ASTM_D_7308_-_17.pdf

Designation:D730817Standard Practice forSample Preparation of Thermoplastic Pavement MarkingMaterials1This standard is issued under the fixed designation D7308;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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 practice covers the proper preparation of testspecimens of thermoplastic pavement marking materials ob-tained to ensure test results are representative of the materialbeing tested.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 to establish appro-priate safety and health practices and determine the applica-bility 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 Principles 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:2D7307 Practice for Sampling of Thermoplastic Traffic Mark-ing Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 thermoplastic pavement marking material,nahighly filled 100%total solids highway marking material thatwhen heated to a molten state can be extruded or sprayed ontoa road surface and when cooled forms a solid,durabledelineator.4.Summary of Practice4.1 The thermoplastic pavement marking material is pre-pared for the testing of various physical and chemical proper-ties as outlined in the governing specification by melting asample of the traffic marking material to its applicationtemperature under continuous agitation.Depending upon therequirements of the governing specification the sample canthen be exposed to the required heating time and conditionsprior to the preparation of the test specimens or the testspecimens may be prepared immediately after the material hasreached application temperature.4.2 If required by the governing specification that thesample be subjected to an extended period of heating prior tothe preparation of the test specimen in order to determine theeffect of heat history upon various physical or chemicalproperties,the sample must be melted down in the prescribedmanner outlined in this practice prior to being subjected to suchconditions.5.Significance and Use5.1 This practice provides a standard procedure for thepreparation of thermoplastic pavement marking material testspecimens prior to testing for various properties as called for inthe governing specification.Specimens that are prepared usingthis standard methodology yield test results that are consistentwith the material from which it was sampled.Test results fromspecimens can be used to determine compliance of the ther-moplastic pavement marking material to the specification.Thispractice can also be used by manufacturers of these materialsto prepare specimens for testing to determine the uniformity ofthermoplastic pavement marking materials from batch to batch.5.2 This practice does not address any issues related tospecific testing of the thermoplastic pavement marking mate-rials for any physical or chemical property.6.Apparatus6.1 Procedure A(Preferred):6.1.1 Stainless Steel 4000 ml Beaker,150 by 230-mmdiameter high.Alternatively an unlined 0.95 L(1 qt)or 3.48 L(1 gal)can may be used depending on the sample size.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 2007.Last previous edition approved in 2012 as D7308 07(2012).DOI:10.1520/D7308-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume 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 StatesThis international standard was developed in accordance with internationally 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.1 6.1.2 Heating Mantle of sufficient size.Note that aluminumfoil may be used to serve as somewhat of a gasket if an unlinedmetal can is to be used in the heating mantle in place of thestainless steel beak