1、Designation:D7635/D7635M18Standard Test Method forMeasurement of Thickness of Coatings Over FabricReinforcement1This standard is issued under the fixed designation D7635/D7635M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year
2、 of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers measuring the thickness of thecoating over fiber backing or reinforcing fabric.1.2 The values s
3、tated 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 Thi
4、s standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine
5、 the applicability of regulatory limitationsprior to use.1.4 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 iss
6、ued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4434/D4434M Specification for Poly(Vinyl Chloride)Sheet RoofingE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaborat
7、ory Study toDetermine the Precision of a Test MethodMEASUREMENT METHOD3.Principle3.1 The thickness of coating material over fiber,fabric,orscrim can be measured with a standard or digital optical orreflectance microscope.Measurement is made with a calibratedviewing device.4.Apparatus4.1 Microscope,3
8、0 to 100 magnification capability.4.1.1 Light SourceIf the light source on the microscope isnot adequate,use a small high-intensity lamp.4.1.2 Stage Micrometer,25 m 0.001 in.divisions.4.2 Calibrated Viewing DeviceA digital or analog devicedesigned to provide an enlarged electronic image with calibra
9、-tions to provide measurements.5.Calibration Procedure5.1Place a standard reflectance stage micrometer or cali-brated sample blocks in place of the specimen.5.2 Turn on the light source.5.3 Position the viewing device(calibrated reticule or cam-era)such that the scales are superimposed.For electroni
10、cimaging,place the calibrated scale marker on the microscopestage.Focus the viewing device on the specimen.5.4 Calibrate using micrometer or calibrated sample blocksto nearest 10 m.5.5 If using digital image for calibration step,record reso-lution and magnification of calibration image.6.Specimen Pr
11、eparation6.1Make a clean cut perpendicular to the plane of thespecimen,normal to one of the yarn intersections,completelythrough the sheet exposing the area to be measured(see Fig.1).6.2 Remove the razor-cut section and mount with the cutsurface(analytical plane)facing downward into a sample clip.Se
12、cure sample clip in 3.175-cm 1.25-in.sample cup with cap.Use a piece of double-sided tape to securely attach clip to thecap part of the cup.Record sample orientation and positionwithin cup.Multiclips can be used for mounting multiple1This test method is under the jurisdiction ofASTM Committee D08 on
13、 Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.18 onNonbituminous Organic Roof Coverings.Current edition approved Nov.1,2018.Published December 2018.Originallyapproved in 2010.Last previous edition approved in 2010 as D7635/D7635M 10.DOI:10.1520/D7635_D7635M-18.2For r
14、eferenced 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 Cons
15、hohocken,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 Organ
16、ization Technical Barriers to Trade(TBT)Committee.1 samples per mount.Assure all that all samples are orientednormal to the plane of the sample cup cap.6.3 Mixed long-cure epoxy at a ratio of 6.3 parts resin to onepart hardener,per volume.A 3.175-cm 1.25-in.mountrequires 19 ml of epoxy.6.4 The mounts are allowed to cure for at least 24 h atambient temperature and humidity.6.5 After curing(24 hours),polish using the procedureexhibited in Table 1.Clean and dry mounts after each step toinsure that
