1、Designation:D773517Standard Test Method forType A Durometer Hardness Testing of ThermoplasticPavement Marking at Elevated Temperatures1This standard is issued under the fixed designation D7735;the number immediately following the designation indicates the year oforiginal adoption or,in the case of r
2、evision,the year 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 Type A Durometer hardness ofthermoplastic pavement marking material at elevated
3、 tempera-tures.1.2 This test method is similar to Test Method D2240 forhardness with special attention given to keeping the tempera-ture of the test sample and instrument constant.Within thehighway materials community,it is sometimes known as“indentation resistance.”1.3 All materials,instruments or
4、equipment used for thedetermination of temperature,hardness and time shall betraceable to National Institute of Standards and Technology orother internationally recognized organizations parallel in na-ture.1.4 The values stated in SI units are to be regarded asstandard.The values given in parenthese
5、s are for informationonly.1.5 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 to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior
6、 to use.1.6 This international standard was developed 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 TechnicalBarr
7、iers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD2240 Test Method for Rubber PropertyDurometer Hard-nessD7307 Practice for Sampling of Thermoplastic Traffic Mark-ing MaterialsD7308 Practice for Sample Preparati
8、on of ThermoplasticPavement Marking MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 The terms and definitions in Terminology D16 applyt
9、o this method.3.1.2 hardness,advthe value of resistance of a smallpenetrating device.In the case of the Type A Durometer inaccordance with Test Method D2240,the presser foot/indentor(spherical to 0.79 6 0.03 mm or 0.03 6 0.001 in.)is connectedto a spring loaded to a total of 0.075 N/Durometer units
10、at fulldeflection.For reading of Type A hardness the instrumentsscale reads from 0 to 100.Minimal deflection is 0(softest)andmaximum is 100(hardest).3.1.3 thermoplastic,npavement marking(same as 3.1.4).3.1.4 thermoplastic pavement markinga highly filled100%total solids highway marking system that wh
11、en heatedto a molten state can be extruded or sprayed onto a road surfaceand when cooled forms a solid durable delineator or thermo-plastic pavement marking usually melted to 220C(425F).4.Summary of Test Method4.1 This method was developed to enable the testing ofhardness or indentation resistance o
12、f thermoplastic pavementmarking material at ambient roadway/highway temperatures.Due to the speed at which basic thermoplastic pavementmarking cools,testing its hardness at elevated temperatures isdifficult,even at a relatively low 46C(115F).Existingnon-standard methods are not consistent because th
13、ey allow thesamples to change temperature during testing.By keeping both1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved June 1
14、,2017.Published August 2017.Originallyapproved in 2011.Last previous edition approved in 2016 as D7735 11(2016).DOI:10.1520/7735-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informatio
15、n,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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization establis
16、hed 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.1 the test samples and the hardness tester in a regulated environ-ment before and during testing,the results are much morerepeatable within a laboratory.The goal for this method is toallow results from this test to be more reproducible fromlaboratory to laboratory.4.2 The methodology involves measuring the hard
