1、Designation:D449710(Reapproved 2018)Standard Test Method forDetermining the Open Time of Hot Melt Adhesives(ManualMethod)1This standard is issued under the fixed designation D4497;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear of last 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 the manual determination of theopen-time range of hot-melt adhesives under the stated condi-
3、tions.1.2 The values stated in SI units are to be regarded as thestandard.The inch-pound units in parentheses are provided forinformation 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 standard t
4、o establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princi
5、ples for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesE177 Practice for Use of the Terms Precision and Bias inASTM Test Meth
6、odsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsMany of the terms found in this testmethod are defined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 open time,nthe time available between app
7、licationof the adhesive to the first substrate and the mating of thesecond substrate which still results in a minimum of 50%fibertear when tested at ambient conditions.4.Summary of Test Method4.1 In this test method,open time is determined by bondingtogether with the adhesive,pieces of standard pape
8、r at intervalsof 5 s sequentially after the molten adhesive has been appliedusing a heated film applicator on one surface.The bondedspecimens are examined later to determine the longest timeperiod,between application of the adhesive to one surface andmating with a second surface,which allows substan
9、tial bond-ing.5.Significance and Use5.1 This test method allows comparing the open time ofseveral hot melt adhesives.5.2 This test method is not intended to provide the open-time observed for a specific adhesive in a specific manufactur-ing operation.This test method can be used to compare theperfor
10、mance of adhesives which are represented to be identicalor to rank the open-time of a group of hot melt adhesives.6.Apparatus6.1 Oven,which meets the precision required by theprocedure,should be used to heat the adhesive sample and theapplicator.6.2 Film ApplicatorMultiple clearance 0.125 to 1.25 mm
11、(5 to 50 mil)square P.G.and T.Number 2 Film Applicator3capable of providing an applied film of adhesive having anominal width of 50 mm(2 in.).6.3 Hand Thermometer,preferably metal,capable of mea-suring the temperature of the hot-melt with an accuracy of61C(62F).1This test method is under the jurisdi
12、ction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.14 on Tape andLabels.Current edition approved Oct.1,2018.Published November 2018.Originallyapproved in 1985.Last previous edition approved in 2010 as D4497 10.DOI:10.1520/D4497-10R18.2For referenced ASTM sta
13、ndards,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 onthe ASTM website.3FilmApplicator No.2 is available from Precision Gage and Tool Company,375Gargrave Rd.,Day
14、ton,OH 45449,www.precisiongage-.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles
15、for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.4 Primary Standard Substrate,200 by 280 mm(8 by 11in.),NBS Standard Reference Material 1810(Liner Board).4Substrates are to be conditioned as
16、described in Practice E177.6.5 Secondary Standard Substrate,125 mm(5 in.)length inthe material direction cut to 19 mm(0.75 in.)wide,NBSStandard Reference Material 1810(Liner Board).36.6 Glass Beakers(600 mL),for melting the adhesive.6.7 Watchglass,to cover beaker.6.8 Beakers,Tongs,and Protective gloves,for handling hotvessels and applicators.6.9 Transparent Pressure Sensitive Tape.6.10 Stop Watch or Other Timer,graduated to at least 0.5 s.6.11 Weighted Rectangular Block,having at least onesmooth
