1、Designation: C782 13Standard 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 parent
2、heses 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.NOTE 1Cone penetration methods applicable to g
3、reases and 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) i
4、n degrees Fahrenheit.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 heal
5、th practices and determine 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 Me
6、thod for Cone Penetration 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for Needle Penetration of PetroleumWaxesD2451 Test Method for Degree of Set for Glazing Com-pounds on Metal Sash (Withdrawn 2002)3E2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.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 Def
7、initionsThe definition 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 f
8、or 5 s. The penetrationof 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
9、 procedure measures thesoftness 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 de
10、scribed in Test Method D5,with a certified needle.NOTE 2Test 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 th
11、e penetrometer.6.3 Thermometer, to measure 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 therequirements prescribed in Specification E2251 isrecommended, such as ASTM Saybolt Viscosity Thermometer17C (o
12、r 17F) having a range from 19 to 27C (66 to 80F).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 specim
13、en.1This test method is under the jurisdiction ofASTM 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 200
14、9 as C782 03(2009). DOI:10.1520/C0782-13.2For 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.3The last approved v
15、ersion of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Test Specimen8.1 Prepare a test specimen by cutting short lengths ofpreformed tape sealant and plying them together to
16、form a solidblock no smaller than 13 mm wide by 13 mm by 25 mm long.9. Conditioning9.1 Condition the test specimen and the penetrometer,including the needle, for at least2hat236 2C (73 6 3.6F).NOTE 3Other test temperatures may be used, provided that thespecimen and the penetrometer, including the ne
17、edle, are conditioned forat least2hatsuch 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 with the shaftset up so that there i
18、s a total moving load of 100 g. This loadis comprised of the 2.5-g needle, the 47.5-g shaft, and an extraweight of 50 g placed atop the shaft.10.2 Raise the penetrometer shaft until the pointer on thedial reads exactly zero. Lightly tap the indicator dial controllever to ensure that this reading is
19、maintained.10.3 Position the test specimen on the penetrometer so thatit is approximately centered under the needle. Then lower thatpart of the apparatus consisting of the dial gage and shaft withthe needle point until the needle point just makes contact withthe top surface of the specimen.NOTE 4If
20、the specimen is made from preformed tape sealant less than13 mm wide, care should be taken to see that the needle is not placed inthe joint between two abutting strips of preformed tape sealant.10.4 Quickly release the needle for 5 s.10.5 Adjust the apparatus to measure the distance throughwhich the
21、 needle penetrated the specimen. Record the amountof penetration to the nearest 0.1 mm.10.6 Wipe the penetrometer needle clean. Following thesame procedure, take at least two additional penetration read-ings for the same preformed tape sealant specimen. If readingsare taken on the same specimen surf
22、ace, the penetration shouldbe made at points at least 7 mm from other readings. Theamount of penetration for each reading should be recordedseparately and the needle should be wiped clean after eachreading.NOTE 5Unusually low readings, caused by the needle striking anembedded core or other hard mate
23、rial, and unusually high readings causedby penetrating a void or air pocket shall be considered invalid anddisregarded.11. Report11.1 Report the following information:11.1.1 Identification of the preformed tape sealant, that is,the name, lot number, and any other identifying characteristics.11.1.2 A
24、ctual temperature of the test specimen and appara-tus at the time of the test.11.1.3 At least three valid penetration readings and theiraverage.12. Precision and Bias12.1 Interlaboratory round-robin testing of the preformedtape sealant softness has determined the 2 or 95 % confidencelevel of precisi
25、on for the needle penetrometer test of preformedtape sealant softness at 23 6 0.5C (73 6 1F).12.2 The single-operator-penetrometer-day precision is 0.3mm.12.3 The interlaboratory or multioperator precision is 1.0mm.NOTE 6The single-operator and interlaboratory precision statementsfor needle penetrom
26、eter testing of preformed tape sealant softness at 23C(73F) have been found to hold for tests run at lower tape temperatures,for example, 17.8C (0F). At elevated test temperatures, for example,70C (158F) penetrometer readings and interlaboratory agreement issomewhat less precise.ASTM International t
27、akes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own
28、responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addr
29、essed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at
30、the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C782 132
