ASTM_F_868_-_02_2009.pdf

Designation:F86802(Reapproved 2009)Standard Classification forLaminated Composite Gasket Materials1This standard is issued under the fixed designation F868;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This classification covers a means for specifying ordescribing pertinent properties of commercial laminate com-posite gasket materials(LCGM).These structures are com-posed of two or more chemically different layers of material.These materials may be organic or inorganic,or combinationswith various binders or impregnants.Gasket coatings are notcovered since details thereof are intended to be given onengineering drawings,or as separate specifications.Commer-cial materials designated as enveloped gaskets are excludedfrom this classification;they are covered in Practice F336.1.2 Since all of the properties that contribute to gasketperformance are not included,use of this classification as abasis for selecting LCGM is limited.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel,Strip,Carbon(0.25Maximum Percent),Cold-RolledD2000 Classification System for Rubber Products in Auto-motive ApplicationsF104 Classification System for Nonmetallic Gasket Materi-alsF146 Test Methods for Fluid Resistance of Gasket MaterialsF336 Practice for Design and Construction of NonmetallicEnveloped Gaskets for Corrosive ServiceF433 Practice for Evaluating Thermal Conductivity of Gas-ket MaterialsF1276 Test Method for Creep Relaxation of LaminatedComposite Gasket Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 boardthe term board is used in the context of a thick(generally greater than 1.52 mm(0.060 in.)and rigid nonme-tallic material often purchased in sheet or strip form.3.1.2 composite gasket materiala gasket structure com-posed of two or more different materials joined together in flat,parallel layers.4.Significance and Use4.1 This classification is intended to encourage uniformityin reporting properties;to provide a common language forcommunications between producers and users;to guide engi-neers and designers in the use,construction,and properties ofcommercially available materials;and to be versatile enough tocover new materials and test methods as they are introduced.5.Basis of Classification5.1 This classification is based on the principle that LCGMshould be described,insofar as possible,in terms of use,composition,combining method,and specific physical andmechanical characteristics.Thus,users of gasket materials can,by selecting different combinations of materials and properties,define various parts.Suppliers,likewise,can report uses,composition,and properties of available products.6.Numbering System6.1 To permit line call-out of the description mentioned in5.1,this classification establishes letter or number symbols todescribe use,composition,and physical properties and perfor-mance levels of certain properties.6.2 In specifying or describing gasket materials,each linecall-out shall include the number of this system and a numberand letter series describing the use,composition,and combin-ing method plus suffix call-out,as shown in Table 1.6.3 To further specify or describe gasket materials,each linecall-out may include one or more suffix letter-numeralsymbols,as listed in Table 2.1This classification is under the jurisdiction of ASTM Committee F03 onGaskets and is the direct responsibility of Subcommittee F03.30 on Classification.Current edition approved May 1,2009.Published May 2009.Originallyapproved in 1984.Last previous edition approved in 2002 as F868 02.DOI:10.1520/F0868-02R09.2For 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 7.Physical and Mechanical Properties7.1 Gasket materials identified by this classification shallhave a number and letter call-out for end-use and constructionindicated in Table 1 and additional properties by a letter-numeral call-out shown in Table 2.8.Thickness Requirements8.1 Gasket materials identified by this classification shallconform to the thickness specified on the gasket drawing or onthe order.8.2 T