ASTM_D_2527_-_83_2011.pdf

Designation:D252783(Reapproved 2011)Standard Specification forRubber SealsSplice Strength1This standard is issued under the fixed designation D2527;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.Scope1.1 This specification covers the strength and appearance ofthe splice in vulcanized rubber-seal material of any size,type,or cross-sectional shape.1.2 Many types and varieties of seals are used in services ofall degrees of severity.In some instances,hollow tubing isspliced and used as a seal.It is also possible to have seals ofirregular cross sections,or made of polymers which,due totheir nature,or not conducive to a high-strength splice,although they will perform satisfactorily in their intendedapplication.1.3 Seals are exposed in service to a wide variety of mediaat various temperatures.The effect of such media on the splicedarea must be considered.Details of the test procedures toevaluate the effect of the media shall be agreed upon by thepurchaser and seller as part of the purchase contract.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.2.Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTension3.Classification3.1 In order to provide for the various types of seals andrequirements,three classes of splices have been established:3.1.1 Class 1 covers splices in seals not having a solid crosssection but an irregular cross section,of a polymer notconducive to a high-strength splice,or for moderate servicerequirements.3.1.2 Class 2 covers splices in solid seals of a shape andcomposition conducive to high-strength splices.This classcovers applications requiring high-splice strength or servicerequirements.3.1.3 Class 3 covers splices in round solid seals of acomposition conducive to extra-high-strength splices.Thisclass covers applications requiring extra-high-splice tensile andbend strength due to difficult service requirements.Class 3tests of seals in other than round shapes shall be agreed uponby the purchaser and manufacturer using this specification as aguide.3.2 In the event that an application requires special consid-eration and values,these values can be indicated on the partprint,using this specification as a guide.4.Workmanship4.1 Upon visual inspection,the splice shall not show anysigns of separation.5.Physical Requirements5.1 When tested in accordance with the procedure outlinedin Section 7,the splice shall meet the following requirements:Class 1Class 2Class 3AUltimate elongation for the sealarea,%2050100AIn qualitative nondestructive test,Class 3 seals shall also meet the requirementsin 7.2.3 and 7.2.4.6.Significance and Use6.1 These tests are used quantitatively,for evaluation,ap-proval,and as a referee method.Also these tests are usedqualitatively for quality control purposes.7.Test Methods7.1 Quantitative Destructive Test:7.1.1 The method described herein is for a quantitative-typedestructive test to be used for relative evaluation,approval,andas a referee method in the event of a dispute.7.1.2 When the dimensions of the seal permit it,prepareelongation specimens in accordance with Test Methods D4121This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics,RubberThreads and Seals.Current edition approved Nov.1,2011.Published January 2012.Originallyapproved in 1966.Last previous edition approved in 2006 as D2527 83(2006).DOI:10.1520/D2527-83R11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 in such a manner that the splice area shall fall within the testarea(Dimension L of Fig.2,Test Methods D412).When abias-cut splice is made,cut the elongation specimen from theseal in such a manner that the“line of splice”shall run straightacross the test specimen and perpendicular to the edges of thewidth of the test specimen(Dimension L of Fig.2,TestMethods D412).7.1.3 In the event that the seal cross section is too small toprepare a suitable standard specimen,employ the same methodnormally used to establish the ultimate tensile and elongationof the seal to establish the elongati