1、Designation: C908 00 (Reapproved 2011)C908 15Standard 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 la
2、st revision. 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 for determining the yield strength of preformed tape sealants.1.2 The val
3、ues stated in acceptable metric units are to be regarded as the standard. The values given in parentheses are forinformation 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 establi
4、sh appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.NOTE 1There are no ISO standards similar or equivalent to this ASTM standard.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and Sealants3. Terminology3.1 Re
5、fer to Terminology C717 for definitions of the following terms used in this test method: adhesive failure; cohesive failure;elongation; modulus; primer; standard conditions; substrate; and tape sealant.4. Significance and Use4.1 Tape sealants are tacky, deformable solids that are used under compress
6、ion between two or more surfaces of similar ordissimilar materials in a variety of sealing applications. This procedure is not intended to simulate an actual use condition but willgive some indication of the cohesive and adhesive bonding properties of the tape. It also provides an indication of the
7、modulusand tensile strength of the sealant tape composition.5. Apparatus5.1 Glass Plates, two, each 6.35 by 76.2 by 76.2 mm (14 by 3 by 3 in.).NOTE 2Other substrates such as aluminum, acrylic, ABS, etc., may be substituted for the plates (5.1) and panels (5.2).5.2 Steel Panels, two, cold-rolled, eac
8、h 0.762 by 76.2 by 76.2 mm (0.03 by 3 by 3 in.) (Note 2).5.3 Laboratory Press, or equivalent.5.4 Tension Testing Machine, or equivalent, with a jaw separation rate of 25 mm (1 in.)/min.5.5 Recorder, for recording the tension load in pascals (or pounds-force).5.6 Rule.5.7 Spacers, 5.1 by 5.1 by 76.2
9、mm (0.20 by 0.20 by 3 in.).6. Sampling6.1 Take samples to be tested taken from a fresh roll of tape sealant after first removing and discarding approximately the first0.61 m (2 ft) of the roll.1 This test method is under the jurisdiction ofASTM Committee C24 on Building Seals and Sealants and is the
10、 direct responsibility of Subcommittee C24.30 on Adhesion.Current edition approved Dec. 1, 2011Dec. 1, 2015. Published January 2012January 2016. Originally approved in 1979. Last previous edition approved in 20062011 asC90800(2006).C90800(2011). DOI: 10.1520/C0908-00R11.10.1520/C0908-15.2 For refere
11、ncedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at 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
12、 user of an ASTM standard an indication of what changes have been made to the previous version. 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 standar
13、d as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Sealant tape configuration should be 9.53 by 9.53 mm (38 by 38 in.). If the sample does not approximate these dimensi
14、ons,the sample should be re-extruded rather than plied up 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 as methyl ethyl ketone.7.1.2 Clean the steel plates with a suitable solvent, suc
15、h as methyl ethyl ketone.NOTE 3If the steel panels have been painted or prepared with other specified 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 by 38 by 38-in.) lengths of tape on one of the steel plates, located as shown in
16、 Fig.1, and remove the release paper. Place a spacer outboard of each tape. Place a glass plate over the tape to complete the testspecimen assembly in accordance with Fig. 1.7.1.4 Compress the assembly at 51 mm (2 in.)/min by means of a laboratory press, or equivalent, until the tape sealant thickne
17、ssis 5.1 mm (0.20 in.), and maintain this compression mode for 1 min. At the end of 1 min raise the press and remove the assembly,taking care not to disturb it.8. Conditioning8.1 Condition the specimens for 24 h at 23 6 2C (73.4 6 3.6F) and 50 6 10 % relative humidity.standard conditions.8.2 Other c
18、onditioning parameters may be included as desired.9. Procedure9.1 Record the average width of the contact area of the tape to the plate glass as measured to the nearest 1.0 mm (132 in.).9.2 Place the test assembly into the jaws of the tension testing machine (Fig. 2).9.3 Pull the test assembly apart
19、 at a jaw separation speed of 25 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 cohesive or adhesive.9.7 In the event of an
20、adhesive failure, record the substrate at 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) =
21、76 mm (3 in.) by 2 by width of contact area 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,FIG. 1 Test Specimens AssemblyC908 15211.1.2 Type of failure, cohesive or adhesive (see 9.5 and 9.
22、6),11.1.3 Type of tension testing machine used (hydraulic or mechanical),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 laboratory) interval for 6 materia
23、ls tested by 4 laboratories is 17.63 kPa(2.557 psi). In future use of this test method, the difference between two test results obtained in the same laboratory on the samematerial will be expected to exceed 17.63 kPa only about 5 % of the time.12.2 ReproducibilityThe reproducibility (between given l
24、aboratories) interval for six materials tested by four laboratories is43.93 kPa (6.372 psi). In future use of this test method, the difference between two test results obtained in a different laboratoryon the same material will be expected to exceed 43.93 kPa only 5 % of the time.13. Keywords13.1 mo
25、dulus; tape sealant; yield strength3 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C24-1035.FIG. 2 Test Specimens in Tension Testing MachineC908 153ASTM International takes no position respecting the validity of any patent rig
26、hts 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 revision at any
27、 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 comments wil
28、l 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 copyrighted by AST
29、M 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 3 Pulling Test Assembly ApartC908 154
