1、Designation:C78213Standard Test Method forSoftness of Preformed Tape Sealants1This standard is issued under the fixed designation C782;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
2、indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes a laboratory procedure fordetermining the softness of preformed tape sealants.NOTE1Cone penetration methods applicable to greases and
3、topetrolatum are described in Test Methods D217 and D937.Test MethodD2451 also uses a penetration technique for determining the degree of setin sash glazing compounds.1.2 The values stated in SI units are to be regarded asstandard.Temperature values are also provided(in parenthe-ses)in degrees Fahre
4、nheit.1.3 The subcommittee with jurisdiction is not aware of anysimilar ISO standard.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 d
5、etermine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsD5 Test Method for Penetration of Bituminous MaterialsD217 Test Methods for Cone Penetration of LubricatingGreaseD937 Test Method for Cone Penet
6、ration of PetrolatumD1321 Test Method for Needle Penetration of PetroleumWaxesD2451 Test Method for Degree of Set for Glazing Com-pounds on Metal Sash(Withdrawn 2002)3E2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 DefinitionsThe definitio
7、n of the following term usedin this test method is found in Terminology C717:preformedtape sealant.4.Summary of Test Method4.1 The preformed tape sealant specimen is allowed toequilibrate at standard conditions.A standard needle under adefined load is placed on the specimen for 5 s.The penetrationof
8、 the needle into the preformed tape sealant is measured.Multiple readings are recorded and averaged.5.Significance and Use5.1 Preformed tape sealants are tacky,deformable solidsthat are used under compression between two substrates in avariety of sealing applications.This procedure measures thesoftn
9、ess of a preformed tape sealant and gives an indication ofthe preformed tape sealants ease of compression duringinstallation.The resistance to penetration may also give anindication of the toughness of the preformed tape sealant.6.Apparatus6.1 Needle Penetrometer,as described in Test Method D5,with
10、a certified needle.NOTE2Test Method D5 describes the needle method for determiningthe penetration of bituminous material;Test Method D1321 describes asimilar method for use with petroleum waxes,but a different needle isused.6.2 Stop Watch or Timing Mechanism,for the penetrometer.6.3 Thermometer,to m
11、easure the temperature of the testspecimen in the vicinity of the temperature of the test.For testsat 23 6 0.5C(73 6 1F)a thermometer conforming to therequirementsprescribedinSpecificationE2251isrecommended,such as ASTM Saybolt Viscosity Thermometer17C(or 17F)having a range from 19 to 27C(66 to 80F)
12、.7.Sampling7.1 Samples to be tested shall be taken from a fresh roll ofpreformed tape sealant,after first removing and discardingapproximately the first 600 mm of the roll.7.2 Remove release paper as required in order to fashion asuitable test specimen.1This test method is under the jurisdiction ofA
13、STM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.20 onGeneral Test Methods.Current editon approved May 1,2013.Published June 2013.Originally approvedin 1986.Last previous edition approved in 2009 as C782 03(2009).DOI:10.1520/C0782-13.2For reference
14、d 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.3The last approved version of this historical standard is referenced onwww.astm.
15、org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Test Specimen8.1 Prepare a test specimen by cutting short lengths ofpreformed tape sealant and plying them together to form a solidblock no smaller than 13 mm wide by 13 mm by 25 mm lo
16、ng.9.Conditioning9.1 Condition the test specimen and the penetrometer,including the needle,for at least 2 h at 23 6 2C(73 6 3.6F).NOTE3Other test temperatures may be used,provided that thespecimen and the penetrometer,including the needle,are conditioned forat least 2 h at such temperature and maintained at that temperature duringthe test.For low temperature testing,for example,both conditioning andtesting must be done in a cold box.10.Procedure10.1 Place the penetrometer in a level position wit
