1、Designation: C972 00 (Reapproved 2011)C972 18Standard Test Method forCompression-Recovery of Tape Sealant1This standard is issued under the fixed designation C972; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. 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 for determining compression-recovery characteristics of tape sealant.1.2 Th
3、e values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish approp
4、riate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.NOTE 1There are no ISO standards similar or equivalent to this ASTM standard.1.4 This international standard was developed in accordance with internationally recognize
5、d principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Buildin
6、g Seals and Sealants3. Terminology3.1 DefinitionsFor definitions of terms used in this test method, refer to Terminology C717., standard conditions.4. Significance and Use4.1 Tape sealants are tacky, deformable solids used under compression between two or more surfaces of similar or dissimilarmateri
7、als in a variety of sealing applications. This procedure presents an indication of the compression recovery characteristics ofpreformed tapes.5. Apparatus5.1 Glass Plates, two, each 6.35 by 76.2 by 76.2 mm (0.25 by 3 by 3 in.).5.2 Steel Panels, two, cold-rolled, each 0.762 by 76.2 by 76.2 mm (0.03 b
8、y 3 by 3 in.).NOTE 2Substitutes such as aluminum, acrylic, acrylonitrile-butadiene-styrene (ABS), may be substituted for the plates (5.1) and panels (5.2).5.3 Compression Testing Machine, with a cross-head speed of 50 mm (2 in.)/min and capable of stopping at specified settings.NOTE 3Load values may
9、 differ when determined on screw-type versus spring-type test machines due to a drift past the desired stop in the spring-typemachine. It may be necessary to use shims to obtain the desired stop.5.4 Recorder, for recording compression loads in newtons (or pounds-force).5.5 Stop Watch, measuring in m
10、inutes and seconds.5.6 Gage or Rule, capable of measuring tape thickness to 0.025 mm or 0.001 in.1 This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on GeneralTest Methods.Current edition approved J
11、une 1, 2011June 1, 2018. Published August 2011July 2018. Originally approved in 1982. Last previous edition approved in 20062011 asC972 00 (2006).(2011). DOI: 10.1520/C0972-00R11.10.1520/C0972-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at
12、serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous versi
13、on. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM Internationa
14、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Test Specimen and Sample6.1 Conditioning:6.1.1 Condition the specimens for 24 h at 23 6 2C (73.4 6 3.6F) and 506 10 % relative humidity.standard conditions.6.1.2 Other conditioning parameters may be included as
15、 desired.6.2 Samples to be tested shall be taken from a roll or tape sealant after first removing and discarding approximately the first0.6 m (2 ft) of the roll.6.3 Tape sealant configuration should be approximately 9.53 by 9.53 by 76.2 mm (0.375 by 0.375 by 3 in.). The sample shouldbe re-extruded r
16、ather than plied to conform to the specified size if the sample does not approximate these dimensions.6.4 Total tape volume (V) should be calculated (width by length by thickness) for determination of tape sealant compressionindex.6.5 Prepare two test specimens for each sample as follows:6.5.1 Do no
17、t clean or unnecessarily handle the surfaces of surface-treated or painted plate or panels.6.5.2 Clean plates or panels with detergent or solvent, or both.6.5.3 Place two 76.2 by 9.53 by 9.53-mm (3 by 0.375 by 0.375-in.) lengths of tape sealant on one of the plates or panels, asshown in Fig. 1, and
18、remove the release paper. Place the second plate or panel over the tape sealant to complete the test specimenin accordance with Fig. 1.7. Procedure7.1 Place the specimen in a laboratory press or equivalent equipment, and compress the specimen at 51 mm (2 in.)/min untilthe sealant tape thickness is 5
19、.1 mm (0.20 in.). Maintain the compression mode for exactly 1 min, recording maximum compressiveload in newtons or pounds force.At the end of 1 min, raise the press crosshead and remove the specimen, taking care not to disturbthe specimen.7.2 After removing the specimen from the press, measure and r
20、ecord the tape sealant thickness after 5 min and after2 h.8. Calculations8.1 Calculate the compression load and recovery height for each specimen as follows:R15T125.1 mm 0.200 in.! (1)where:R1 = free recovery height after 5 min, andT1 = tape thickness after 5 min.FIG. 1 Compression Recovery Test Sam
21、pleC972 182R25T225.1 mm 0.200 in.! (2)where:R2 = free recovery height after 2 h, andT2 = tape thickness after 2 h.Pc 5P/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
22、the following:9.1.1 Average recovery height after 5 min and after 2 h to the nearest 5.1 mm (0.001 in.),9.1.2 Average tape sealant compression index in newtons per cubic millimetre (or pounds-force per cubic inch), and9.1.3 Type of compression equipment used.10. Precision and Bias310.1 Three laborat
23、ories were used in the force to compress testing and four laboratories were used for both recovery tests (5min and 2 h).10.2 Repeatability I(r)The repeatability interval (within a given laboratory) for four materials tested by three (or four)laboratories is listed in Table 1 for each of the calculat
24、ed values defined in Section 8.10.3 Reproducibility I(R)The reproducibility interval (between given laboratories) for four materials tested by three (or four)laboratories is listed in Table 1 for each of the calculated values defined in Section 8.11. Keywords11.1 compression; recovery; tape sealantA
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30、 have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C24-1008.TABLE 1 Indexes of PrecisionSource of Variability Symbol Force to Compress, N (lbf) Recovery, 5 min, mm (in.) Recovery, 2 h, mm (in.)Repeatability (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)C972 183
