ASTM_D_1937_-_13.pdf

Designation:D193713Standard Test Method forCarbon Black,PelletedMass Strength1This standard is issued under the fixed designation D1937;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 the determination of the massstrength of pelleted carbon black.It is designed to determinethe force required to pack a cylindrical column with pelletedcarbon black.The results of this test are believed to relate to theability of the carbon black to flow in bulk handling systems.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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: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 ManufacturingIndustries3.Summary of Test Method3.1 Asample of carbon black is placed in a vertical cylinderand pressed with a plunger for 10 s after which the bottom ofthe cylinder is opened,whereupon all of the carbon black eitherfalls out the bottom or forms a ring or bridge in the cylinder.The process is repeated with a new sample until the minimumforce required for the carbon black to form a ring or bridge isfound.The resultant force is called mass strength and isreported in Newtons(lbf).4.Significance and Use4.1 Mass strength gives an indication of the flowability inbulk handling.It is affected by pellet properties such ashardness,size,shape,and especially fines content.Due to theinfluence of other variables,the user and the producer mustdetermine an acceptable mass strength level.5.Apparatus5.1 Mass Strength Tester,3with a flat compression cylinderof 50.8 mm(2 in.)diameter.5.2 Calibrating Block,made from a cylindrical woodenshaft,47 mm(1.8 in.)in diameter and 250 mm(10 in.)long.5.3 Platform Scale,4to 50-kg(100 lb)capacity with asensitivity of 0.1 kg(0.02 lb)for air pressure gage calibration.5.4 Overflow Cup to Fit Around Cylinder,normally part ofthe apparatus delivery.5.5 Spatula,with a straight edge of at least 55 mm(2.2 in.).6.Sampling6.1 Samples shall be taken in accordance with PracticesD1799 or D1900.7.Calibration7.1 Remove the original faceplate from the pressure gageand replace with a blank plate made from aluminum or othersuitable material.7.2 Place the platform scale under the cylinder.With thesliding door in an open position,pass the calibrating blockthrough the cylinder so it will rest on the platform of theplatform scale.The top of the calibrating block shall be nearthe cylinder top.The calibrating block must fit freely in thecylinder and not bind against any inside surface.Adjust theplatform scale for zero position with the calibrating block inplace.Mark the zero position on the blank plate.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 June 1,2013.Published July 2013.Originally approvedin 1962.Last previous edition approved in 2012 as D1937 12.DOI:10.1520/D1937-13.2For 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 mass strength tester known to the committeeat this time is Titan Specialties,Inc.,P.O.Box 2316,Pampa,TX 79066-2316.TestMethod D1937 84 contains details for the construction of this apparatus.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.4AFairbanks Morse platform scale,Model 411000(beam suffix FM)is suitablefor this purpose.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.3 Adjust the air-flow regulator until the needle on the airpressure gage has moved from rest or zero position,toone-third or more of total gage capacity.7.4 Activate the timer,allowing the plunger to press againstthe calibrating block.Measure the equivalent mass producedby the plunger with the platform scale.7.5 Repeat 7.4,adjusting the regulator until even multiplesof 50 N or 10 lbf are obtained.Mark the plate at these values.7.6 Betwee