1、Designation:D799915(Reapproved 2019)Standard Classification forRubber Products in Natural Gas Pipeline Applications1This standard is issued under the fixed designation D7999;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 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 classification system covers the properties of vul-canized rubber materials(natural rubber,reclaimed rubber,synthetic
3、 robbers,alone or in combination)that are intendedfor use in rubber products found in natural gas pipelineapplications(for example,elastomeric couplings,o-rings,quadseals,and diaphragms).1.2 This classification system is based on the premise thatthe material properties of all rubber products can be
4、arrangedinto characteristic material designations.These designationsare determined by types and classes as described in Classifi-cation System D2000.For gas industry pipeline applications,materials can be further described using additional require-ments herein in conjunction with Classification Syst
5、em D2000.It must be noted that there are other types of elastomerscovered in Classification System D2000 that are not covered bythis standard.1.3 In all cases where the provisions of this classificationsystem would conflict with those of the detailed specificationsfor a particular product,the latter
6、 shall take precedence.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limita
7、tions prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization Te
8、chnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D297 Test Methods for Rubber ProductsChemical Analy-sisD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD1418 PracticeforRubberandRubberLaticesNomenclatureD1566
9、Terminology Relating to RubberD2000 Classification System for Rubber Products in Auto-motive ApplicationsD6370 Test Method for RubberCompositional Analysisby Thermogravimetry(TGA)D8015 Test Method for Dimensional Changes of Elastomerand Rubber Materials Due to Exposure to Gaseous Hy-drocarbon Enviro
10、nments3.Terminology3.1 DefinitionsFor definitions of technical terms pertain-ing to rubber used in this specification,see TerminologyD1566.3.2 DefinitionsThe nomenclature and abbreviations usedfor natural and synthetic rubbers are in accordance withPractice D1418.4.Purpose4.1 The purpose of this cla
11、ssification system is to provideguidance to the engineer in the selection of practical,commer-cially available rubber materials,and further to provide amethod for specifying these materials by the use of a simple“line call-out”designation.4.2 This classification system was developed to permit theadd
12、ition of descriptive values for future rubber materials1This classification is under the jurisdiction of ASTM Committee D11 onRubber and Rubber-like Materials and is the direct responsibility of SubcommitteeD11.30 on Classification of Rubber Compounds.Current edition approved Nov.1,2019.Published De
13、cember 2019.Originallyapproved in 2015.Last previous edition approved in 2015 as D7999 15.DOI:10.1520/D7999-15R19.2For 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 sta
14、ndards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decisio
15、n on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.without complete reorganization of classification system and tofacilitate the incorporation of future new test methods to keeppace
16、 with changing industry requirements.5.Classification5.1 Rubber materials shall be specified using the conventionset forth in Classification System D2000 with additional rubberproperties represented by supplemental suffix designations ZGnas described in Table 1.6.Basic Requirements6.1 The basic requirements for the properties specified inthis standard are based on values obtained from standardlaboratory test specimens prepared and tested in accordancewith the applicable ASTM test methods.Test re
