ASTM_D_5644_-_01_2013.pdf

Designation:D564401(Reapproved 2013)Standard Test Methods forRubber Compounding MaterialsDetermination of ParticleSize Distribution of Recycled Vulcanizate ParticulateRubber1This standard is issued under the fixed designation D5644;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 These test methods describe the procedures for deter-mining average particle size distribution of recycled vulcani-zate particulate.1.2 Method A describes the Ro-tap sieve test method for 60mesh or coarser particles.1.3 Method B describes the ultrasonic technique combinedwith optical microscope especially suitable for 80 mesh or finerparticles.This procedure is based on Test Method D3849.1.4 The values stated in SI units are to be regarded as thestandard.1.5 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:2D297 Test Methods for Rubber ProductsChemical Analy-sisD1416 Test Methods for Rubber from Synthetic SourcesChemical Analysis(Withdrawn 1996)3D1566 Terminology Relating to RubberD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3191 Test Methods for Carbon Black in SBR(Styrene-Butadiene Rubber)Recipe and Evaluation ProceduresD3192 Test Methods for Carbon Black Evaluation in NR(Natural Rubber)D3849 Test Method for Carbon BlackMorphologicalCharacterization of Carbon Black Using Electron Micros-copyD5603 Classification for Rubber Compounding MaterialsRecycled Vulcanizate Particulate RubberE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Practice for Probability Sampling of Materials3.Terminology3.1 Definitions:3.1.1 parent compound,noriginal compound used in theproduct.3.1.2 recycled vulcanizate rubber,nvulcanized rubber thathas been processed to give particulates or other forms ofdifferent shapes,sizes,and size distributions.3.1.3 DiscussionThe words“vulcanizate”and“vulca-nized rubber”are interchangeable.Additional terminologyassociated with this classification can be found in TerminologyD1566.4.Significance and Use4.1 The particulate size distribution of vulcanizate particu-late rubber is used for the purpose of assigning a product meshor average particle size designation.4.2 The product designation for mesh size for the Ro-tapmethod(MethodA,as follows)is based on the size designationscreen which allows a range for the upper limit retained ofmaximum 5%for up to 850 m(20 mesh)particles,maximum10%for 600 to 150 m(30 to 100 mesh),and maximum 15%for 128 to 75 m(120 to 200 mesh).No rubber particles shallbe retained on the zero screen(see Table 1,ClassificationD5603).4.3 For Method A,the weight percent retained on a specificscreen is noted whereas in Method B(ultrasonic technique),the number of particles at a particular size is counted.1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and are the direct responsibility of Subcommittee D11.20 on CompoundingMaterials and Procedures.Current edition approved Nov.1,2013.Published January 2014.Originallyapproved in 1994.Last previous edition approved in 2008 as D5644 01(2008)1.DOI:10.1520/D5644-01R13.2For 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 last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Method B addresses problems that may be caused bytackiness and static electrical forces that recycled rubberparticles exert on each other to form agglomerates,especiallyfor 80 mesh or finer particles.This method eliminates agglom-erate formation by ultrasonically dispersing the particles.4.5 Both methods can be used as a quality control tool.5.Method A:The Ro-tap Method5.1 Summary of Test Method:5.1.1 Method ARo-tap Method:5.1.1.1 A 100 6 1 g specimen of the recycled rubber iscombined with a fixed amount of talc and placed on top of aseries of mesh sieves,with the coarsest sieve being on top andthe finest on the bottom.The specimen is placed in a Ro-tapshaker for 10 to 20 min,depending on the grade of the recycledrubber.The weight of the rubber retained on the individualsieves is then recorded and the mesh designation of the productdetermined.6.Apparatus6.1 Mechanical Sieve Shaker4This is a mechanically op-erated sieve shaker that i