ASTM D6225-98(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D6225 – 98 (Reapproved 2004)
Standard Test Method for
Granule Cover of Mineral Surfaced Roofing
This standard is issued under the fixed designation D6225; 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 5. Apparatus
1.1 This test method covers the determination of the hiding 5.1 Magnifier—An optical magnifier with a fixed power of
power of granules on a mineral surfaced roofing sheet.The test magnification of 83 and a working field of at least 806
2 2
is used primarily after an abrasion test has been conducted, to mm (1.25 in. ).
determine the portion of asphaltic compound that has been 5.2 Transparency Overlay Grid—A transparency overlay
exposed as a result of the abrasion test. with grid markings. The transparency must be of sufficient size
1.2 The values stated in SI units are regarded as the to cover the area abraded by the abrasion test brush described
standard. The inch-pound units given in parentheses are for in Test Method D4977, 32 by 159 mm (1.25 by 6.25 in.) with
information only. grid lines oriented to form squares 1.27 mm (0.05 in.) on a side
1.3 This standard does not purport to address all of the with 2160 squares/32 by 159 mm (1.25 by 6.25 in.). The grid
safety concerns, if any, associated with its use. It is the transparency must be capable of being positioned over the
responsibility of the user of this standard to establish appro- sampleandmustpermittheoperatortoclearlyviewthesample
priate safety and health practices and determine the applica- and should be partitioned into groups of squares to facilitate
bility of regulatory limitations prior to use. 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 min-
2.1 ASTM Standards:
eral surfaced sample to be examined.
D4977 Test Method for Granule Adhesion to Mineral Sur-
6. Test Specimen
faced Roofing by Abrasion
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 A sample of mineral surfaced roofing material is exam- 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
4. Significance and Use
7.1 Place the specimen to be examined on a flat surface and
4.1 This test method is used to determine the extent of
arrangethelightsourceandmagnifiersothatthesamplecanbe
coverage of the granular surfacing over the asphaltic coating in plainly viewed.
a sample of mineral surfaced roofing. The results determine
7.2 Abrasion test 51 by 229 mm (2 by 9 in.) specimens can
compliance with the applicable specification requirements or be examined by removing the clamping tray from the abrasion
may be used for comparative analysis.This test method applies
test machine and clamping the overlay grid directly over the
to both “as manufactured” material and material that has specimen (see Fig. 2).
weathered or undergone other types of exposure.
8. Procedure
8.1 Remove any loose granules from the specimen with
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
gentle tapping.
and Waterproofing and is the direct responsibility of Subcommittee D08.04 on Felts
and Fabrics. 8.2 Place the overlay grid so that it is in alignment with the
Current edition approved Dec. 1, 2004. Published December 2004. Originally
area to be examined. In the case of abrasion test samples, the
´1
approved in 1998
...