ASTM_B_329_-_14.pdf

Designation:B32914Standard Test Method forApparent Density of Metal Powders and Compounds Usingthe Scott Volumeter1This standard is issued under the fixed designation B329;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 covers determination of the apparentdensity of metal powders and related compounds using theScott Volumeter,also known as the Paint Pigment Volumeter.1.2 With the exception of the values for density and themass used to determine density,for which the use of the gramper cubic centimetre(g/cm3)and gram(g)units is the long-standing industry practice,the values stated in SI units are to beregarded as the standard.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: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 4173.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod see Terminology B243.4.Significance and Use4.1 This test method covers the evaluation of the apparentdensity physical characteristic of powders.The degree ofcorrelation between the results of this test and the quality ofpowders in use will vary with each particular application andhas not been fully determined.4.2 The apparent density measured via this test method isoften referred to as the“Scott Density.”5.Apparatus5.1 Fig.1 shows the Scott Volumeter consisting of thefollowing parts:5.1.1 Top Funnels A large funnel with a 16-mesh screenand a small conical funnel for directing the powder into thebaffle box.Funnels and screen may be brass or stainless steel.5.1.2 Baffle BoxA box with two glass sides and twowooden sides containing a series of four glass baffle plates.The wooden baffle box may be substituted by a water-resistant material,such as stainless steel,if washing is moredesirable than air cleaning.5.1.3 Bottom Funnel A small brass or stainless steelfunnel directly beneath lower baffle box opening for directingthe powder into the density cup.5.1.4 Density Cups A cylindrical cup having a capacity of25.00 6 0.03cm3,withaninsidediameterof28.00 6 0.50 mm;or a square cup with a capacity of16.39 6 0.05 cm3.Density cups may be either brass orstainless steel.5.1.5 StandA 90 pivoting wooden or stainless steel standto support the funnels and the baffle box concentric with thedensity cup so that the bottom funnel lower opening is 19 mmabove the top of the density cup as shown in Fig.1 when usingthe cubic inch cup.Fig.2 shows some suggested modificationsfor use of the metric cup.Modifications A and C of Fig.2 aresuggested when the metric cup is to be used exclusively.Modification B of Fig.2 is suggested when both cups are to beused interchangeably.5.2 Instrument SupportAstand or bench surface,level andvibration free.5.3 BalanceA balance,readable to 0.01 g with a capacityof at least 200 g,to determine the mass to the nearest 0.1 g.5.4 BrushAgood quality,25.4-mm wide brush,preferablynylon.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 B09.03 on Refractory Metal Powders.Current edition approved Dec.1,2014.Published January 2015.Originallyapproved in 1958.Last previous edition approved in 2012 as B329 98(2012).DOI:10.1520/B0329-14.2For 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.*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 States1 5.5 SpatulaA standard 12.7-mm wide stainless steel labo-ratory spatula.6.Test Specimen6.1 Obtain a test portion in accordance with Practices B215.6.2 Aminimum of 25 cm3of powder for the square cup and35 cm3of powder for the cylindrical cup will be needed.7.Calibration and Standardization7.1 The density cups shall be calibrated in accordance withTest Method B873.If the density cup falls outside acceptabletolerance limits,25.00 6 0.03 cm3for the round cup;or asquare cup with a capacity of 16.39 6 0.05 cm3,it is not to beused.FIG.1 Density Apparatus AssemblyFIG.2 Suggested Methods of Modifying the Wooden Scott Volumeter for Metric Density C