1、Designation: C 972 00 (Reapproved 2006)Standard Test Method forCompression-Recovery of Tape Sealant1This standard is issued under the fixed designation C 972; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses 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 compression-recovery characteristics of tape seal-ant.1.2 The va
3、lues 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
4、safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1There are no ISO standards similar or equivalent to thisASTM standard.2. Referenced Documents2.1 ASTM Standards:2C 717 Terminology of Building Seals and Sealants3. Terminology3.1 DefinitionsFor
5、definitions of terms used in this testmethod, refer to Terminology C 717.4. Significance and Use4.1 Tape sealants are tacky, deformable solids used undercompression between two or more surfaces of similar ordissimilar materials in a variety of sealing applications. Thisprocedure presents an indicati
6、on of the compression recoverycharacteristics of preformed tapes.5. Apparatus5.1 Glass Plates, two, each 6.35 by 76.2 by 76.2 mm (0.25by 3 by 3 in.).5.2 Steel Panels, two, cold-rolled, each 0.762 by 76.2 by76.2 mm (0.03 by 3 by 3 in.).NOTE 2Substitutes such as aluminum, acrylic, acrylonitrile-butadi
7、ene-styrene (ABS), may be substituted for the plates (5.1) andpanels (5.2).5.3 Compression Testing Machine, with a cross-head speedof 50 mm (2 in.)/min and capable of stopping at specifiedsettings.NOTE 3Load values may differ when determined on screw-typeversus spring-type test machines due to a dri
8、ft past the desired stop in thespring-type machine. It may be necessary to use shims to obtain thedesired stop.5.4 Recorder, for recording compression loads in newtons(or pounds-force).5.5 Stop Watch, measuring in minutes and seconds.5.6 Gage or Rule, capable of measuring tape thickness to0.025 mm o
9、r 0.001 in.6. Test Specimen and Sample6.1 Conditioning:6.1.1 Condition the specimens for 24 h at 23 6 2C (73.4 63.6F) and 506 10 % relative humidity.6.1.2 Other conditioning parameters may be included asdesired.6.2 Samples to be tested shall be taken from a roll or tapesealant after first removing a
10、nd discarding approximately thefirst 0.6 m (2 ft) of the roll.6.3 Tape sealant configuration should be approximately 9.53by 9.53 by 76.2 mm (0.375 by 0.375 by 3 in.). The sampleshould be re-extruded rather than plied to conform to thespecified size if the sample does not approximate thesedimensions.
11、6.4 Total tape volume (V) should be calculated (width bylength by thickness) for determination of tape sealant compres-sion index.6.5 Prepare two test specimens for each sample as follows:6.5.1 Do not clean or unnecessarily handle the surfaces ofsurface-treated or painted plate or panels.6.5.2 Clean
12、 plates or panels with detergent or solvent, orboth.6.5.3 Place two 76.2 by 9.53 by 9.53-mm (3 by 0.375 by0.375-in.) lengths of tape sealant on one of the plates or panels,as shown in Fig. 1, and remove the release paper. Place thesecond plate or panel over the tape sealant to complete the testspeci
13、men in accordance with Fig. 1.1This 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 edition approved May 1, 2006. Published May 2006. Originallyapproved in 1982. Last previ
14、ous edition approved in 2000 as C 972 00.2For 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.1Copyright ASTM Inte
15、rnational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Procedure7.1 Place the specimen in a laboratory press or equivalentequipment, and compress the specimen at 51 mm (2 in.)/minuntil the sealant tape thickness is 5.1 mm (0.20 in.). Maintainthe compression
16、 mode for exactly 1 min, recording maximumcompressive load in newtons or pounds force. At the end of 1min, raise the press crosshead and remove the specimen, takingcare not to disturb the specimen.7.2 After removing the specimen from the press, measureand record the tape sealant thickness after 5 mi
17、n and after2h.8. Calculations8.1 Calculate the compression load and recovery height foreach specimen as follows:R15 T12 5.1 mm 0.200 in.! (1)where:R1= free recovery height after 5 min, andT1= tape thickness after 5 min.R25 T22 5.1 mm 0.200 in.! (2)where:R2= free recovery height after 2 h, andT2= tap
18、e thickness after 2 h.Pc5 P/V (3)where:Pc= tape compression index, N/mm3(lbf/in.3),P = maximum compression load, N (lbf), andV = total tape sealant volume, mm3(in.3).9. Report9.1 The report shall include the following:9.1.1 Average recovery height after 5 min and after2htothe nearest 5.1 mm (0.001 i
19、n.),9.1.2 Average tape sealant compression index in newtonsper cubic millimetre (or pounds-force per cubic inch), and9.1.3 Type of compression equipment used.10. Precision and Bias310.1 Three laboratories were used in the force to compresstesting and four laboratories were used for both recovery tes
20、ts(5 min and 2 h).10.2 Repeatability I(r)The repeatability interval (within agiven laboratory) for four materials tested by three (or four)laboratories is listed in Table 1 for each of the calculated valuesdefined in Section 8.10.3 Reproducibility I(R)The reproducibility interval (be-tween given lab
21、oratories) for four materials tested by three (or3Supporting data are available from ASTM Headquarters. Request RR: C24-1008.FIG. 1 Compression Recovery Test SampleTABLE 1 Indexes of PrecisionSource of Variability Symbol Force to Compress, N (lbf) Recovery, 5 min, mm (in.) Recovery, 2 h, mm (in.)Rep
22、eatability (within laboratory) I(r) 50.5 (11.34) 0.43 (0.017) 0.30 (0.012)Reproducibility (between laboratories) I(R) 443.0 (99.56) 0.76 (0.030) 0.76 (0.030)C 972 00 (2006)2four) laboratories is listed in Table 1 for each of the calculatedvalues defined in Section 8.11. Keywords11.1 compression; rec
23、overy; tape sealantASTM 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 patent rights, and the riskof infringement
24、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 withdrawn. Your comments are invited either for revision of this standard or for
25、 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 comments have not received a fair hearing you shouldmake your views known
26、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).C 972 00 (2006)3
