ASTM D6225-98

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 6225 – 98
Standard Test Method for
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.
1. Scope 5.2 Transparency Overlay Grid—A transparency overlay
with grid markings. The transparency must be of sufficient size
1.1 This test method covers the determination of the hiding
to cover the area abraded by the abrasion test brush described
power of granules on a mineral surfaced roofing sheet. The test
in Test Method D 4977, 1.125 by 6.25 in. (28.6 by 159 mm)
is used primarily after an abrasion test has been conducted, to
with grid lines oriented to form squares 0.05 in. (1.27 mm) on
determine the portion of asphaltic compound that has been
a side (2160 squares/1.125 in. by 6.25 in. (28.6 by 159 mm)).
exposed as a result of the abrasion test.
The grid transparency must be capable of being positioned over
1.2 The values stated in inch-pound units are regarded as the
the sample and must permit the operator to clearly view the
standard. The SI units given in parentheses are for information
sample and should be partitioned into groups of squares to
only.
facilitate counting (see Fig. 1).
1.3 This standard does not purport to address all of the
5.3 Light Source—A high intensity lamp or fluorescent ring
safety concerns, if any, associated with its use. It is the
light, capable of providing sufficient illumination of the min-
responsibility of the user of this standard to establish appro-
eral surfaced sample to be examined.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Specimen
2. Referenced Documents 6.1 Cut a minimum of three 2 by 9 in. (50.8 by 229 mm) or
larger specimens. Specimens may be Test Method D 4977
2.1 ASTM Standards:
abrasion test samples.
D 4977 Test Method for Granule Adhesion to Mineral
2 6.2 Care should be taken so that granules do not transfer
Surfaced Roofing by Abrasion
from one specimen to another.
3. Summary of Test Method
7. Preparation of Apparatus
3.1 A sample of mineral surfaced roofing material is exam-
7.1 Place the specimen to be examined on a flat surface and
ined under a magnifying lens and the area left unprotected by
arrange the light source and magnifier so that the sample can be
granule cover is determined using a transparency overlay with
plainly viewed.
grid lines.
7.2 Abrasion test 2 by 9 in. (50.8 by 229 mm) specimens
4. Significance and Use
can be examined by removing the clamping tray from the
abrasion test machine and clamping the overlay grid directly
4.1 This test method is used to determine the extent of
over the specimen (see Fig. 2).
coverage of the granular surfacing over the asphaltic coating in
a sample of mineral surfaced roofing. The results determine
8. Procedure
compliance with the applicable specification requirements or
8.1 Remove any loose granules from the specimen with
may be used for comparative analysis. This test method applies
gentile tapping.
to both “as manufactured” material and material that has
8.2 Place the overlay grid so that it is in alignment with the
weathered or undergone other types of exposure.
area to be examined. In the case of abrasion test samples, the
5. Apparatus 1.25 in. by 6.25 in. (28.6 by 159 mm) portion of the grid should
be aligned with the abraded area of the sample.
5.1 Magnifier—An optical magnifier with a fixed power of
magnific
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