1、Designation: C 782 03Standard Test Method forSoftness of Preformed Tape Sealants1This standard is issued under the fixed designation C 782; 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 pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 t
3、o greases and topetrolatum are described in Test Methods D 217 and D 937. Test MethodD 2451 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 as thestandard. The values given in parenthesis are for inform
4、ationonly.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 practice
5、s and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:C 717 Terminology of Building Seals and Sealants2D 5 Test Method for Penetration of Bituminous Materials3D 217 Test Method for Cone Penetration of LubricatingGrease4D 937 Test Method f
6、or Cone Penetration of Petrolatum3D 1321 Test Method for Needle Penetration of PetroleumWaxes4D 2451 Test Method for Degree of Set for Glazing Com-pounds on Metal Sash2E 1 Specification for ASTM Thermometers53. Terminology3.1 DefinitionsThe definition of the following term usedin this test method is
7、 found in Terminology C 717: 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 the needle into the preformed tape sealant i
8、s 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 thesoftness of a preformed tape sealant and gives
9、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 D 5,with a certified needle.NOTE 2Test Method D
10、 5 describes the needle method for determiningthe penetration of bituminous material; Test Method D 1321 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 measure the temperature of the t
11、estspecimen 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 E 1 is recommended,such as ASTM Saybolt Viscosity Thermometer 17C (or 17F)having a range from 19 to 27C (66 to 80F).7. Sampling7.1 Sampl
12、es to be tested shall be taken from a fresh roll ofpreformed tape sealant, after first removing and discardingapproximately the first 600 mm (2 ft) of the roll.7.2 Remove release paper as required in order to fashion asuitable test specimen.8. Test Specimen8.1 Prepare a test specimen by cutting shor
13、t lengths ofpreformed tape sealant and plying them together to form a solidblock no smaller than 13 mm (0.5 in) wide by 13 mm (0.5 in)by 25 mm (1.0 in) long.1This test method is under the jurisdiction of ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommitte
14、e C24.20 onGeneral Sealant Standards.Current editon approved May 10, 2003. Published June 2003. Originallyapproved in 1986. Last previous edition approved in 1999 as C 782 99.2Annual Book of ASTM Standards, Vol 04.07.3Annual Book of ASTM Standards, Vol 04.03.4Annual Book of ASTM Standards, Vol 05.01
15、.5Annual Book of ASTM Standards, Vol 14.03.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.9. Conditioning9.1 Condition the test specimen and the penetrometer,including the needle, for at least2hat236 2C (73 6 3.6F).NOTE 3Other test
16、temperatures 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. Pro
17、cedure10.1 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
18、 exactly 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 poi
19、nt until 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 (0.5 in.) wide, care should be taken to see that the needle is notplaced in the joint between two abutting strips of preformed tape sealant.10.4 Q
20、uickly release the 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 re
21、ad-ings for the same preformed tape sealant specimen. If readingsare taken on the same specimen surface, the penetration shouldbe made at points at least 7 mm (0.25 in.) from other readings.The amount of penetration for each reading should be recordedseparately and the needle should be wiped clean a
22、fter eachreading.NOTE 5Unusually 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
23、of the preformed tape sealant, 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 ro
24、und-robin testing of the preformedtape sealant softness has determined the 2s 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 multio
25、perator precision is 1.0mm.NOTE 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 exa
26、mple,70C (158F) penetrometer readings 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 determinatio
27、n of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own 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 withdra
28、wn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed 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 c
29、omments have not received a fair 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 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).C782032
