ASTM C217-94(1999)
(Test Method)Standard Test Method for Weather Resistance of Slate
Standard Test Method for Weather Resistance of Slate
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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 217 – 94 (Reapproved 1999)
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 5.1.2 Hand Scraping Tool—The scraping tool shall be made
by grinding down the blade of a putty knife to a length of 3 in.
1.1 This test method covers two procedures for weather
(76.2 mm) and a width of ⁄4in. (19.05 mm). The end of the
resistance of slate in all outdoor installations by determining
blade shall be ground to a plane surface perpendicular to the
the depth of softening by an abraser or by hand scraping.
length of the tool to form a sharp edge with either side of the
NOTE 1—The test is based on the fact that slates containing pyrite,
blade. These sharp edges will be referred to as the “cutting
calcite, and carbon undergo a chemical weathering which results in the
edges.”
conversion of the calcite particles to gypsum. The swelling action that
results causes disintegration of the slate. The extent of this action on
6. Sampling
various slates in the test has been found to correlate with the durability of
6.1 The samples shall be selected by the purchaser or his
the materials in actual weathering.
authorized representative so as to be truly representative of the
1.2 This standard does not purport to address all of the
consignment under consideration. Six shingles of roofing from
safety concerns, if any, associated with its use. It is the
each carload or fraction thereof or similar quantities from other
responsibility of the user of this standard to establish appro-
kinds of slate shall constitute a sample.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 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. Referenced Documents
and absorption tests.
2.1 ASTM Standards:
7. Test Specimens
C 119 Terminology Relating to Dimension Stone
7.1 Prepare at least three specimens, each 2 by 4 in. (50.8 by
3. Terminology
101.6 mm) measured along the cleavage faces, for determining
the depth of softening in a 1 % solution of sulfuric acid. The 2
3.1 Definitions—All definitions are in accordance with Ter-
by 4-in. faces shall be ground smooth and finished with No. 80
minology C 119.
abrasive. Specimens cut from sheared or punched slate shall
4. Significance and Use
have no saw cut nearer than 1 in. (25.4 mm) from the edges or
nail holes.
4.1 This test method is useful in indicating the differences in
weather resistance between various slates. This test method
8. Procedure with Shear/Scratch Tester
also provides one element in the comparison of slates.
8.1 In this procedure determine the depth of softening in
5. Apparatus
acid with the shear/scratch tester (described in 5.1.1). The test
involves measuring the depth of a groove made by the shearing
5.1 Either one of the following shall be used:
tool in fresh specimens and also in the same specimens after
5.1.1 Shear/Scratch Tester, Taber Model 203 or 502, with
soaking 7 days in 1 % sulfuric acid.
the shear hardness tool, Model S-20, or its equivalent.
8.2 Draw with a pencil compass, on at least three of the 2 by
4-in. (50.8 by 101.6-mm) specimens, an arc of a circle of the
same radius as that made by the shearing tool. Mark each arc
This test method is under the jurisdiction of ASTM Committee C-18 on
at four points for thickness measurements, as indicated in Fig.
Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test
1. Measure the thickness at each point to the nearest 0.0001 in.
Methods.
Current edition approved Dec. 15, 1994. Published February 1995. Originally
(0.0025 mm). With a 2.2-lbf (9.8-N) load on the shearing tool,
published as C 217 – 48 T. Last previous edition C 217 – 85 (1990).
groove each specimen along the penciled arc by rotating the
Annual Book of ASTM Standards, Vol 04.07.
turntable slowly and steadily by hand in a counter clockwise
Described in the 1962 Bulletin 62203–502 of the Taber Instrument Co., North
Tonawanda, NY. direction. Then repeat the thickness measurements at the same
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 217
FIG. 1 Diagram of Slate Specimen Prepared for Test with Taber Shear/Scratch Tester
definitely controlled. The following guide in applying the proper pressure
four points to determine the depth of groove made by the
is suggested: Grasp the handle of the tool in the same way as in scraping
shearing tool in fresh specimens.
a specimen. Press a “cutting edge” on the weighing table of a small
8.3 Then put the specimens in a glass vessel and completely
platform scale when the weighing beam is loaded for 3 lbf (13 N). The
cover with 1 % sulfuric acid solution. Space the specimens in
pressure on the tool and also the amount of bending of the blade required
the container so that the ac
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.