ASTM C711-2003 Standard Test Method for Low-Temperature Flexibility and Tenacity of One-Part Elastomeric Solvent-Release Type Sealants《单一组份的弹性溶剂释放型密封料的低温挠性及韧性的标准试验方法》.pdf

1、Designation: C 711 03Standard Test Method forLow-Temperature Flexibility and Tenacity of One-Part,Elastomeric, Solvent-Release Type Sealants1This standard is issued under the fixed designation C 711; the number immediately following the designation indicates the year oforiginal adoption or, in the c

2、ase of revision, the year of last revision. 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 determination of the low-temperature flexibility and tenacity of

3、 one-part, elastomeric,solvent-release type sealants after cyclic high- and low-temperature aging.1.2 The subcommittee with jurisdiction is not aware of anysimilar ISO standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsi

4、bility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:C 717 Terminology of Building Seals and Sealants23. Terminology3.1 DefinitionsRefer to Terminolo

5、gy C 717 for definitionsof the following terms used in this Test Method: elastomer,elastomeric, joint, sealant, solvent-release sealant.4. Significance and Use4.1 This test method is not intended to simulate an actualuse condition but it will give some indication of the elastomericproperties or flex

6、ibility of a building joint sealant at lowtemperature. It can serve to differentiate between elastomer-based sealants and sealants based on nonelastic binders that canharden or embrittle on aging and crack or lose adhesion whenflexed at low temperature. In addition, it can aid in identifyingsealants

7、 that have poor flexibility because they are overex-tended and contain a very low level of elastomeric binder aswell as those sealants having binders that will embrittle at lowtemperature.5. Apparatus5.1 Aluminum Panels, 3, thin, approximately 3 in. (76 mm)wide by 5 in. (127 mm) long by 0.012 in. (0

8、.30 mm) thick.5.2 Spatula, steel, with thin knife edge.5.3 Template, rectangular, of steel or brass,18 in. (3.2 mm)high, 1 by 334 in. (25 by 95 mm) inside and approximately 2by 434 in. (51 by 121 mm) outside.5.4 Oven, forced-draft type, having a temperature controlledat 158 6 3.6F (70 6 2C).5.5 Free

9、zer Chest or Cold Box, having a controlled tem-perature of 10 6 5F (23 6 3C).5.6 Mandrel or Rod, with a diameter of14 in. (6.4 mm),with a suitable holder or rack to support it.5.7 Methyl Ethyl Ketone, or similar solvent.6. Sampling6.1 Take the test specimen from a previously unopenedcontainer as rec

10、eived from the sealant manufacturer.7. Test Specimens7.1 Prepare three test specimens as follows:7.1.1 Condition the sealant sample in the original closedcontainer for at least5hat73.4 6 3.6F (23 6 2C) and 50 65 % relative humidity.7.1.2 Thoroughly clean template and aluminum panels withsolvent.7.1.

11、3 Center the template on the aluminum panel andcarefully fill it with compound, avoiding air pockets. Strike offthe surface of the compound flat to a uniform18-in. (3.2-mm)thickness.7.1.4 With the thin knife edge of the spatula, cut all aroundthe outside edge of the compound and lift the template st

12、raightup and off leaving the formed sealant on the plate.8. Conditioning8.1 Condition the specimens for at least 24 h at 73.4 63.6F (23 6 2C) and 50 6 5 % relative humidity.9. Procedure9.1 Expose the conditioned specimens three times to thefollowing temperature cycle:1This test method is under the j

13、urisdiction of ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.20 onGeneral Sealant Standards.Current edition approved May 10, 2003. Published June 2003. Originallyapproved in 1972. Last previous edition approved in 1997 as C 711 93 (1997).2Annua

14、l Book of ASTM Standards, Vol 04.07.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.16hat1586 3.6F 70 6 2C!8hat2 106 5F 223 6 3C! (1)9.2 At the end of the third cycle, while it is in the freezerat 10F (23C) bend the panel through 180

15、 over the14-in.(6.4-mm) diameter mandrel with the sealant side uppermost.Perform the bend in not less than 1 s and not more than 1.5 s.Immediately after bending examine the sealant for cracking,separation, delamination, and adhesive failure. Minor surfacecrazing or hairline cracks and minor edge cra

16、cking may beignored.10. Report10.1 Report any deep cracking, separation, delamination, oradhesive failure. Fig. 1 illustrates a variety of typical results ofthis test method.11. Precision and Bias11.1 In two separate round-robin tests, four laboratoriestested six sealant samples using this procedure

17、. There wasunanimous agreement in both cases in rating the same two(a) Complete Cracking and Adhesive Failure (b) Severe Cracking(c) No Cracking or Adhesive FailureFIG. 1 Low-Temperature Flexibility (Tenacity)C711032samples as showing severe cracking and the same four samplesas showing no cracking o

18、r adhesive failure.12. Keywords12.1 elastomeric; flexibility; solvent-release 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 th

19、e 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 every five years andif not revised, either reapproved or withdrawn. You

20、r 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 technical committee, which you may attend. If you feel that your comments

21、 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 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).C711033