1、Designation: C736 12 (Reapproved 2017)Standard Test Method forExtension-Recovery and Adhesion of Latex Sealants1This standard is issued under the fixed designation C736; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast 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 thedetermination of the extension-recovery and adhesion of latexseal
3、ants.1.2 The values stated in SI (metric) units are to be regardedas the standard. The values given in parentheses are providedfor 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 st
4、andard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1A related ISO standard is ISO 7389. Users should compare todetermine how the ISO standard differs from this test method.1.4 This international standard was devel
5、oped in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Docu
6、ments2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC1375 Guide for Substrates Used in Testing Building Sealsand Sealants2.2 ISO Standard:3ISO 7389 Building ConstructionSealantsDetermination ofElastic Recovery3. Terminology3.1 DefinitionsRefer to Terminology C717 for definitionso
7、f the terms used in this test method.4. Summary of Test Method4.1 A joint of prescribed dimensions, between glass andaluminum plates is filled with the sealant. After an agingperiod, the joint width is increased 25 %, the force is removed,and the specimen is permitted to recover. The amount ofrecove
8、ry and the percent of adhesion loss are measured.5. Significance and Use5.1 This test method evaluates the performance of a latexsealant in joints subjected to a limited amount of extension.6. Apparatus6.1 Extension Machine that can be operated at a steady rateof 12.7 mm/min (0.5 in./min) and held a
9、t constant extension for5 min.6.2 Aluminum Alloy Plates, six, anodized, 6.4 by 25.4 by76.2 mm (14 by 1 by 3 in.). Plates shall conform to GuideC1375.6.3 Glass Plates, six, 6.4 by 25.4 by 76.2 mm (14 by1by3 in.). Plates shall conform to Guide C1375.6.4 U Shaped Spacers, six, as shown in Fig. 1(a) mad
10、e of arigid, nonadhering material such as polyethylene, TFE-fluorocarbon, or release-covered metal.6.5 Metal C Clamps, twelve.6.6 Circulating Air Oven, capable of maintaining 50 6 1C(122 6 2F).7. Sampling7.1 Take the sealant to be tested directly from the containeras commercially supplied by the man
11、ufacturer.8. Test Specimens8.1 Prepare a test specimen as follows: Apply a bead ofsealant, 12.7 by 12.7 by 50.8 mm (12 by12 by 2 in.) betweenparallel glass and anodized aluminum plates as shown in Fig.1(b), using rigid, nonadhering spacer bars. Use the C-clamps tohold the test assembly during the fi
12、lling and subsequent curingand handling of the specimens.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealantsand is the direct responsibility of Subcommittee C24.30 onAdhesion.Current edition approved June 1, 2017. Published June 2017. Originallyapproved in
13、1972. Last previous edition approved in 2012 as C736 12. DOI:10.1520/C0736-12R17.2For 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
14、 onthe ASTM website.3Available from the American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with i
15、nternationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.18.2 Prepare five additional specimens as des
16、cribed in 8.1.NOTE 2The glass and aluminum plates shall be cleaned with methylethyl ketone or similar solvent followed by a thorough cleaning with adetergent solution and a final rinse with distilled or deionized water andthen air dried prior to assembly of specimens.9. Conditioning9.1 Cure the six
17、test specimens for 7 days at standardconditions, then for 7 days at 50 6 1C (122 6 2F). After the14-day cure period, condition the specimens for2hatstandardconditions.10. Procedure10.1 Remove the spacers (Fig. 1(c) and insert each speci-men in turn in the extension machine. At the rate of 12.7mm/min
18、 (0.5 in./min), extend the joint width 25 % to 15.9 mm(0.625 in.) and hold at this width for 5 min, meanwhileinspecting the sealant for cohesive or adhesive failure, or both.10.2 Release the force and allow the specimen to recover. Ifthe specimen must be removed from the machine to recover,insert a
19、15.9-mm (0.625-in.) spacer bar during the transfer andthen immediately remove for recovery.10.3 Allow the specimen to stand with the sealant surfaceuppermost undisturbed for a period of 2 h. Measure the jointwidth at the end of this period and determine the percent ofadhesive failure to both glass a
20、nd aluminum.11. Calculation and Interpretation of Results11.1 Percent RecoveryDetermine the percent recovery, D,as follows:D 5 A 2 B!/A 2 C!# 3100 (1)where:A = extended joint width = 15.9 mm (0.625 in.) (by defi-nition of procedure),B = joint width after recovery (as measured), andC = original joint
21、 width = 12.7 mm (0.5 in.).11.2 Percent Adhesive FailureDetermine the percent ad-hesive failure to both glass and aluminum by measurement.12. Report12.1 Report for each of the six specimens, the percentrecovery, percent adhesive failure to both glass and aluminumon all six specimens, and the total a
22、rea of adhesive failure insquare centimetres (square inches) among the six specimens.13. Precision and Bias413.1 PrecisionThe precision calculations for this testmethod are based on the results of four laboratories testingthree materials, each in triplicate. The results are given inTables 1 and 2.13
23、.1.1 Percent RecoveryAt 95 % confidence a variation ofas much as 40.85 % can be expected within a laboratory and57.77 % between laboratories (see Table 1).13.1.2 Percent Adhesive FailureAt 95 % confidence avariation of as much as 57.41 % can be expected both within alaboratory and between laboratori
24、es (see Table 2).4Supporting data is available from ASTM Headquarters. Request RR:C24-1025.FIG. 1 Preparation of Test SpecimenTABLE 1 Precision and Bias DataPercent RecoveryMaterialAverageRecovery, %EstimatedStandardDeviation(WithinLaboratory)EstimatedStandardDeviation(BetweenLaboratory)Repeata-bili
25、ty (In-ternal)Reproduc-ibilityG1 100.00 0.00 0.00 0.00 0.00G2 91.67 14.43 20.41 40.85 57.77G3 100.00 0.00 0.00 0.00 0.00TABLE 2 Precision and Bias DataPercent Adhesion LossMaterialAverageAdhesionLoss, %EstimatedStandardDeviation(WithinLaboratory)EstimatedStandardDeviation(BetweenLaboratory)Repeata-b
26、ility (In-ternal)Reproduc-ibilityG1 8.084 20.29 20.29 57.41 57.41G2 0.001 0.00 0.00 0.00 0.00G3 0.001 0.00 0.00 0.00 0.00C736 12 (2017)213.2 BiasSince there is no accepted reference materialsuitable for determining the bias for this test method, bias hasnot been determined.14. Keywords14.1 adhesion;
27、 latex sealant; recoveryASTM 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 the validity of any such patent rights, and the riskof infringe
28、ment 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. Your comments are invited either for revision of this standard o
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30、nown 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 A
31、STM 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:/ 12 (2017)3
