1、Designation:D121410(Reapproved 2015)1Standard Test Method forSieve Analysis of Glass Spheres1This standard is issued under the fixed designation D1214;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、 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.1NOTEAn editorial change was made in 6.1 in June 2015.1.Scope1.1 This t
3、est method covers the sieve analysis of glassspheres used for retroreflective pavements markings and indus-trial uses.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 thesa
4、fety 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:2D346 Practice for Collection and P
5、reparation of CokeSamples for Laboratory AnalysisD2013 Practice for Preparing Coal Samples for AnalysisE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDete
6、rmine the Precision of a Test Method3.Summary of Test Method3.1 The spheres are hand-sieved through standard sieves,starting with the sieve with the largest opening specified andprogressing successively through the specified sieves in theorder of decreasing size of opening,and computing the weightof
7、 glass spheres and the percent passing each of the sieves.4.Significance and Use4.1 The size or gradation of glass spheres is one measurableaspect of performance as a retroreflective media.The functionof this test is to measure the size of glass spheres and todetermine compliance with applicable spe
8、cifications.NOTE1This method has been used in other industrial areas outsidethe intended scope of this test method.5.Apparatus5.1 Balance,sensitive to 50 mg.5.2 Sieves,200 mm(8 in.)in diameter,conforming toSpecification E11,and including such sieves as may berequired by the specifications for the gl
9、ass spheres.5.3 Oven.6.Samples6.1 By quartering or riffle sampling(Note 2),select arepresentative sample from the material to be tested.Take atleast two representative samples of approximately 500 g eachfrom separate packages from each shipment in the ratio of twosamples for each 5000 kg(10 000 lb)o
10、r fraction thereof.Approximately 50 g(1.76 oz)of dry glass spheres are requiredfor each test.This specimen is also selected by quartering orriffling.NOTE2The quartering procedure for reducing bulk samples,to obtainrepresentative test samples of suitable size,is described and illustrated inPractice D
11、346.Various types of riffle samplers are illustrated in PracticeD2013.7.Procedure7.1 Hand Sieving:7.1.1 Dry the specimen to substantially constant weight at atemperature of 105 to 110 C.7.1.2 Weigh 50 g of the dried glass spheres to the nearest 0.1g and place on the sieve with the largest opening in
12、 the seriesspecified for the test,which shall be thoroughly dry.Hold thesieve,with pan and cover attached,in one hand in a slightlyinclined position so that the specimen will be well distributedover the sieve,at the same time gently striking the side about150 times per minute against the palm of the
13、 other hand on the1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 1952.L
14、ast previous edition approved in 2010 as D1214 10.DOI:10.1520/D1214-10R15E01.2For 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 AS
15、TM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 upstroke.Turn the sieve every 25 strokes about one sixth of arevolution in the same direction.Continue the operation untilnot more than 0.05 g passes through the sieve in 1 min of
16、continuous sieving.Each time,before weighing the materialpassing through the sieve,tap the side of the sieve with thebrush handle in order to remove any material adhering to thewire cloth.7.1.3 When the sieving has been finished,remove the coverof the sieve and carefully remove the residue remaining on thesieve to a tared container.Invert the sieve over a piece ofglazed white paper and clean the wire cloth by brushing theunderside.Add the material thus removed from the wire clothto the residue r
