ASTM_B_212_-_17.pdf

Designation:B21217Standard Test Method forApparent Density of Free-Flowing Metal Powders Using theHall Flowmeter Funnel1This standard is issued under the fixed designation B212;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.Scope*1.1 This test method describes a procedure for determiningthe apparent density of free-flowing metal powders,and mixedpowders;and is suitable for only those powders that will flowunaided through the specified Hall Flowmeter funnel.1.2 With the exception of the values for mass,volume,anddensity,for which the use of the gram and the cubic centimetreunits is the long-standing industry practice,the values stated ininch-pound units are to be regarded as standard.The valuesgiven in parentheses are mathematical conversions to SI unitsthat are provided for information only and are not consideredstandard.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.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 Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2B215 Practices for Sampling Metal PowdersB243 Terminology of Powder MetallurgyB873 Test Method for Measuring Volume of Apparent Den-sity Cup Used in Test Methods B 212,B 329,and B 417E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,see Terminology B243.Additional descriptive PMinformation is available in the Related Materials section of Vol.02.05 of the Annual Book of ASTM Standards.4.Summary of Test Method4.1 Avolume of powder is permitted to flow into a containerof definite volume under controlled conditions.The mass ofpowder per unit volume is determined and reported as apparentdensity,Hall(ADH).5.Significance and Use5.1 This test method provides a guide for evaluation of animportant physical characteristic of a powder known as theapparent density.The measured apparent density bears arelationship to the mass of powder that will fill a fixed volumedie cavity.The degree of correlation between the results of thistest and the performance of powders during use may vary witheach particular application.Note,however,that the presence ofmoisture,oils,stearic acid,stearates,waxes,and the tempera-ture of the powder mass may alter the physical characteristicsof the powder.6.Apparatus6.1 Powder Flowmeter Funnel3A calibrated Hall Flow-meter funnel(Fig.1).6.2 Density CupA cylindrical brass cup(Fig.2)having anominal capacity of 25 cm3.The actual cup volume shall bedetermined according to Test Method B873.If the measuredvolume of the cup is outside the tolerance in Fig.2(25 6 0.03 cm3)the cup shall not be used.1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.02 on Base Metal Powders.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1946.Last previous edition approved in 2013 as B212 13.DOI:10.1520/B0212-17.2For 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 known to the committee at this timeis ACuPowder International,LLC,901 Lehigh Ave.,Union,NJ 07083-7632.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.*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 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 issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.3 Stand3A stand(Fig.1)to support the Hall Flowmeterfunnel concentric with the density cup so that th