1、Designation: D 6225 98 (Reapproved 2004)Standard Test Method forGranule Cover of Mineral Surfaced Roofing1This standard is issued under the fixed designation D 6225; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 u
3、sed 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 SI units are regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.3 This stand
4、ard 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 AS
5、TM Standards:2D 4977 Test Method for Granule Adhesion to MineralSurfaced 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 withgri
6、d lines.4. Significance and Use4.1 This test method is used to determine 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 ana
7、lysis. This test method appliesto both “as manufactured” material and material that hasweathered or undergone other types of exposure.5. Apparatus5.1 MagnifierAn optical magnifier with a fixed power ofmagnification of 83 and a working field of at least 806mm2(1.25 in.2).5.2 Transparency Overlay Grid
8、A transparency overlaywith grid markings. The transparency must be of sufficient sizeto cover the area abraded by the abrasion test brush describedin Test Method D 4977, 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
9、 (1.25 by 6.25 in.). The gridtransparency must be capable of being positioned over thesample 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, capa
10、ble of providing sufficient illumination of the min-eral surfaced sample to be examined.6. Test Specimen6.1 Cut a minimum of three 51 by 229 mm (2 by 9 in.) orlarger specimens. Specimens may be Test Method D 4977abrasion test samples.6.2 Care should be taken so that granules do not transferfrom one
11、specimen to another.7. Preparation of Apparatus7.1 Place the specimen to be examined on a flat 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 abrasio
12、ntest machine and clamping the overlay grid directly over thespecimen (see Fig. 2).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 by 159 mm (
13、1.25 by 6.25 in.) portion of the grid should bealigned with the abraded area of the sample.1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.04 on Feltsand Fabrics.Current edition approved Dec. 1, 2004. P
14、ublished December 2004. Originallyapproved in 1998. Last previous edition approved in 1998 as D 6225 98e1.2For 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 standa
15、rds Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1If Test Method D 4977 abrasion test samples are beingevaluated, a felt tip marker can be used to scribe a line at the bottom edgeof th
16、e 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.NOTE 2Push pins can be used over a cork of cardboard substr
17、ate if anabrasion test clamping tray is not available.8.4 Count and record the number of squares in which onehalf or more of the total area of the square contains exposedasphaltic coating.9. Calculation9.1 Determine the percentage of exposed asphaltic coatingin the sample as follows:AB100! 5 percent
18、 exposed asphalt in the sample (1)where:A = total number of squares counted in 8.4, andB = total number of squares in the 32 by 159 mm (1.25 by6.25 in.) grid area (2160 total squares).9.2 Average the specimen results for each sample to obtainthe percentage area of asphaltic compound exposed by gran-
19、ules displaced (see Fig. 3).10. Report10.1 Identify the sample and the cause of granule displace-ment; either abrasion test or other exposure.10.2 Report the average percent of exposed compound foreach sample, to the nearest 0.1 %.11. Precision and Bias11.1 A precision and bias statement for this te
20、st method isbeing developed.12. Keywords12.1 abrasion loss; asphaltic compound; granule displace-ment; mineral surfaced roofing; weathering exposureNOTE 1After copying this grid onto transparent film, measure to ensure that the dimensions of the copy are identical to the original.FIG. 1 Granule Cove
21、rage Overlay GridD 6225 98 (2004)2FIG. 2 Granule Loss Versus Percent Compound ExposedD 6225 98 (2004)3FIG. 3 All Labs Exposure Versus LossASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this st
22、andard 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 must be reviewed every five years a
23、ndif 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 theresponsible technical committee,
24、 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 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).D 6225 98 (2004)4
