1、Designation: C782 13 (Reapproved 2018)Standard 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.
2、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 describes a laboratory procedure fordetermining the softness of preformed tape sealants.NOTE 1Cone penetration metho
3、ds applicable to greases 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 (
4、in parenthe-ses) in 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-pria
5、te safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopm
6、ent of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsD5 Test Method for Penetration of Bituminous MaterialsD217 Test Meth
7、ods for Cone Penetration of LubricatingGreaseD937 Test Method 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for Needle Penetration of PetroleumWaxesD2451 Test Method for Degree of Set for Glazing Com-pounds on Metal Sash (Withdrawn 2002)3E2251 Specification for Liquid-in-Glass ASTM Thermom-ete
8、rs with Low-Hazard Precision Liquids3. Terminology3.1 DefinitionsThe 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 standa
9、rd needle under adefined load is placed on the specimen for 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
10、 two substrates in avariety of sealing applications. This 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 preforme
11、d tape sealant.6. Apparatus6.1 Needle Penetrometer, as described 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
12、 needle isused.6.2 Stop Watch or Timing Mechanism, for the 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 isreco
13、mmended, such as ASTM Saybolt Viscosity Thermometer17C (or 17F) having a range from 19 to 27C (66 to 80F).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 appro
14、ved Jan. 1, 2018. Published January 2018. Originallyapproved in 1986. Last previous edition approved in 2013 as C782 03(2013). DOI:10.1520/C0782-13R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
15、dards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version 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 StatesThis internat
16、ional standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Commit
17、tee.17. 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.8. Test Specimen8.1 Prepare a test specim
18、en 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 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 temperatu
19、res may be used, provided that thespecimen and the penetrometer, including the needle, 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.
20、1 Place the penetrometer in a level position with the shaftset up so that there is 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
21、zero. Lightly tap the indicator dial controllever to ensure that this reading is 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
22、the needle point just makes contact withthe top surface of the specimen.NOTE 4If 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
23、needle for 5 s.10.5 Adjust the apparatus to measure the distance throughwhich the 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 sam
24、e preformed tape sealant specimen. If readingsare taken on the same specimen surface, 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 5Unusual
25、ly low readings, caused by the needle striking anembedded core or other hard material, 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,
26、 that is,the name, lot number, and any other identifying characteristics.11.1.2 Actual 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 prefo
27、rmedtape sealant softness has determined the 2 or 95 % confidencelevel of precision 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
28、 6The single-operator and interlaboratory precision statementsfor needle penetrometer 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 re
29、adings and interlaboratory agreement issomewhat less precise.ASTM International takes 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 p
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32、r hearing you shouldmake your views known to the ASTM Committee on Standards, at 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 sta
33、ndard 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 13 (2018)2
