1、Designation:D6225/D6225M98(Reapproved 2012)1Standard 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 o
2、f last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially corrected in June 2012.1.Scope1.1 This test method covers the determination of the hidingpowe
3、r of granules on a mineral surfaced roofing sheet.The testis used 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 sep
4、arately 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,i
5、f 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:2D4977 Test Method for Granule Adhesion to Mineral
6、 Sur-faced Roofing by Abrasion3.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 d
7、etermine the extent ofcoverage 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 an
8、d material that hasweathered 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 least 806mm21.25 in.2.5.2 Transparency Overlay GridA transparency overlaywith grid markings.The transparency must be of suf
9、ficient sizeto cover the area abraded by the abrasion test brush describedin Test Method D4977,32 by 159 mm 1.25 by 6.25 in.withgrid lines oriented to form squares 1.27 mm 0.05 in.on a sidewith 2160 squares/32 by 159 mm 1.25 by 6.25 in.The gridtransparency must be capable of being positioned over th
10、esample and must permit the operator to clearly view the sampleand should be partitioned into groups of squares to facilitatecounting(see Fig.1).5.3 Light SourceA high intensity lamp or fluorescent ringlight,capable of providing sufficient illumination of the min-eral surfaced sample to be examined.
11、6.Test Specimen6.1 Cut a minimum of three 51 by 229 mm 2 by 9 in.orlarger specimens.Specimens may be Test Method D4977abrasion 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
12、surface 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
13、 is under 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 1,2012.Published June 2012.Originallyapproved in 1998.Last previous edition approved in 200
14、4 as D6225 98(2004).DOI:10.1520/D6225_D6225M-98R12E01.2For 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 AS
15、TM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Procedure8.1 Remove any loose granules from the specimen withgentle tapping.8.2 Place the overlay grid so that it is in alignment with thearea to be examined.In the case of abrasion test samples,the32
16、 by 159 mm 1.25 by 6.25 in.portion of the grid should bealigned with the abraded area of the sample.NOTE1If Test Method D4977 abrasion test samples are beingevaluated,a felt tip marker can be used to scribe a line at the bottom edgeof the test brush while the sample is still in the test fixture.This line canlater be used to align the overlay grid with the abrasion pattern of the testbrush.8.3 Secure the overlay grid to the sample so that it remainsin place during the test.NOTE2Push pins can be u
