ASTM C217/C217M-22

Standard Test Methods for Weather Resistance of Slate

SIGNIFICANCE AND USE
5.1 This test method is useful in indicating the differences in weather resistance between various slates. For comparison of relative slate performance, Specification C406/C406M provides a classification that includes expected service life based on depth of softening. This test method provides one element in the comparison of slates.
SCOPE
1.1 These test methods cover two procedures for weather resistance of slate in all outdoor installations by determining the depth of softening after soaking in 1 % sulfuric acid solution by a shear/scratch tester (Test Method A) or by hand scraping (Test Method B).  
Note 1: These tests are based on the fact that slates containing calcium carbonate undergo a chemical weathering which produces gypsum and carbon dioxide. The swelling action that results causes disintegration of the slate. Oxidation of iron sulfides (such as pyrite) may also adversely affect weathering durability of a slate. The extent of such action on various slates in the test has been found to correlate with the durability of the materials in actual weathering.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-May-2022
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: C18 - Dimension Stone
• Drafting Committee: C18.01 - Test Methods

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C217/C217M − 22
Standard Test Methods for
1
Weather Resistance of Slate
This standard is issued under the fixed designation C217/C217M; 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* C406/C406M Specification for Roofing Slate
C1799 Guide to Dimension Stone Test Specimen Sampling
1.1 These test methods cover two procedures for weather
and Preparation
resistance of slate in all outdoor installations by determining
the depth of softening after soaking in 1 % sulfuric acid
3. Terminology
solution by a shear/scratch tester (Test Method A) or by hand
3.1 Definitions:
scraping (Test Method B).
3.1.1 For definitions of terms used in these test methods,
NOTE1—Thesetestsarebasedonthefactthatslatescontainingcalcium
refer to Terminology C119.
carbonate undergo a chemical weathering which produces gypsum and
carbon dioxide. The swelling action that results causes disintegration of
4. Summary of Test Method
the slate. Oxidation of iron sulfides (such as pyrite) may also adversely
affectweatheringdurabilityofaslate.Theextentofsuchactiononvarious
4.1 After grinding the faces of the test specimens smooth
slates in the test has been found to correlate with the durability of the
and finishing with No. 80 abrasive, the specimen is sheared or
materials in actual weathering.
scraped in a controlled manner and the thickness of the
1.2 The values stated in either SI units or inch-pound units
specimen measured. The specimen is then submerged ina1%
are to be regarded separately as standard. The values stated in
sulfuric acid solution which is replaced with a fresh solution
each system are not necessarily exact equivalents; therefore, to
each day, for a total of 7 days. At the end of 7 days, the
ensure conformance with the standard, each system shall be
specimenisremovedandwashed,andthendriedinanovenfor
used independently of the other, and values from the two
24 h. The opposite face of the specimen is then sheared or
systems shall not be combined.
scrapedandthethicknessofthespecimenmeasured.Thedepth
1.3 This standard does not purport to address all of the of softening is the depth of a groove made by the shearing tool
safety concerns, if any, associated with its use. It is the afteracidtreatmentminusthedepthbeforeacidtreatment(Test
responsibility of the user of this standard to establish appro- MethodA), or the depth of scrape made by the cutting edge of
priate safety, health, and environmental practices and deter-
a hand scraping tool after acid treatment minus the depth
mine the applicability of regulatory limitations prior to use. before acid treatment (Test Method B).
1.4 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.1 Thistestmethodisusefulinindicatingthedifferencesin
Development of International Standards, Guides and Recom-
weather resistance between various slates. For comparison of
mendations issued by the World Trade Organization Technical
relative slate performance, Specification C406/C406M pro-
Barriers to Trade (TBT) Committee.
vides a classification that includes expected service life based
on depth of softening. This test method provides one element
2. Referenced Documents
in the comparison of slates.
2
2.1 ASTM Standards:
6. Apparatus
C119 Terminology Relating to Dimension Stone
6.1 Test Method A only:
6.1.1 Shear/Scratch tester, (see Fig. 1) with the shearing
1
3
These test methods are under the jurisdiction of ASTM Committee C18 on
tool, Model S-20 , or its equivalent. The apparatus includes a
Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test
removable scale beam that is mounted on a pivotal shaft
Methods.
CurrenteditionapprovedJune1,2022.PublishedJuly2022.Originallyapproved
in 1948. Last previous edition approved in 2021 as C217/C217M–21. DOI:
3
10.1520/C0217_C0217M-22. The sole source of supply known to the committee at this time is Taber
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Industries, North Tonawanda, NY. If you are aware of alternative suppliers, please
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM provide this information toASTM International Headquarters. Your comments will
1
Standards volume information, refer to the standard’s Document Summary page on receive careful consideration at a m
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C217/C217M − 21 C217/C217M − 22
Standard Test Methods for
1
Weather Resistance of Slate
This standard is issued under the fixed designation C217/C217M; 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*
1.1 These test methods cover two procedures for weather resistance of slate in all outdoor installations by determining the depth
of softening after soaking in 1 % sulfuric acid solution by a shear/scratch tester (Test Method A) or by hand scraping (Test Method
B).
NOTE 1—These tests are based on the fact that slates containing calcium carbonate undergo a chemical weathering which produces gypsum and carbon
dioxide. The swelling action that results causes disintegration of the slate. Oxidation of iron sulfides (such as pyrite) may also adversely affect weathering
durability of a slate. The extent of such action on various slates in the test has been found to correlate with the durability of the materials in actual
weathering.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.3 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C119 Terminology Relating to Dimension Stone
C406/C406M Specification for Roofing Slate
C1799 Guide to Dimension Stone Test Specimen Sampling and Preparation
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in these test methods, refer to Terminology C119.
1
These test methods are under the jurisdiction of ASTM Committee C18 on Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test Methods.
Current edition approved Nov. 15, 2021June 1, 2022. Published December 2021July 2022. Originally approved in 1948. Last previous edition approved in 20202021 as
C217/C217M–20.–21. DOI: 10.1520/C0217_C0217M-21.10.1520/C0217_C0217M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C217/C217M − 22
4. Summary of Test Method
4.1 After grinding the faces of the test specimens smooth and finishing with No. 80 abrasive, the specimen is sheared or scraped
in a controlled manner and the thickness of the specimen measured. The specimen is then submerged in a 1 % sulfuric acid solution
which is replaced with a fresh solution each day, for a total of 7 days. At the end of 7 days, the specimen is removed and washed,
and then dried in an oven for 24 h. The opposite face of the specimen is then sheared or scraped and the thickness of the specimen
measured. The depth of softening is the depth of a groove made by the shearing tool after acid treatment minus the depth before
acid treatment (Test Method A), or the depth of scrape made by the cutting edge of a hand scraping tool after acid treatment minus
the depth before acid treatment (Test Method B).
5. Significance and Use
5.1 This test method is useful in indicating the differences in weather resistance between various slates. For comparison of relative
slate performance, Specification C406/C406M provides a classification that includes expected service life based on depth of
softening. This test method provi
...