1、Designation:D241520Standard Test Method forAsh in Coal Tar and Pitch1This standard is issued under the fixed designation D2415;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 indicate
2、s the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the ashcontent of tar and pitch.1.2 The values stated in SI units are to be regarded asstandard.No other units of measureme
3、nt are included in thisstandard.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 regulato
4、ry 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 Organi
5、zation TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D850 Test Method for Distillation of Industrial AromaticHydrocarbons and Related MaterialsD4296 Practice for Sampling PitchE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Metho
6、d3.1 The sample is carefully volatilized and burned in amuffle furnace or by other suitable means,after which thecarbonaceous residue is completely oxidized and the remainingash stabilized at 900 C 6 10 C in the muffle furnace.4.Significance and Use4.1 This test method determines the amount of inorg
7、anicmatter in the sample.5.Apparatus5.1 Muffle FurnaceA muffle furnace with good air circu-lation and capable of having its temperature regulated at900 C 6 10 C.5.2 Dish or Crucible,porcelain,silica,or platinum,havinga capacity of 35 mL to 45 mL and a diameter at the top of55 mm to 60 mm.5.3 Sieve,U
8、.S.Standard 600 m(No.30),conforming toSpecification E11.6.Bulk Sampling6.1 Samples from shipments shall be taken in accordancewith Practice D4296 and shall be free of foreign substances.Thoroughly mix the sample immediately before removing arepresentative portion for the determination or for dehydra
9、tion.7.Dehydration of Sample7.1 Hard PitchIf the solid bulk sample contains freewater,air-dry a representative portion in a forced draft oven at50 C.7.2 Soft PitchIf the presence of water is indicated bysurface foam on heating,maintain a representative portion ofthe bulk sample at a temperature betw
10、een 125 C and 150 C inan open container until the surface is free of foam.Take carenot to overheat,and remove heat source immediately whenfoam subsides.7.3 TarDehydrate a representative portion of the bulksample in accordance with Test Method D850,but stop thedistillation when the temperature reache
11、s 170 C.Separate anyoil from the water which has distilled over(if crystals arepresent,warm sufficiently to ensure their solution),and thor-oughly mix the oil with the residual tar in the still after thelatter has cooled to a moderate temperature.8.Preparation of Working Sample8.1 Hard PitchIf the p
12、itch can be crushed at roomtemperature,prepare a 20 g working sample by suitablecrushing,mixing,and quartering of a representative portion ofthe dry sample.The crushing can be done with a small jawcrusher and a mullite mortar and pestle.No particle in therepresentative sample shall be larger than 5
13、mm in any dimen-sion.Crush this sample so that all of it will pass the 600 m(No.30)sieve.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and
14、Carbon Material.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1965.Last previous edition approved in 2015 as D2415 15.DOI:10.1520/D2415-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual
15、 Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international st
16、andard 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.8.2 Soft PitchIf the pitch is too soft to grind and too stickyto mix,heat a representative portion of the dry sample to thelowest temperature that will permit passage through the600 m(No.30)sieve,taking care
