1、Designation:D622598 (Reapproved 2004) Designation: D6225/D6225M 98(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 adopt
2、ion or, in the case of revision, the year 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.1NOTEUnits information was editorially corrected in June 2012.1. Scope1.1 This test m
3、ethod covers the determination of the hiding power of granules on a mineral surfaced roofing sheet. The test isused primarily after an abrasion test has been conducted, to determine the portion of asphaltic compound that has been exposedas a result of the abrasion test.1.2The values stated in SI uni
4、ts are regarded as the standard. The inch-pound units given in parentheses are for information only.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be us
5、ed independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate
6、 safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D4977 Test Method for Granule Adhesion to Mineral Surfaced Roofing by Abrasion3. Summary of Test Method3.1 A sample of mineral surfaced roofing material is ex
7、amined under a magnifying lens and the area left unprotected by granulecover is determined using a transparency overlay with grid lines.4. Significance and Use4.1 This test method is used to determine the extent of coverage of the granular surfacing over the asphaltic coating in a sampleof mineral s
8、urfaced roofing. The results determine compliance with the applicable specification requirements or may be used forcomparative analysis. This test method applies to both “as manufactured” material and material that has weathered or undergoneother types of exposure.5. Apparatus5.1 MagnifierAn optical
9、 magnifier with a fixed power of magnification of 83 and a working field of at least 806 mm2(1.25in.1.25 in.2). .5.2 Transparency Overlay GridA transparency overlay with grid markings. The transparency must be of sufficient size tocover the area abraded by the abrasion test brush described in Test M
10、ethod D4977, 32 by 159 mm (1.251.25 by 6.25 in.)in. withgrid lines oriented to form squares 1.27 mm (0.05 in.)0.05 in. on a side with 2160 squares/32 by 159 mm(1.25mm 1.25 by 6.25in.).in. The grid transparency must be capable of being positioned over the sample and must permit the operator to clearl
11、y viewthe sample and should be partitioned into groups of squares to facilitate counting (see Fig. 1).5.3 Light SourceA high intensity lamp or fluorescent ring light, capable of providing sufficient illumination of the mineralsurfaced sample to be examined.1This test method is under the jurisdiction
12、 of ASTM Committee D08 on Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.04 on Felts andFabrics.Current edition approved Dec. 1, 2004. Published December 2004. Originally approved in 1998. Last previous edition approved in 1998 as D6225981. DOI:10.1520/D6225-98R04.on
13、Felts, Fabrics and Bituminous Sheet Materials.Current edition approved May 1, 2012. Published June 2012. Originally approved in 1998. Last previous edition approved in 2004 as D6225 98 (2004). DOI:10.1520/D6225_D6225M-98R12E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or
14、contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes ha
15、ve been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official do
16、cument.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Test Specimen6.1 Cut a minimum of three 51 by 229 mm (22 by 9 in.)in. or larger specimens. Specimens may be Test Method D4977abrasion test samples.6.2 Care should be taken so t
17、hat granules do not transfer from one specimen to another.7. Preparation of Apparatus7.1 Place the specimen to be examined on a flat surface and arrange the light source and magnifier so that the sample can beplainly viewed.7.2 Abrasion test 51 by 229 mm (22 by 9 in.)in. specimens can be examined by
18、 removing the clamping tray from the abrasiontest machine and clamping the overlay grid directly over the specimen (see Fig. 2).8. Procedure8.1 Remove any loose granules from the specimen with gentle tapping.8.2 Place the overlay grid so that it is in alignment with the area to be examined. In the c
19、ase of abrasion test samples, the 32by 159 mm (1.251.25 by 6.25 in.)in. portion of the grid should be aligned with the abraded area of the sample.NOTE 1If Test Method D4977 abrasion test samples are being evaluated, a felt tip marker can be used to scribe a line at the bottom edge of the testbrush w
20、hile the sample is still in the test fixture. This line can later be used to align the overlay grid with the abrasion pattern of the test brush.8.3 Secure the overlay grid to the sample so that it remains in place during the test.NOTE 2Push pins can be used over a cork of cardboard substrate if an a
21、brasion test clamping tray is not available.8.4 Count and record the number of squares in which one half or more of the total area of the square contains exposed asphalticcoating.9. Calculation9.1 Determine the percentage of exposed asphaltic coating in the sample as follows:AB100! 5 percent exposed
22、 asphalt in the sample (1)D6225_D6225M-98R12E01_1where:A = total number of squares counted in 8.4, andB = total number of squares in the 32 by 159 mm (1.251.25 by 6.25 in.)in. grid area (2160 total squares).9.2 Average the specimen results for each sample to obtain the percentage area of asphaltic c
23、ompound exposed by granulesdisplaced (see Fig. 3).10. Report10.1 Identify the sample and the cause of granule displacement; either abrasion test or other exposure.10.2 Report the average percent of exposed compound for each sample, to the nearest 0.1 %.11. Precision and Bias11.1 A precision and bias
24、 statement for this test method is being developed.12. Keywords12.1 abrasion loss; asphaltic compound; granule displacement; mineral surfaced roofing; weathering exposureD6225/D6225M 98 (2012)12NOTE 1After copying this grid onto transparent film, measure to ensure that the dimensions of the copy are
25、 identical to the original.FIG. 1 Granule Coverage Overlay GridFIG. 2 Granule Loss Versus Percent Compound ExposedD6225/D6225M 98 (2012)13FIG. 3 All Labs Exposure Versus LossASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mention
26、edin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
27、 must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
28、 theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
29、C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6225/D6225M 98 (2012)14
