ASTM_C_325_-_07_2014.pdf

Designation:C32507(Reapproved 2014)Standard Guide forWet Sieve Analysis of Ceramic Whiteware Clays1This standard is issued under the fixed designation C325;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 guide covers the wet sieve analysis of ceramicwhiteware clays.This guide is intended for use in testingshipments of clay as well as for plant control tests.1.2 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 for information onlyand are not considered 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:2C322 Practice for Sampling Ceramic Whiteware ClaysE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Apparatus3.1 Stirring DeviceA mechanical stirrer with a three-bladed propeller 2 in.(51 mm)in diameter and having a speedof approximately 1700 r/min,or the equivalent,shall beprovided.3.2 SievesThe sieves shall conform to Specification E11and shall include the No.100(150-m),No.140(106-m),No.200(75-m)and No.325(45-m)sieves(Note 1).The wirecloth for these sieves shall be woven(not twilled)and shall bemounted in circular metal frames 8 in.(203 mm)in diameter,which shall be so constructed as to permit nesting of two ormore sieves.A pan and cover for the sieves shall be provided.NOTE1Equivalent sieves from other standard series,such as the Tylerseries,may also be used.If results are to be compared with those obtainedwith sieves from the ASTM series,it is important that the openings of thesieves used fall within the tolerances specified in Specification E11 for thecorresponding ASTM sieves.4.Sampling4.1 The sample shall be obtained in accordance with Prac-tice C322.4.2 The sample as received shall be placed in a drying ovenat 100 to 110C for a period of not less than 5 h prior to testing.5.Procedure5.1 Transfer duplicate portions,of approximately 250 g ofthe dried clay sample,weighed to the nearest 0.1 g,tocontainers of at least 2-L capacity.Wet the clay with 1 L ofwater and allow to slake for 2 h.If a free-flowing slurry is notproduced by this treatment,add another 500 mL of water.5.2 To ensure complete separation of clay from nonplasticimpurities,agitate the slurry by means of a mechanical stirrer(3.1).Continue the stirring between 5 and 10 min.5.3 Transfer the slaked and stirred sample,without loss,tothe finest sieve to be employed in the test,and wash by meansof a small jet of water from a14-in.(6.4-mm)soft rubber hoseattached to a water supply having a pressure not in excess ofthat of an ordinary city main.The force of the jet may becontrolled by compressing the end of the hose between thethumb and forefinger.Take care to avoid loss of sample fromsplashing.Continue washing until water passing through thesieve shows only traces of sample.Should lumpy materialremain on the screen,return the residue to the stirrer containerby careful washing with a gentle jet of water,and agitate inapproximately 1 L of water for 10 min,then wash the slurry aspreviously described.5.4 Wash the residue remaining on the finest sieve into thepan.Thoroughly wet the remaining sieves to be used in the testwith clear water,and nest them in the proper sequence on thefinest sieve.Wash the residue in the pan quantitatively onto thetop sieve,and give the stack a preliminary washing.5.5 Nest the top sieve on the pan,which shall contain about12in.(12.7 mm)of clear water.Wash the residue by holdingthe pan and sieve firmly in the hands,and by a sidewisemovement,causing water to splash up through the sieve andinto the residue.This movement,coupled with interspersed1This guide is under the jurisdiction of ASTM Committee C21 on CeramicWhitewares and Related Products and is the direct responsibility of SubcommitteeC21.04 on Raw Materials.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1953.Last previous edition approved in 2007 as C325 07.DOI:10.1520/C0325-07R14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 circular motions,allows thorough washing.Wash the residueand water remaining in the pan onto the top sieve of the stack.5.6 Again fill the pan with the proper amount of