has been demonstrated.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD4138 Practices for Measurement of Dry Film Thickness ofProtective Coating Systems by Destructive,Cross-Sectioning MeansE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 SSPCThe Society for Protective Coatings Standards:3PA 2 Procedure for Determining Conformance to Dry Coat-ing Thickness RequirementsPA 9 Measurement of Dry Organic Coating Thickness onCementitious Substrates Using Ultrasonic Gages2.3 ASMEThe American Society of Mechanical Engi-neers:4B46.1 Surface Texture(Surface Roughness,Waviness,andLay)3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accuracy,nthe measure of the magnitude of errorbetween the result of a measurement and the true thickness ofthe item being measured.3.1.1.1 DiscussionAn accuracy statement predicts theability of a coating thickness gage to measure the true thicknessof a coating to be measured.Accuracy statements provide theperformance capability across the full functional measurementrange of the gage.Accuracy statements frequently include afixed portion that remains constant across the measurementrange,plus a variable portion that is related to the measurementresult for a particular thickness.3.1.2 adjustment,nthe physical act of aligning a gagesthickness readings to match those of a known thickness sample(removal of bias),in order to improve the accuracy of the gageon a specific coating.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.23 on Physical Properties of Applied Paint Films.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 1997.Last previously edition approved in 2008 as D6132 08.DOI:10.1520/D6132-13.2For 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.3Available from Society for Protective Coatings(SSPC),40 24th St.,6th Floor,Pittsburgh,PA 15222-4656,http:/www.sspc.org.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.2.1 DiscussionAn adjustment will affect the outcomeof subsequent readings.3.1.3 calibration,nthe high-level,controlled and docu-mented process of obtaining measurements on traceable cali-bration standards over the full operating range of the gage,thenmaking the necessary gage modification(as required)to correctany out-of-tolerance conditions.3.1.3.1 DiscussionCalibration of coating thickness gagesis typically perfo