ASTM C217-94(2004)
(Test Method)Standard Test Method for Weather Resistance of Slate
Standard Test Method for Weather Resistance of Slate
SIGNIFICANCE AND USE
This test method is useful in indicating the differences in weather resistance between various slates. This test method also provides one element in the comparison of slates.
SCOPE
1.1 This test method covers two procedures for weather resistance of slate in all outdoor installations by determining the depth of softening by an abraser or by hand scraping.
Note 1—The test is based on the fact that slates containing pyrite, calcite, and carbon undergo a chemical weathering which results in the conversion of the calcite particles to gypsum. The swelling action that results causes disintegration of the slate. The extent of this action on various slates in the test has been found to correlate with the durability of the materials in actual weathering.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:C217–94 (Reapproved 2004)
Standard Test Method for
Weather Resistance of Slate
This standard is issued under the fixed designation C 217; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 5.1.1 Shear/Scratch Tester, Taber Model 203 or 502, with
the shear hardness tool, Model S-20, or its equivalent.
1.1 This test method covers two procedures for weather
5.1.2 Hand Scraping Tool—The scraping tool shall be made
resistance of slate in all outdoor installations by determining
by grinding down the blade of a putty knife to a length of 3 in.
the depth of softening by an abraser or by hand scraping.
(76.2 mm) and a width of ⁄4 in. (19.05 mm). The end of the
NOTE 1—The test is based on the fact that slates containing pyrite,
blade shall be ground to a plane surface perpendicular to the
calcite, and carbon undergo a chemical weathering which results in the
length of the tool to form a sharp edge with either side of the
conversion of the calcite particles to gypsum. The swelling action that
blade. These sharp edges will be referred to as the “cutting
results causes disintegration of the slate. The extent of this action on
edges.”
various slates in the test has been found to correlate with the durability of
the materials in actual weathering.
6. Sampling
1.2 This standard does not purport to address all of the
6.1 The samples shall be selected by the purchaser or his
safety concerns, if any, associated with its use. It is the
authorized representative so as to be truly representative of the
responsibility of the user of this standard to establish appro-
consignment under consideration. Six shingles of roofing from
priate safety and health practices and determine the applica-
each carload or fraction thereof or similar quantities from other
bility of regulatory limitations prior to use.
kinds of slate shall constitute a sample.
2. Referenced Documents
NOTE 2—Six shingles 10 in. (254 mm) or more in length and of any
standard width are sufficient for this test and also for modulus of rupture
2.1 ASTM Standards:
and absorption tests.
C 119 Terminology Relating to Dimension Stone
7. Test Specimens
3. Terminology
7.1 Prepareatleastthreespecimens,each2by4in.(50.8by
3.1 Definitions—All definitions are in accordance with Ter-
101.6 mm) measured along the cleavage faces, for determining
minology C 119.
the depth of softening in a 1 % solution of sulfuric acid. The 2
4. Significance and Use
by 4-in. faces shall be ground smooth and finished with No. 80
abrasive. Specimens cut from sheared or punched slate shall
4.1 Thistestmethodisusefulinindicatingthedifferencesin
have no saw cut nearer than 1 in. (25.4 mm) from the edges or
weather resistance between various slates. This test method
nail holes.
also provides one element in the comparison of slates.
8. Procedure with Shear/Scratch Tester
5. Apparatus
8.1 In this procedure determine the depth of softening in
5.1 Either one of the following shall be used:
acid with the shear/scratch tester (described in 5.1.1). The test
involves measuring the depth of a groove made by the shearing
This test method is under the jurisdiction of ASTM Committee C18 on
tool in fresh specimens and also in the same specimens after
Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test
soaking 7 days in 1 % sulfuric acid.
Methods.
8.2 Draw with a pencil compass, on at least three of the 2 by
Current edition approved Oct. 1, 2004. Published November 2004. Originally
4-in. (50.8 by 101.6-mm) specimens, an arc of a circle of the
published in 1948 as C 217 – 48 T. Last previous edition approved in 1999 as
C 217 – 94 (1999).
same radius as that made by the shearing tool. Mark each arc
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
Standards volume information, refer to the standard’s Document Summary page on Described in the 1962 Bulletin 62203–502 of the Taber Instrument Co., North
the ASTM website. Tonawanda, NY.
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C217–94 (2004)
at four points for thickness measurements, as indicated in Fig. specimen at an angle of approximately 30°. Move the cutting
1. Measure the thickness at each point to the nearest 0.0001 in. edge forward about 1 ⁄2 in. (38.1 mm) for each stroke, and let
(0.0025 mm). With a 2.2-lbf (9.8-N) load on the shearing tool, each stroke follow the same path. Make eight strokes with one
groove each specimen along the penciled arc by rotating the cutting edge and eight with the other. Before each specimen is
turntable slowly and steadily by hand in a counter clockwise
scraped, sharpen the cutting edge.
direction. Then repeat the thickness measurements at the same
NOTE 4—In this test the pressure on the blade is estimated but not
four points to determine the depth of groove made by the
definitely controlled. The following guide in applying the proper pressure
shearing tool in fresh specimens.
is suggested: Grasp the handle of the
...
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