1、Designation:D564418Standard Test Method 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 adoptio
2、n 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 describes the procedures for determin-ing average particle size d
3、istribution of recycled vulcanizateparticulate rubber by the Ro-tap sieve test method for 90 m(170 mesh)or larger particles.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is
4、 theresponsibility 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 stand
5、ard-ization 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:2D1566 Terminology Relating to RubberD5603 Classifi
6、cation 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 vul
7、canizate 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 Ter
8、minologyD1566.4.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 is based on the size designation screen
9、which allows arange for the upper limit retained of maximum 5%for up to850 m(20 mesh)particles,maximum 10%for 850 to 150 m(20 to 100 mesh),and maximum 15%for 125 to 20 m(120to 635 mesh).No rubber particles shall be retained on the zeroscreen(see Table 2,Classification D5603).4.3 The weight percent r
10、etained on a specific screen isnoted.5.Summary of Test Method5.1 Ro-tap Method,Mechanical Vibratory Sieve ShakerA100 6 1 g specimen of the recycled rubber is combined witha fixed amount of flowing agent(for example,hydrous mag-nesium silicate(talc),fumed,aluminum oxide,fumed silica,orcalcium carbona
11、te)and placed on top of a series of meshsieves,with the coarsest sieve being on top and the finest on thebottom.The specimen is placed in a Ro-tap shaker for 10 to 20min,depending on the grade of the recycled rubber.The weightof the rubber retained on the individual sieves is then recordedand the me
12、sh designation of the product determined.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand Rubber-like Materials and is the direct responsibility of Subcommittee D11.20on Compounding Materials and Procedures.Current edition approved June 1,2018.Published July 2018.Origin
13、ally approvedin 1994.Last previous edition approved in 2013 as D5644 01(2013).DOI:10.1520/D5644-18.2For 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
14、 Summary page onthe ASTM website.Copyright ASTM 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
15、 for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Apparatus6.1 Mechanical Sieve Shaker3This is a mechanicallyoperated sieve shaker that imparts a uniform rotary and tappingmotion to a stack o
16、f 200 mm(7.9 in.)sieves in accordance with6.2.The sieve shaker should be adjusted to accommodate astack of sieves,receiver pan,and cover plate.The bottom stopsshould be adjusted to give a clearance of 1.5 mm(0.06 in.)between the bottom plate and the screens so that the screenswill be free to rotate.The sieve shaker machine shall bepowered with an electric motor operating 28.75 to 29.17 Hz(1725 to 1750 rpm).This will produce 2.33 to 2.60 Hz and 280to 320 rotary motions/min.The cover plate shall b
