1、Designation:D826819Standard Practice forRubber Compounding MaterialsEvaluation of RecycledVulcanizate Particulate Rubber1This standard is issued under the fixed designation D8268;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar 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 practice covers the evaluation methods for thecompounding material commercially known as recycled vul-canizate p
3、articulate rubber.The methods are of general usagein quality control or are needed for the classification of therecycled vulcanizate particulate rubber according to Classifi-cation D5603.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units ar
4、eprovided for information only and 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,health,and environmental practices and deter-min
5、e the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations i
6、ssued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D297 Test Methods for Rubber ProductsChemical Analy-sisD1509 Test Methods for Carbon BlackHeating LossD1566 Terminology Relating to RubberD5603 Classification for Rubber Compoundi
7、ng MaterialsRecycled Vulcanizate RubberD5644 Test Method for Rubber Compounding MaterialsDetermination of Particle Size Distribution of RecycledVulcanizate Particulate RubberE105 Practice for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precisi
8、on,the Average for a Characteristic of aLot or ProcessE1131 Test Method for Compositional Analysis by Thermo-gravimetry3.Terminology3.1 See Terminology D1566.3.2 Definitions:3.2.1 bulk density,nmass per unit volume of a material,including any voids present.3.2.2 particulaterubber,nrubber,vulcanizedo
9、runvulcanized,that has been transformed into a collection ofparticles,with or without a coating of a partitioning agent toprevent agglomeration during production,transportation,orstorage(see buffing rubber,granulated rubber,ground rubber,and powdered rubber).4.Significance and Use4.1 For quality con
10、trol and classification purposes,it isrequired to determine the composition of recycled vulcanizateparticulate rubber.4.2 This practice provides references for standard test meth-ods for composition analysis of rubber and offers a guide formethods widely applied by the recycling industry.5.Sampling5
11、.1 As a process quality control effort,it is recommendedthat samples for the testing be taken for sieve classification atleast once per production shift,once per lot or as agreed uponbetween the customer and the feedstock supplier.5.2 Test portions for sieve testing on products that arecoarser than
12、800 m(20 mesh)are selected in accordance withPractices E105 and E122.6.Test Methods6.1 The test methods in Table 1 shall be used to determinethe composition of recycled vulcanizate particulate rubber.1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andRubber-like Materials and
13、 is the direct responsibility of Subcommittee D11.20 onCompounding Materials and Procedures.Current edition approved July 1,2019.Published July 2019.DOI:10.1520/D8268-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual B
14、ook 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 StatesThis international standard was developed in accordance with internationally recognized
15、principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 7.Test Methods Specific to this Practice7.1 Determination of Metal Conte
16、ntTo determine theferromagnetic metal content,a 100 g specimen of the recycledvulcanizate particulate rubber is placed on a flat nonmagneticsurface.A small horseshoe magnet is passed over and throughthe specimen for 60 s.Weigh the metal fragments collected onthe magnet.The mass in grams represents the percentage offree ferromagnetic metal.7.2 Determination of Fiber Content:7.2.1 Perform a normal sieve analysis procedure in accor-dance with Test Method D5644A.7.2.2 As the test screens are disasse
