1、Designation:D121410(Reapproved 2020)Standard 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.1.Scope1.1 This test method covers the sieve analysis of glassspheres us
3、ed 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 thesafety concerns,if any,associated with its use.It is ther
4、esponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-i
5、zation 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:2D346 Practice for Collection and Preparation of CokeSam
6、ples 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 toDetermine the Precision o
7、f 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 glass spheres and th
8、e 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 specifications.NOTE1This
9、 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 glass spheres.5.3 Oven.
10、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)or fraction thereof.Ap
11、proximately 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 D346.Various types of
12、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 the series1This test
13、 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 1,2020.Published June 2020.Originallyapproved in 1952.Last previous edition approve
14、d in 2015 as D1214 10(2015)1.DOI:10.1520/D1214-10R20.2For 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 AST
15、M 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
16、,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.specified 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 other hand on theupstroke.Turn the sieve every 25 strokes about one sixth of arevolution in the same
