1、Designation: C 731 00 (Reapproved 2006)Standard Test Method forExtrudability, After Package Aging, of Latex Sealants1This standard is issued under the fixed designation C 731; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 a laboratory procedure for thedetermination of extrudability of latex sealants after fre
3、eze-thaw and heat cycling.1.2 The values stated in metric (SI) units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the use
4、r of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1Currently there is no ISO standard similar to this test method.2. Referenced Documents2.1 ASTM Standards:2C 717 Terminology of Building Seals and Sea
5、lants3. Terminology3.1 DefinitionRefer to Terminology C 717 for defini-tions of the following terms used in this test method: latexsealant, sealant.4. Summary of Test Method4.1 After being subjected to 5 freeze-thaw cycles followedby 7 days of heat aging, the sealant is extruded under pressurefrom a
6、n air-powered caulking gun, and the extrudability ismeasured in grams per second.5. Significance and Use5.1 Extrudability measurements of latex sealants serve toindicate only their ease of application; they do not predict theperformance capability of the compound after installation.5.2 This test met
7、hod also measures freeze-thaw and heatstability of such sealants.6. Apparatus6.1 Caulking Gun, air-powdered.6.2 Polyethylene Cartridge, 6 fluid oz. and plunger.6.3 Polyethylene Cartridge Nozzle,64mm(212 in.) inlength with 3-mm (18-in.) orifice.6.4 Air Compressor, capable of producing 50 psi (0.34MPa
8、).6.5 Freezer, capable of maintaining 17 6 1C (0 6 2F).6.6 Circulating Air Oven, capable of maintaining 50 6 1C(122 6 2F).6.7 Stop Watch, standard laboratory.6.8 Analytical Balance, accurate to 1 g.6.9 Jar, approximately 0.5 L (1-pt).6.10 Spatula.7. Sampling7.1 After conditioning as specified in 8.1
9、, take the sealant tobe tested directly from a container as commercially supplied bythe manufacturer.8. Conditioning8.1 Subject the sealant in its original container to 5 freeze-thaw cycles, each cycle consisting of 16 h at 176 1C (0 62F) and8hat236 1C (73.46 2F), followed by 7 days at50 6 1C (122 6
10、 2F).8.2 Condition the sealant which is still in its originalcontainer, for a minimum of 5 days at 23 6 1C (73.4 6 2F)and 50 6 5 % relative humidity.8.3 Condition the polyethylene cartridge for a minimum of16 h at the same conditions as specified in 8.2.1This test method is under the jurisdiction of
11、ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.20 onGeneral Test Methods.Current edition approved May 1, 2006. Published May 2006. Originallyapproved in 1972. Last previous edition approved in 2000 as C 731 00.2For referenced ASTM standards, vis
12、it 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2
13、959, United States.9. Procedure9.1 After conditioning, transfer the sealant from its con-tainer into the polyethylene cartridge either by gunning or withthe spatula. Avoid trapping air in the sealant during transfer.9.2 Place the filled cartridge in the air-powered caulkinggun and attach the cartrid
14、ge nozzle.9.3 Weigh the jar and record its tare weight.9.4 Gun the entire contents of the cartridge at 0.34 MPa (50psi) into the empty, tared, jar, using a stop watch to time theextrusion.9.5 Weigh the jar containing the sealant.10. Calculation10.1 Calculate the weight of sealant extruded by sub-tra
15、cting the tare weight of the jar from the weight obtained in9.5.10.2 Calculate the rate of extrudability as follows:Rate of extrudability 5 w/t (1)where:w = weight of compound extruded, g, andt = elapsed time, s.11. Report11.1 Report the rate of extrudability in grams per second.12. Precision and Bi
16、as312.1 PrecisionThe precision calculations for this testmethod are based on the results of five laboratories testingthree materials, each in duplicate.The results are given inTable1.12.2 BiasSince there is no accepted reference materialsuitable for determining the bias for this test method forextru
17、dability, bias has not been determined.13. Keywords13.1 extrudability; freeze-thaw stability; heat stability; latexsealantASTM 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 expre
18、ssly 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 every five years andif not revised
19、, 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 technical committee, which you may a
20、ttend. 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 Conshohocken, PA 19428-2959,United States
21、. 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).3Supporting data is available from ASTM. Request RR:C24-101
22、7.TABLE 1 Precision and Bias DataAMaterial AverageEstimatedStandardDeviationWithin aLaboratoryEstimatedStandardDeviationBetweenLaboratoriesRepeatability(Internal)ReproducibilityG1 14.92 0.29 4.36 0.81 12.33G2 14.57 0.58 3.36 1.64 9.50G3 14.82 0.83 3.71 2.36 10.49AAt 95 % confidence a variation of as much as 2.36 g/s can be expected withina laboratory and 12.33 g/s between laboratories.C 731 00 (2006)2
