ASTM_D_4226_-_11.pdf

Designation:D422611An American National StandardStandard Test Methods forImpact Resistance of Rigid Poly(Vinyl Chloride)(PVC)Building Products1This standard is issued under the fixed designation D4226;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the determination of theenergy required to crack or break rigid poly(vinyl chloride)(PVC)plastic sheeting and profile flat sections used in buildingproducts,as well as extruded or molded test samples,underspecified conditions of impact from a freefalling standardweight striking an impactor with either of two configurations incontact with the specimen.1.2 Two test procedures are included:1.2.1 Procedure A,used to determine minimum impactenergy required to cause failure(hole,crack,split,shatter,ortear).1.2.2 Procedure B,used to determine minimum impactenergy required to cause brittle failure.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.NOTE1There is no known ISO equivalent to this standard.1.4 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding,those in tables in figures)shall not be considered asrequirements of this standard.1.5 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.Specific precau-tionary statements are given in Section 8.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD3679 Specification for Rigid Poly(Vinyl Chloride)(PVC)SidingD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE178 Practice for Dealing With Outlying Observations3.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D883,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 failure(of test specimen,as related to impactresistance)signified by the presence of a punched hole,crack,split,shatter,or tear that was created in the target area bythe impact of the falling weight(see Fig.1).3.2.2 ductile failure(ductile break,as related to impactresistance)a tear or split having an angle greater than 0 atthe tip and extending through the entire thickness of thespecimen such that light is directly visible through the tear orsplit(see Fig.1).3.2.3 brittle failure(brittle break,as related to impactresistance)a punched hole,split,or shatter where a piece ofthe specimen separates from the main part of the specimen ora crack that has a 0 angle at the tip as viewed by the naked eye(see Fig.1).3.2.4 mean failure height(Procedure A)the height fromwhich the falling weight will cause 50%of the specimens tofail.1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Subcommittee D20.24 on PlasticBuilding Products.Current edition approved Sept.1,2011.Published September 2011.Originallyapproved in 1983.Last previous edition approved in 2010 as D4226-10.DOI:10.1520/D4226-11.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.5 mean failure energy(mean impact resistance),(Pro-cedure A)energy required to produce 50%failures;theproduct of the weight and mean failure height.3.2.6 normalized mean failure energy(normalized meanimpact resistance)the mean failure energy per unit(average)specimen thickness(Procedure A).3.2.7 mean brittle failure heightthe height from which thefalling weight will cause 50%brittle failures in specimens(Procedure B).3.2.8 mean brittle failure energy(mean energy of ductile-to-brittle transition),(Procedure B)energy required to pro-duce 50%brittle failures;the product of the weight and meanbrittle failure height.3.2.9 normalized mean brittle failure energy(normalizedmean energy of ductile-to-brittle transition),(Procedure B)the mean brittle failure energy per unit(average)specimenthickness.3.2.10 outlieran observation that appears to deviate mark-edly from other members of the sample in which it occurs.4.Summary of Test Method4.1 The building product profile is cut apart,if necessary,toob