ASTM_F_1315_-_00_2014.pdf

Designation:F131500(Reapproved 2014)Standard Test Method forDensity of a Sheet Gasket Material1This standard is issued under the fixed designation F1315;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 test method covers a procedure for determining thedensity of a gasket material.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodF104 Classification System for Nonmetallic Gasket Materi-als3.Summary of Test Method3.1 A die-cut specimen conditioned.Thickness,weight andarea are measured and the density is calculated and reported.4.Significance and Use4.1 Density is an important property of a gasket material,since it has an inverse relationship to the void volume of thematerial.Density is often used in a specification,since rela-tionships to sealability,compressibility,creep relaxation,andtensile strength can be found for a given gasket grade.4.2 Density is a measurement of the mass to the volumeratio and therefore easily determined with a weight scale andthickness measuring device.This test method requires from 1h to two days of sample conditioning,which is necessary toachieve a high level of precision,but which detracts from itsusefulness as a production test method.Where it must bemodified for manufacturing control,it is recommended thatthickness and weight measurement methods be adhered tostrictly.5.Interferences5.1 Moisture adds to the weight of most gasket specimens,and may cause the material to swell.Proper conditioning of thespecimen should control moisture as a variable.6.Apparatus6.1 ThicknessA thickness measurement device actuatedby a dead weight load as specified in Table 1.The presser footshall be 6.40 6 0.13 mm(0.252 6 0.005 in.)in diameter.Thedevice shall be capable of reading within 1%of the thicknessbeing measured.The anvil shall have a diameter not less thanthat of the presser foot.6.2 WeightAn analytical balance accurate to 61%of thespecimen weight.7.Specimen Conditioning7.1 Specimen shall be conditioned in accordance with theirclassification as specified in Classification System F104 priorto testing.8.Test Specimen8.1 Three specimens are to be measured.8.2 Specimen size and shape is left to the discretion of thetester.In no case,however,should the area of the specimen beless than 25 cm2(4 in.2).The area of the specimen shall bemeasured accurate to 61%.For this reason a die cut specimenis required.9.Procedure9.1 Remove the specimens one at a time from the condi-tioning chamber if not in a properly conditioned room,andweigh on the analytical balance,recording the weight.9.2 Measure area of specimen.9.3 Measure the thickness of the specimen using the propersize presser foot and dead weight as specified in Table 1.Thenumber of points to be measured will be dependent upon the1This 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 March 1,2014.Published April 2014.Originallyapproved in 1990.Last previous edition approved in 2006 as F1315 00(2006).DOI:10.1520/F1315-00R14.2For 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 specimen size and shape,but a minimum of five points must bemeasured and the average used.Record the thickness.10.Calculation10.1Densityg/cm3!5W 310T 3A(1)where:W=weight of specimen,g,T=thickness of specimen,mm,andA=area of specimen,cm2.11.Report11.1 Report the following information:11.1.1 Specimen label(for example,grade designation,batch number,etc.).11.1.2 Specimen thickness.11.1.3 Specimen area.11.1.4 Specimen weight.11.1.5 Manufacturing date,if known.11.1.6 Test date.11.1.7 Density in kg/m3(g/cm3).11.1.8 Testers identification.12.Precision and Bias12.1 PrecisionThe inherent variability for this test methodwas determined by an interlaboratory test program using fivematerials in 12 laboratories with five measurements per mate-rial.The data were analyzed using Practice E691 for statisticalinferences.Results are listed in Table 2.