ASTM D6225/D6225M-98(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D6225/D6225M −98 (Reapproved 2020)
Standard Test Method for
Granule Cover of Mineral-Surfaced Roofing
This standard is issued under the fixed designation D6225/D6225M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the hiding 4.1 This test method is used to determine the extent of
powerofgranulesonamineral-surfacedroofingsheet.Thetest coverageofthegranularsurfacingovertheasphalticcoatingin
is used primarily after an abrasion test has been conducted to a sample of mineral-surfaced roofing. The results determine
determine the portion of asphaltic compound that has been compliance with the applicable specification requirements or
exposed as a result of the abrasion test. maybeusedforcomparativeanalysis.Thistestmethodapplies
to both “as manufactured” material and material that has
1.2 The values stated in either SI units or inch-pound units
weathered or undergone other types of exposure.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
5. Apparatus
system shall be used independently of the other. Combining
5.1 Magnifier—An optical magnifier with a fixed power of
values from the two systems may result in nonconformance
magnification of 8× and a working field of at least
with the standard.
2 2
806mm [1.25 in. ].
1.3 This standard does not purport to address all of the
5.2 Transparency Overlay Grid—A transparency overlay
safety concerns, if any, associated with its use. It is the
withgridmarkings.Thetransparencymustbeofsufficientsize
responsibility of the user of this standard to establish appro-
to cover the area abraded by the abrasion test brush described
priate safety, health, and environmental practices and deter-
in Test Method D4977/D4977M, 32 by 159 mm [1.25 by 6.25
mine the applicability of regulatory limitations prior to use.
in.] with grid lines oriented to form squares 1.27 mm [0.05 in.]
1.4 This international standard was developed in accor-
on a side with 2160 squares/32 by 159 mm[1.25 by 6.25 in.].
dance with internationally recognized principles on standard-
Thegridtransparencymustbecapableofbeingpositionedover
ization established in the Decision on Principles for the
the sample and must permit the operator to clearly view the
Development of International Standards, Guides and Recom-
sample and should be partitioned into groups of squares to
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. facilitate counting (see Fig. 1).
5.3 Light Source—Ahigh-intensity lamp or fluorescent ring
2. Referenced Documents
light, capable of providing sufficient illumination of the
2.1 ASTM Standards:
mineral-surfaced sample to be examined.
D4977/D4977MTest Method for GranuleAdhesion to Min-
eral Surfaced Roofing by Abrasion
6. Test Specimen
6.1 Cut a minimum of three 51 by 229 mm [2 by 9 in.] or
3. Summary of Test Method
larger specimens. Specimens may be Test Method D4977/
3.1 Asample of mineral-surfaced roofing material is exam-
D4977M abrasion test samples.
ined under a magnifying lens and the area left unprotected by
6.2 Care should be taken so that granules do not transfer
granule cover is determined using a transparency overlay with
from one specimen to another.
grid lines.
7. Preparation of Apparatus
ThistestmethodisunderthejurisdictionofASTMCommitteeD08onRoofing
7.1 Place the specimen to be examined on a flat surface and
andWaterproofingandisthedirectresponsibilityofSubcommitteeD08.04onFelts,
Fabrics and Bituminous Sheet Materials.
arrangethelightsourceandmagnifiersothatthesamplecanbe
Current edition approved May 1, 2020. Published May 2020. Originally
plainly viewed.
approved in 1998. Last previous edition approved in 2012 as D6225/D6225M–98
(2012). DOI: 10.1520/D6225_D6225M-98R20.
7.2 Abr
...