ASTM D6225-98e1

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Designation: D 6225 – 98
Standard Test Method for
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Granule Cover of Mineral Surfaced Roofing
This standard is issued under the fixed designation D 6225; 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 (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Editorially switched to SI dominant in August 2004.
1. Scope to both “as manufactured” material and material that has
weathered or undergone other types of exposure.
1.1 This test method covers the determination of the hiding
power of granules on a mineral surfaced roofing sheet.The test
5. Apparatus
is used primarily after an abrasion test has been conducted, to
5.1 Magnifier—An optical magnifier with a fixed power of
determine the portion of asphaltic compound that has been
magnification of 83 and a working field of at least 806
exposed as a result of the abrasion test.
2 2
mm (1.25 in. ).
1.2 The values stated in SI units are regarded as the
5.2 Transparency Overlay Grid—A transparency overlay
standard. The inch-pound units given in parentheses are for
with grid markings. The transparency must be of sufficient size
information only.
to cover the area abraded by the abrasion test brush described
1.3 This standard does not purport to address all of the
in Test Method D 4977, 32 by 159 mm (1.25 by 6.25 in.) with
safety concerns, if any, associated with its use. It is the
grid lines oriented to form squares 1.27 mm (0.05 in.) on a side
responsibility of the user of this standard to establish appro-
with 2160 squares/32 by 159 mm (1.25 in. by 6.25 in.). The
priate safety and health practices and determine the applica-
grid transparency must be capable of being positioned over the
bility of regulatory limitations prior to use.
sampleandmustpermittheoperatortoclearlyviewthesample
2. Referenced Documents and should be partitioned into groups of squares to facilitate
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counting (see Fig. 1).
2.1 ASTM Standards:
5.3 Light Source—Ahigh intensity lamp or fluorescent ring
D 4977 Test Method for Granule Adhesion to Mineral
light, capable of providing sufficient illumination of the min-
Surfaced Roofing by Abrasion
eral surfaced sample to be examined.
3. Summary of Test Method
6. Test Specimen
3.1 A sample of mineral surfaced roofing material is exam-
6.1 Cut a minimum of three 51 by 229 mm (2 by 9 in.) or
ined under a magnifying lens and the area left unprotected by
larger specimens. Specimens may be Test Method D 4977
granule cover is determined using a transparency overlay with
abrasion test samples.
grid lines.
6.2 Care should be taken so that granules do not transfer
4. Significance and Use from one specimen to another.
4.1 This test method is used to determine the extent of
7. Preparation of Apparatus
coverage of the granular surfacing over the asphaltic coating in
7.1 Place the specimen to be examined on a flat surface and
a sample of mineral surfaced roofing. The results determine
arrangethelightsourceandmagnifiersothatthesamplecanbe
compliance with the applicable specification requirements or
plainly viewed.
may be used for comparative analysis.This test method applies
7.2 Abrasion test 51 by 229 mm (2 by 9 in.) specimens can
be examined by removing the clamping tray from the abrasion
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This test method is under the jurisdiction of ASTM Committee D08 on
test machine and clamping the overlay grid directly over the
Roofing,Waterproofing, and Bituminous Materials and is the direct responsibility of
specimen (see Fig. 2).
Subcommittee D08.04 on Felts and Fabrics.
Current edition approved Jan. 10, 1998. Published March 1998.
8. Procedure
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
8.1 Remove any loose granules from the specimen with
Standards volume information, refer to the standard’s Document Summary page on
gentile tapping.
the ASTM website.
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D6225–98
8.2 Place the overlay grid so that it is in alignment with the
where:
area to be examined. In the case of abrasion test samples, the
A = total number of squares counted in 8.4, and
32 by 159 mm (1.25 in. by 6.25 in.) portion of the grid should
B = total number of squares in the 32 by 159 mm (1.25 by
be aligned with the abraded area of the sample. 6.25 in.) grid area (2160 total squares).
9.2 Average the specimen results for each sample to obtain
NOTE 1—If Test Method D 4977 abrasion test samples are being
evaluated, a felt tip marker can be used to scribe a line at the bottom edge the
...