ASTM_F_806_-_99a_2009.pdf

Designation:F80699a(Reapproved 2009)Standard Test Method forCompressibility and Recovery of Laminated CompositeGasket Materials1This standard is issued under the fixed designation F806;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 test method covers determination of the short-timecompressibility and recovery at room temperature of laminatedcomposite gasket materials.1.2 This test method is not intended as a test for compress-ibility under prolonged stress application,that is“creep,”or forrecovery following such prolonged stress application,theinverse of which is generally referred to as“compression set.”Also,it is only intended for tests at room temperature.1.3 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.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:2F104 Classification System for Nonmetallic Gasket Materi-als2.2 ASTM Adjuncts:Testing Machine Drawings33.Significance and Use3.1 This test method is designed to compare related lami-nated composite gasket materials under controlled conditionsand their short-time compressibility and recovery at roomtemperature.It measures compressibility with a matched pairof opposing upper and lower penetrators which provide betterprecision and bias than methods using an upper penetrator anda lower anvil.It is difficult to prepare undistorted test speci-mens from laminated composite gasket materials which willlay flat on an anvil.Also,with many composites having rigidinner layers the load on the upper penetrator is distributed overthe bottom anvil area resulting in a lower than actual com-pressibility reading.This test method may be used as a routinetest method when agreed upon between the purchaser and theproducer.4.Apparatus4.1 The testing machine4shall consist of the followingcomponents.4.1.1 PenetratorsA matched pair of opposing steel cylin-ders(within 6 0.025 mm(0.001 in.)specified for the type ofmaterial being tested,with the cylinder ends hardened andground.Penetrator diameters for various types of laminatedcomposite gasket materials are shown in Table 1.4.1.2 DialAn indicating dial,or dials,graduated in 0.025mm(0.001 in.)to show the thickness of the specimen duringthe test.Readings shall be estimated to the nearest 0.0025 mm(0.0001 in.).4.1.3 Preload,shall include the weight of the penetratoritself and added weights to give the value specified within 61%.A 22.2-N(5-lbf)preload shall be used.4.1.4 Loading DeviceA device for applying a specifiedmajor load to the upper end of the penetrator,which mayconsist of an arrangement of dead weights,a hydraulic cylin-der,an air cylinder,or any other device capable of applying themajor load at a slow uniform rate and to an accuracy of 6 1%.The major load shall be in addition to the specified preload.Major loads for various types of laminated composite gasketmaterials are shown in Table 1.5.Test Specimen5.1 The test specimen may be either circular or rectangularin shape.The minimum size shall be 12.7 mm(0.5 in.)largerthan the penetrator diameter being used,and the maximum size1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical TestMethods.Current edition approved Oct.1,2009.Published March 2010.Originallyapproved in 1983.Last previous edition approved in 2003 as F806 99a(2003)1.DOI:10.1520/F0806-99AR09.2For 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.3Available from ASTM International Headquarters.Order Adjunct No.ADJF0806.Original adjunct produced in 1983.4Alist of recommended suppliers,by Subcommittee F03.20,is available throughASTM.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 shall be 38.1 mm(1.5 in.)larger than it.The thickness shall bethat of the laminated composite gasket.Take care that thespecimen is flat,especially around the planned contact point ofthe opposing penetrators.6.Conditioning6.1 When all nonmetallic layers of the laminated compositeare the same type,condition in accordance with that type asshown in Table 1.6.2 When the nonmetallic layers of the laminated compositeare of different types,the specimen shall be conditioned for 22h in a controlled-humidity room or in a