1、Designation:D617503(Reapproved 2013)Standard Test Method forRadial Crush Strength of Extruded Catalyst and CatalystCarrier Particles1This standard is issued under the fixed designation D6175;the number immediately following the designation indicates the year oforiginal adoption or,in the case of rev
2、ision,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 and is suitable for determiningthe resistance of extruded catalysts and catalyst
3、carriers tocompressive force from the side.1.2 This test method was developed using extruded catalystand catalyst carriers from116to18in.in diameter(0.159 to0.318 cm)and limited to pieces with a length to diameter ratiogreater than or equal to 1:1.This test method may be applicableto other diameters
4、.1.3 This test method is suitable for the determination ofmean crush strength per millimetre in the range of 0 to 15lbf/mm(0 to 65 N/mm).1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided f
5、or information onlyand are not considered standard.1.5 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 to determine theapplicability of re
6、gulatory limitations before use.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts and CatalysisE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory S
7、tudy toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsSee Terminology D3766.3.2 Definitions of Terms Specific to This Standard:3.2.1 extruded catalyst particlescylindrical particles withuniform cross sections,either solid,hollow core,or multi-lobed,formed by extrusion.4.Summary
8、of Test Method4.1 Individual extrudates taken from a representativesample are calcined,measured in length,placed between twoflat surfaces,and subjected to a compressive force.The forcerequired to crush the extrudate is measured.The procedure isreplicated,the force per millimetre calculated,and the a
9、verageof all quotients determined.5.Significance and Use5.1 This test method is intended to provide information onthe ability of an extruded catalyst to retain physical integrityduring use.6.Apparatus6.1 A suitable compression testing device is required,com-posed of the following:6.1.1 Calibrated Pr
10、essure or Force Gage,marked for directreading of the force in pounds force(Newtons)with a rangeabout two times the expected average force reading.A suitablesystem(mechanical,hydraulic,or pneumatic)must be pro-vided so that the rate of force applied is both uniform andcontrollable within specified li
11、mits(see 9.4).6.1.2 Tool Steel Anvils,between which the sample will becrushed.The faces of the tool steel anvils shall be smooth andfree from hollows or ridges that would interfere with uniformcontact along the length of the extrudate.The faces shall beparallel to each along their entire length of t
12、ravel.The faces ofboth anvils must be longer in one dimension than the length ofthe sample pieces to be crushed.6.2 A device for determining length,reading in millimetres,and of suitable accuracy to measure to the nearest tenth.1This test method is under the jurisdiction of ASTM Committee D32 onCata
13、lysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 1998.Last previous edition approved in 2008 as D617503(2008).DOI:10.1520/D6175-03R13.2For referenced ASTM standards,visit t
14、he 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 St
15、ates1 7.Sampling7.1 A test sample of 50 to 200 individual particles shall beobtained from larger composites by riffling or splitting accord-ing to STP 447A,3with the aim of obtaining a representativesample that represents both the shape and size of the largercomposite.The amount of the sample shall
16、depend on theprecision required and the homogeneity of the material beingtested.All of the individual particles sampled that have a lengthto diameter ratio greater than or equal to one shall be tested.7.2 Heat the test sample(s)at 400 6 15C for not less than3 h.NOTE1Moisture pick-up by extrudates is often rapid and themeasured crush strength may be affected.7.3 After heating,cool the test sample(s)in a desiccator orother suitable container to prevent the adsorption of moisturebefore testing.NOTE