1、Designation:D7724181Standard Test Method forCarbon BlackNon-Dispersible Matter by MechanicalFlushing(NDM)1This standard is issued under the fixed designation D7724;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTECorrected Section 11 editorially in January 2020.1.Scope1.1 This test method covers the determination of non-dispersible matter after mech
3、anical water flushing of regularuntreated carbon blacks.It may not be applicable to oil-treatedcarbon blacks because the oil would prevent proper wetting ofthe black by water.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.
4、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 use.1.4 Th
5、is 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(
6、TBT)Committee.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 ManufacturingIndustriesE11 Specifica
7、tion for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 A sample of carbon black is mechanically flushed withwater through a wire-mesh screen of a specified size until allthat remains is a non-dispersible matter of carbon black.Thenon-dispersible matter is dried,weighed,and th
8、e amount ofresidue is expressed as mg/kg(ppm)of the original sample.4.Significance and Use4.1 The quantity of non-dispersible matter of carbon blackis important in some molded or extruded products as it mayrelate to the surface appearance of those products.The maxi-mum amount of non dispersible matt
9、er and the minimum sizeof the particles to be analyzed in each application is normallydetermined and agreed to between the user and the producer.5.Apparatus5.1 Sieve Apparatus,as shown in Fig.1.35.2 Balance,with a sensitivity of 0.01 g.5.3 Analytical Balance,with a sensitivity of 0.1 mg.5.4 Oven,gra
10、vity-convection type,capable of temperatureregulation within 61C at 125C and temperature uniformitywithin 65C.5.5 Sieves,diameter 100 mm,of either phosphor bronze orstainless steel.3The sieve shall be in accordance with Specifi-cation E11.The sieve size to be used shall be agreed uponbetween the pur
11、chaser and the carbon black manufacture.5.6 Weighing Dishes.6.Precautions6.1 Install the apparatus as described in the manufacturersinstructions and keep it clean at all times to prevent contami-nation.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct
12、 responsibility of Subcommittee D24.31 on Non-CarbonBlack Components of Carbon Black.Current edition approved June 1,2018.Published July 2018.Originally approvedin 2011.Last previous edition approved in 2016 as D7724 11(2016).DOI:10.1520/D7724-18E01.2For referenced ASTM standards,visit the ASTM webs
13、ite,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 known to the committee at this timeis Krahnen IQS,GmbH,Paffrather Str.13
14、15,D-51069 Koeln,Germany.If you areaware of alternative suppliers,please provide this information to ASTM Interna-tional Headquarters.Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor
15、 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 iss
16、ued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.6.2 Examine the sieves each time they are used to make surethat no cracks or holes have developed.7.Sampling7.1 Samples shall be taken in accordance with PracticeD1799 or Practice D1900.8.Procedure8.1 Prior to each test series adjust the water pressure to 4006 20 kPa in accordance with the manufacturers instructions.Make sure that only the spraying nozzle is operating whenpressure is adjusted.NOTE1The pressure will dro