ASTM_D_5230_-_14.pdf

Designation:D523014Standard Test Method forCarbon BlackAutomated Individual Pellet Hardness1This standard is issued under the fixed designation D5230;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 test method covers a procedure for measuringindividual pellet hardness of carbon black by the automatedpellet hardness tester.21.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.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.2.Referenced Documents2.1 ASTM Standards:3D1511 Test Method for Carbon BlackPellet Size Distri-butionD1799 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 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 A sample of carbon black is passed through two sievesto isolate a fraction of uniform size.An appropriate amount ofpellets from this portion is selected and placed into the tester.The individual pellets are pressed against a platen with a loadcell for measuring force.As pressure is applied the pellet willeither break with a rapid force reduction or the pellet willsimply compress.The individual pellet hardness is the maxi-mum force prior to a force reduction of at least 3 cN or themaximum force required to compress the pellet to 90%,whichever comes first.4.Significance and Use4.1 Individual pellet hardness is related to several carbonblack characteristics.Among these are mass strength andattrition.The subsequent level of dispersion obtained in somemixed compounds containing the carbon black may be affectedby pellet hardness.Acceptable pellet hardness must be agreedto by the user and the producer.5.Apparatus5.1 Automated Pellet Hardness Tester,2capable of achiev-ing an absolute measuring accuracy of 62 cN(2 gf)for theforce measurement and 60.1 mm for the diameter measure-ment and a relative accuracy of 60.5 cN(0.5 gf)for the forcemeasurement and 0.02 mm for the diameter measurement andconsisting of the following major components and character-istics.5.1.1 A means for automatic loading of a pellet on thetransport platen for transporting the pellet so as to contact thesecond platen with a minimum force.Typically one platencontains a force measuring device.The required force to detectthe contact shall not exceed 2 cN(2 gf),5.1.2 A means for applying the force at a constant rate,5.1.3 A means for transporting the pellet so to minimize itsmovement during the application of force.5.1.4 A means for measuring the diameter of the individualpellet under test as measured along the axis of the applicationof force.5.1.5 A control device for directing the instrument throughthe test cycle that includes crushing the pellet under controlledconditions,measuring and storing the results of the initialdiameter and crush force determinations,cleaning the frag-ments from the platen surfaces,and starting the next cycle.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.51 on Carbon BlackPellet Properties.Current edition approved Sept.1,2014.Published October 2014.Originallyapproved in 1992.Last previous edition approved in 2013 as D5230 13.DOI:10.1520/D5230-14.2The sole source of supply of the Concarb Titan Automated Pellet HardnessTester known to the committee at this time is Jaron Technologies LLC,2338Duncan,Pampa,TX 79065,E-mail:http:/.The HITEC IPHT isavailable from HITEC Luxembourg,5 rue de L Eglise,L-1458,Luxembourg,E-mail:infohitec.lu,http:/www.hitec.lu/.If you are aware of alternativesuppliers,please provide this information to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1which you may attend.3For 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 States1 5.1.6 An algorithm for determining the individual test endpoint(determination)as the maximum observed force prior tothe first occurrence of either a specified reduction in diameteror a specified reduction in force from the maximum forceobserved,5.1