1、Designation: C731 15Standard Test Method forExtrudability, After Package Aging, of Latex Sealants1This standard is issued under the fixed designation C731; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、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 extrudability of latex sealants after freeze-thaw and heat cyc
3、ling.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 user of this standard to
4、 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:2C717 Terminology of Building Seals and Sealants3. Terminology3.1
5、 Definitions: Refer to Terminology C717 for definitionsof the following terms used in this test method: latex sealant,sealant, standard conditions.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 an
6、 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 meth
7、od 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, 64 mm (212 in.) inlength with 3-mm (18-in.) orifice.6.4 Air Compressor, capable of producing 0.34 MPa (50p
8、si).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
9、.1, 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
10、 6 2F).8.2 Condition the sealant which is still in its originalcontainer, for a minimum of 5 days at standard conditions.8.3 Condition the polyethylene cartridge for a minimum of16 h at standard conditions.9. Procedure9.1 After conditioning, transfer the sealant from its con-tainer into the polyethy
11、lene 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 cartridge nozzle.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is t
12、he direct responsibility of Subcommittee C24.20 onGeneral Test Methods.Current edition approved June 1, 2015. Published July 2015. Originally approvedin 1972. Last previous edition approved in 2010 as C731 00(2010). DOI:10.1520/C0731-15.2For referenced ASTM standards, visit the ASTM website, www.ast
13、m.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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States19.3 Weigh
14、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-tracting the tare weigh
15、t 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 Bias312.1 PrecisionThe
16、 precision calculations for this testmethod are based on the results of five laboratories testingthree materials, each in duplicate. The results are given inTable 1.12.2 BiasSince there is no accepted reference materialsuitable for determining the bias for this test method forextrudability, bias has
17、 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 expressly advised that
18、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, either reapprove
19、d 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 attend. If you feel
20、 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. Individual repri
21、nts (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 Cop
22、yright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C24-1017.TABLE 1 Precision and Bias DataAMaterial AverageEstimatedStandardDeviationWithin aLaboratory
23、EstimatedStandardDeviationBetweenLaboratoriesRepeatability(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 within alaboratory and 12.33 g/s between laboratories.C731 152
