1、Designation: C908 00 (Reapproved 2011)Standard Test Method forYield Strength of Preformed Tape Sealants1This standard is issued under the fixed designation C908; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. 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 covers a laboratory procedure fordetermining the yield strength of preformed tape sealants.1.2 The values stat
3、ed in acceptable metric units are to beregarded as the standard. The values given in parentheses arefor information only.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-p
4、riate 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:2C717 Terminology of Building Seals and Sealants3. Terminology3.1 Refer to T
5、erminology C717 for definitions of the fol-lowing terms used in this test method: adhesive failure;cohesive failure; elongation; modulus; primer; substrate; andtape sealant.4. Significance and Use4.1 Tape sealants are tacky, deformable solids that are usedunder compression between two or more surfac
6、es of similar ordissimilar materials in a variety of sealing applications. Thisprocedure is not intended to simulate an actual use conditionbut will give some indication of the cohesive and adhesivebonding properties of the tape. It also provides an indication ofthe modulus and tensile strength of t
7、he sealant tape composi-tion.5. Apparatus5.1 Glass Plates, two, each 6.35 by 76.2 by 76.2 mm (14 by3 by 3 in.).NOTE 2Other substrates such as aluminum, acrylic,ABS, etc., may besubstituted for the plates (5.1) and panels (5.2).5.2 Steel Panels, two, cold-rolled, each 0.762 by 76.2 by76.2 mm (0.03 by
8、 3 by 3 in.) (Note 2).5.3 Laboratory Press, or equivalent.5.4 Tension Testing Machine, or equivalent, with a jawseparation rate of 25 mm (1 in.)/min.5.5 Recorder, for recording the tension load in pascals (orpounds-force).5.6 Rule.5.7 Spacers, 5.1 by 5.1 by 76.2 mm (0.20 by 0.20 by 3 in.).6. Samplin
9、g6.1 Take samples to be tested taken from a fresh roll of tapesealant after first removing and discarding approximately thefirst 0.61 m (2 ft) of the roll.6.2 Sealant tape configuration should be 9.53 by 9.53 mm(38 by38 in.). If the sample does not approximate thesedimensions, the sample should be r
10、e-extruded rather than pliedup to conform to the specified size.7. Test Specimens7.1 Prepare two test specimens per sample as follows:7.1.1 Clean the glass plates with a suitable solvent, such asmethyl ethyl ketone.7.1.2 Clean the steel plates with a suitable solvent, such asmethyl ethyl ketone.NOTE
11、 3If the steel panels have been painted or prepared with otherspecified surface treatments, omit this cleaning procedure.NOTE 4Primers may be used.7.1.3 Place two 76.2 by 9.53 by 9.53-mm (3 by38 by38-in.)lengths of tape on one of the steel plates, located as shown inFig. 1, and remove the release pa
12、per. Place a spacer outboard1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.30 onAdhesion.Current edition approved Dec. 1, 2011. Published January 2012. Originallyapproved in 1979. Last previous editi
13、on approved in 2006 as C90800(2006). DOI:10.1520/C0908-00R11.2For 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.
14、1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.of each tape. Place a glass plate over the tape to complete thetest specimen assembly in accordance with Fig. 1.7.1.4 Compress the assembly at 51 mm (2 in.)/min bymeans of a laboratory
15、press, or equivalent, until the tape sealantthickness is 5.1 mm (0.20 in.), and maintain this compressionmode for 1 min. At the end of 1 min raise the press and removethe assembly, taking care not to disturb it.8. Conditioning8.1 Condition the specimens for 24 h at 23 6 2C (73.4 63.6F) and 50 6 10 %
16、 relative humidity.8.2 Other conditioning parameters may be included asdesired.9. Procedure9.1 Record the average width of the contact area of the tapeto the plate glass as measured to the nearest 1.0 mm (132 in.).9.2 Place the test assembly into the jaws of the tensiontesting machine (Fig. 2).9.3 P
17、ull the test assembly apart at a jaw separation speed of25 mm (1 in.)/min (Fig. 3) until the sealant has failed.9.4 Record the peak tension load in newtons (or pounds-force).9.5 Record the modulus at the desired elongation levels.9.6 Record the type of sealant tape failure, either cohesiveor adhesiv
18、e.9.7 In the event of an adhesive failure, record the substrateat which adhesive failure occurred.10. Calculation10.1 For each specimen, calculate the tensile yield strength,Y, in pascals (or pounds-force per square inch) as follows:Y 5FA(1)where:F = peak tension load recorded in 9.4 (N or lbf), and
19、A = area, m2(in.2) = 76 mm (3 in.) by 2 by width of contactarea of each tape as measured in 9.1.11. Report11.1 Report the following information:11.1.1 Yield strength in pascals (or pounds per square inch)of each specimen,11.1.2 Type of failure, cohesive or adhesive (see 9.5 and9.6),11.1.3 Type of te
20、nsion testing machine used (hydraulic ormechanical),11.1.4 Substrates and primers used,11.1.5 Conditioning parameters, and11.1.6 Modulus at the desired elongation levels.12. Precision and Bias312.1 RepeatabilityThe repeatability (within a given labo-ratory) interval for 6 materials tested by 4 labor
21、atories is 17.63kPa (2.557 psi). In future use of this test method, the differencebetween two test results obtained in the same laboratory on thesame material will be expected to exceed 17.63 kPa only about5 % of the time.12.2 ReproducibilityThe reproducibility (between givenlaboratories) interval f
22、or six materials tested by four laborato-ries is 43.93 kPa (6.372 psi). In future use of this test method,the difference between two test results obtained in a differentlaboratory on the same material will be expected to exceed43.93 kPa only 5 % of the time.3Supporting data have been filed at ASTM I
23、nternational Headquarters and maybe obtained by requesting Research Report RR:C24-1035.FIG. 1 Test Specimens AssemblyFIG. 2 Test Specimens in Tension Testing MachineC908 00 (2011)213. Keywords13.1 modulus; tape sealant; yield strengthASTM International takes no position respecting the validity of an
24、y 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 responsibility.This standard is subject to rev
25、ision 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 addressed to ASTM International Headquarters. Your
26、 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 the address shown below.This standard is copyr
27、ighted 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/).FIG. 3 Pulling Test Assembly ApartC908 00 (2011)3
