ASTM_D_1506_-_15.pdf

Designation:D150615Standard Test Methods forCarbon BlackAsh Content1This standard is issued under the fixed designation D1506;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the determination of the ashcontent of carbon black.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement 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 and health practices and determine the applica-bility of regulatory limitations prior to use.For specificprecautionary statements see Sections 6 and 13.2.Referenced Documents2.1 ASTM Standards:2D1799 Practice for Carbon BlackSampling PackagedShipmentsD1900 Practice for Carbon BlackSampling Bulk Ship-mentsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Summary of Test Method3.1 Apre-dried sample(1 h at 125C)is weighed before andafter combustion for 16 h at 550C.The remaining ash isweighed and calculated as a percent of the dried sample.4.Significance and Use4.1 The ash content of a carbon black is the amount ofnon-carbon components present after combustion.Primarycontributants to ash are the manufacturing process water andthe catalyst in the feedstock.Method AMuffle Furnace Method5.Apparatus5.1 Muffle Furnace,capable of temperature regulation of625C at 550C.5.2 Crucibles:5.2.1 Porcelain Crucible,high-form,size O,rim 35 mm,height 29 mm,capacity 15 cm3,with cover size E.5.2.2 Porous Quartz Fiber Crucible,20,50,and 100 mLwith optional disk inserts and lids.35.3 Analytical Balance,having a sensitivity of 0.1 mg.5.4 Desiccator.5.5 Oven,gravity-convection type,capable of temperatureregulation within 61C at 125C and temperature uniformitywithin 65C.6.Hazards6.1 Precautions:6.1.1 Keep the door of the furnace open about 6 mm toadmit air to support the combustion of organic material.6.1.2 Exert care in removing ashed sample from furnace todesiccator.6.1.3 Always keep the cover on the crucible when transfer-ring it to and from the desiccator to prevent the loss of ash dueto air currents.6.1.4 After the sample has cooled in the desiccator,admit airslowly to avoid loss of ash from the crucible.7.Sampling7.1 Samples shall be taken in accordance with PracticesD1799 or D1900.1These test methods are under the jurisdiction of ASTM Committee D24 onCarbon Black and are the direct responsibility of Subcommittee D24.31 onNon-Carbon Black Components of Carbon Black.Current edition approved June 1,2015.Published July 2015.Originally approvedin 1957.Last previous edition approved in 2013 as D1506 99(2013).DOI:10.1520/D1506-15.2For 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.3The sole source of supply of the apparatus(quartz ashing dishes,Part Number303040)known to the committee at this time is CEM Corporation,P.O.Box 200,Matthews,NC 28106.If you are aware of alternative suppliers,please provide thisinformation to ASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Procedure8.1 Porous quartz fiber crucibles and optional disks shouldbe ignited in the furnace at 550 6 25C for at least 15 min.Porcelain crucibles should be ignited with cover in the mufflefurnace at 550 6 25C for 1 h.Place the crucible and cover inthe desiccator.Cool to room temperature and weigh to nearest0.1 mg.8.2 Dry an adequate sample of carbon black for 1 h in thegravity-convection oven set at 125C in an open container ofsuitable dimensions,so that the depth of the black is no morethan 10 mm.Cool and store the sample in a desiccator.8.3 Weigh 2 6 0.1 g of the dried carbon black into theignited crucible and weigh to the nearest 0.1 mg.Place theuncovered crucible and its cover into the furnace(Note 1)at550C for 16 h(porcelain crucible)or 1.5 h(porous quartzfiber cruciblesee 6.1.1).Cover the crucible containing theash,remove from the furnace to the desiccator,and allow tocool to room temperature.Weigh the covered crucible to thenearest 0.1 mg.Put the covered crucible back into the furnacefor additional 0.5 h.Reweigh to the nearest 0.1 mg.Repeat thisweighing process until constant mass is obtained.NOTE1For carbon blacks w