1、Designation:D6225/D6225M98(Reapproved 2020)Standard Test Method forGranule Cover of Mineral-Surfaced Roofing1This standard is issued under the fixed designation D6225/D6225M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of
2、 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 the determination of the hidingpower of granules on a mineral-surfaced roofing sheet.The testis us
3、ed primarily after an abrasion test has been conducted todetermine the portion of asphaltic compound that has beenexposed as a result of the abrasion test.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
4、exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith 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 use
5、r of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in th
6、e 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:2D4977/D4977M Test Method for Granule Adhesion to Min-eral Surfaced Roofing by A
7、brasion3.Summary of Test Method3.1 A sample of mineral-surfaced roofing material is exam-ined under a magnifying lens and the area left unprotected bygranule cover is determined using a transparency overlay withgrid lines.4.Significance and Use4.1 This test method is used to determine the extent ofc
8、overage of the granular surfacing over the asphaltic coating ina sample of mineral-surfaced roofing.The results determinecompliance with the applicable specification requirements ormay be used for comparative analysis.This test method appliesto both“as manufactured”material and material that hasweat
9、hered or undergone other types of exposure.5.Apparatus5.1 MagnifierAn optical magnifier with a fixed power ofmagnification of 8 and a working field of at least806 mm21.25 in.2.5.2 Transparency Overlay GridA transparency overlaywith grid markings.The transparency must be of sufficient sizeto cover th
10、e area abraded by the abrasion test brush describedin Test Method D4977/D4977M,32 by 159 mm 1.25 by 6.25in.with grid lines oriented to form squares 1.27 mm 0.05 in.on a side with 2160 squares/32 by 159 mm 1.25 by 6.25 in.The grid transparency must be capable of being positioned overthe sample and mu
11、st permit the operator to clearly view thesample and should be partitioned into groups of squares tofacilitate counting(see Fig.1).5.3 Light SourceA high-intensity lamp or fluorescent ringlight,capable of providing sufficient illumination of themineral-surfaced sample to be examined.6.Test Specimen6
12、.1 Cut a minimum of three 51 by 229 mm 2 by 9 in.orlarger specimens.Specimens may be Test Method D4977/D4977M abrasion test samples.6.2 Care should be taken so that granules do not transferfrom one specimen to another.7.Preparation of Apparatus7.1 Place the specimen to be examined on a flat surface
13、andarrange the light source and magnifier so that the sample can beplainly viewed.7.2 Abrasion test 51 by 229 mm 2 by 9 in.specimens canbe examined by removing the clamping tray from the abrasiontest machine and clamping the overlay grid directly over thespecimen(see Fig.2).1This test method is unde
14、r the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.04 on Felts,Fabrics and Bituminous Sheet Materials.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 1998.Last previous edition approved in 2012 as D622
15、5/D6225M 98(2012).DOI:10.1520/D6225_D6225M-98R20.2For 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 In
16、ternational,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.8.Procedure8.1 Remove any loose granules from the specimen withgentle tapping.8.2 Place the ove
