ASTM_C_217_-_C_217M_-_15a.pdf

Designation:C217/C217M15aStandard Test Method forWeather Resistance of Slate1This standard is issued under the fixed designation C217/C217M;the number immediately following the designation indicates the yearof 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.Scope1.1 This test method covers two procedures for weatherresistance of slate in all outdoor installations by determiningthe depth of softening by shear/scratch tester or by handscraping.NOTE1The test is based on the fact that slates containing pyrite,calcite,and carbon undergo a chemical weathering which results in theconversion of the calcite particles to gypsum.The swelling action thatresults causes disintegration of the slate.The extent of this action onvarious slates in the test has been found to correlate with the durability ofthe materials in actual weathering.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C119 Terminology Relating to Dimension StoneC1799 Guide to Dimension Stone Test Specimen Samplingand Preparation3.Terminology3.1 DefinitionsAll definitions are in accordance with Ter-minology C119.4.Significance and Use4.1 This test method is useful in indicating the differences inweather resistance between various slates.This test methodalso provides one element in the comparison of slates.5.Apparatus5.1 Either one of the following shall be used:5.1.1 Shear/Scratch Tester,(see Fig.1)with the shearhardness tool,Model S-203,or its equivalent.The apparatusincludes a removable scale beam that is mounted on a pivotalshaft projecting from an adjustable gage block that can beraised or lowered,corresponding with the thickness of a testspecimen up to 0.5 in.12.7 mm.The scale beam is set at anangle of 70 referencing the shaft it pivots on.A calibratedweight and sliding weight are mounted on the scale beam toachieve the desired load.Operated by an on/off switch,themotorized turntable rotates counter clockwise at a constantspeed of 0.6 r/min.5.1.2 Hand Scraping ToolThe scraping tool shall be madeby grinding down the blade of a putty knife to a length of 3 in.75 mm and a width of34in.20 mm.The end of the bladeshall be ground to a plane surface perpendicular to the lengthof the tool to form a sharp edge with either side of the blade.These sharp edges will be referred to as the“cutting edges.”6.Sampling6.1 The samples shall be selected by the purchaser or hisauthorized representative so as to be truly representative of theconsignment under consideration.Six shingles of roofing fromeach carload or fraction thereof or similar quantities from otherkinds of slate shall constitute a sample.NOTE2Six shingles 10 in.250 mm or more in length and of anystandard width are sufficient for this test.NOTE3Refer to Guide C1799 for additional information on selecting,preparing,and conditioning test specimens.7.Test Specimens7.1 Prepare at least three specimens,each 2 by 4 in.50 by100 mm measured along the cleavage faces,for determining1This test method is under the jurisdiction of ASTM Committee C18 onDimension Stone and is the direct responsibility of Subcommittee C18.01 on TestMethods.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1948.Last previous edition approved in 2015 as C217/C217M15.DOI:10.1520/C0217_C0217M-15A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The sole source of supply known to the committee at this time is TaberIndustries,North Tonawanda,NY.If you are aware of alternative suppliers,pleaseprovide this information to ASTM International Headquarters.Your comments willreceive careful consideration at a meeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the depth of softening in a 1%solution of sulfuric acid.The 2by 4 in.50 by 100 mm faces shall be ground smooth andfinished with No.80 abrasive.Specimens cut from sheared orpunched slate shall have no saw cut nearer than 1 in.25 mmfrom the edges or nail holes.NOTE4While the minimum of three specimens is ac