1、Designation:D2319/D2319M20Standard Test Method forSoftening Point of Pitch(Cube-in-Air Method)1This standard is issued under the fixed designation D2319/D2319M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision
2、.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the soft-ening point above 80 C 176 F of pitch.Test Method D3104gives comparable results.1
3、.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the s
4、tandard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to
5、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
6、 to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D61 Test Method for Softening Point of Pitches(Cube-in-Water Method)D3104 Test Method for Softening Point of Pitches(MettlerSoftening Point Method)D4296 Practice for Sampling PitchE1 Specification for ASTM Liquid-in-Glass Thermometers
7、3.Summary of Test Method3.1 Two cubes of pitch,supported on wire hooks,are heatedin a standardized air oven at a linear rate.The softening pointis the mean of the temperatures at which the cubes sagdownwards a distance of 60 mm 2.4 in.4.Significance and Use4.1 Pitch does not go through a solid-liqui
8、d phase changewhen heated and therefore does not have a true melting point.As the temperature is raised,pitch softens and becomes lessviscous.The softening point is arbitrarily defined and must bedetermined by a closely controlled method that must becarefully followed if test results are to be repro
9、ducible.4.2 This test method is useful in determining the consis-tency of pitch as one element in establishing the uniformity ofshipments and sources of supply.5.Apparatus35.1 Air OvenThe oven shall be cylindrical,150 mm 6 in.in inside diameter by 155 mm 6.2 in.in height.It shall havetwo 75 mm 3 in.
10、diameter windows of mica,centeredvertically on opposite sides,and shall be fitted with a coverhaving a central opening 25 mm 1 in.in diameter to hold athermometer,and a concentric ring suspended below to supportthe hooks with attached specimens.The ring shall be made of6 mm 0.25 in.brass,shall be 54
11、 mm 2.125 in.in outsidediameter,and shall be centrally suspended 30 mm 1.2 in.below the cover.The cover shall have two 3 mm 0.12 in.holes on a diagonal 50 mm 2 in.from the center.On thebottom of the oven,an inner pan 140 mm 5.6 in.in diametershall rest on three brass legs 5 mm 0.2 in.in height faste
12、nedto the bottom of the pan to provide an air space between thepan and the bottom of the oven.The side wall,cover,and panshall be made of 0.7 mm 0.028 in.thick or 22 gauge(BWG)copper sheet,and the bottom of 0.8 mm 0.032 in.thick or21 gauge copper.5.2 Tripod for Use with Gas BurnerThe tripod ring sha
13、llbe approximately 125 mm 5 in.in inside diameter so that theoven is supported only on its outer edges.It shall be 200 mm8 in.in height.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D
14、02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1964.Last previous edition approved in 2014 as D2319/D2319M 141.DOI:10.1520/D2319_D2319M-20.2For referenced ASTM standards,visit the ASTM website,www.astm.or
15、g,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of the softening point apparatus items,obtainable asa unit on special order,known to the committee at th
16、is time is HumboldtManufacturing Co.,7302 W.Agatite Ave.,Chicago,IL 60656.If you are aware ofalternative suppliers,please provide this information to ASTM InternationalHeadquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.All other apparatus itemsdescribed may be obtained from any regular laboratory equipment supply house.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,1
