1、Designation: C 908 00 (Reapproved 2006)Standard Test Method forYield Strength of Preformed Tape Sealants1This standard is issued under the fixed designation C 908; 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 (e) 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 s
3、tated 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 appr
4、o-priate 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 Refer
5、to Terminology C 717 for definitions of thefollowing 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 sur
6、faces 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 o
7、f the 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
8、 by 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. Samp
9、ling6.1 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 b
10、e re-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.N
11、OTE 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
12、 paper. Place a spacer outboardof 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 press, or equivalent, until the tape sealantthickness is 5.1 mm (0.20 in.), and main
13、tain this compression1This 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 Jan. 1, 2006. Published January 2006. Originallyapproved in 1979. Last previous edition appr
14、oved in 2000 as C 908 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 International, 100 B
15、arr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.mode 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 % relative humidity.8.2 Oth
16、er 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 Pull the test assembly apar
17、t 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 adhesive.9.7 In the event of an a
18、dhesive 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), andA = area, m2(in.2) = 76 mm
19、 (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 tension testing machine used
20、 (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 laboratories is 17.63kPa (2.557
21、 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 for six materials tested by
22、 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.13. Keywords13.1 modulus; tape sealant; yield strength3Supporting da
23、ta have been filed as ASTM Headquarters. Request RR: C24-1035.FIG. 1 Test Specimens AssemblyFIG. 2 Test Specimens in Tension Testing MachineC 908 00 (2006)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard
24、. 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 revision at any time by the responsible technical committee and must be reviewed
25、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 comments will receive careful consideration at a meeting of theresponsible te
26、chnical 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 copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoh
27、ocken, 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).FIG. 3 Pulling Test Assembly ApartC 908 00 (2006)3
