ASTM_D_8136_-_17.pdf

Designation:D813617Standard Test Method forDetermining Plastic Film Thickness and ThicknessVariability Using a Non-Contact Capacitance ThicknessGauge1This standard is issued under the fixed designation D8136;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 test method covers the determination of the thick-ness of plastic film,ranging in thickness from 2.5 to 250 m,with a non-contact thickness gauge that uses capacitance-basedtechnology.It includes a method to generate a series ofthickness data points that can be used to characterize thevariability patterns of film for both transverse or machinedirection(profiling).NOTE1Thicker specimens,typically 250 m to 2500 m thick,canutilize this test method if the apparatus is designed to measure and handlematerials of this thickness range,and the apparatus complies with therequirements as defined in this standard.1.2 This test method provides a method for buyers andsellers of film to communicate the thickness and pattern ofthickness variability of the product they are buying/selling.1.3 This test method does not apply to textured or porousfilms or films that are conductive or coated with a conductivesubstance.NOTE2Films that contain excessive levels of anti-static additive canbe conductive and need to be tested to verify that they do not cause anegative reading on the instrument.1.4 UnitsThe values stated in SI units are to be regardedas the standard.No other units of measurement are included inthis standard.NOTE3There is no known ISO equivalent to this standard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This 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(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD4805 Terminology for Plastics Standards(Withdrawn2002)3D6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE252 Test Method for Thickness of Foil,Thin Sheet,andFilm by Mass MeasurementE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 472 PlasticsVocabulary43.Terminology3.1 DefinitionsSee Terminologies D883,D4805,D6988,and ISO 472 for definitions pertinent to this test method.3.2 Definitions of Terms Specific to This Standard:3.2.1 calibration,nset of operations that establishes,un-der specified conditions,the relationship between values mea-sured or indicated by an instrument or system and the corre-sponding reference standard or known values derived from theappropriate reference standards.1This is under the jurisdiction of ASTM Committee D20 on Plastics and is thedirect responsibility of Subcommittee D20.19 on Film,Sheeting,and MoldedProducts.Current edition approved Sept.1,2017.Published September 2017.DOI:10.1520/D8136-17.2For 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.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.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 Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.2 calibration recipe,ncomputer-stored calibration thatrelates the response of the instrument to a thickness or basisweight of a given specimen.3.2.3 guide posts,nposts that protrude from the front faceof a profiler apparatus that apply tension and help guide thespecimen as it is profiled.3.2.4 guide tray,ntray,which can also include a weightthat is placed on top of the film,that protrudes from the frontface of a profiler