1、Designation: D 4570 02Standard Test Method forRubber ChemicalsDetermination of Particle Size of Sulfurby Sieving (Dry)1This standard is issued under the fixed designation D 4570; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the particle size measurement ofthe coarse fraction of ground sulfurs. It is limited
3、to measure-ment of particles greater than 45 m (No. 325 sieve). If thesulfur is very fine and the screens become plugged by thecaking of the sulfur, it may be necessary to use a wet sieveprocedure instead.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not
4、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:
5、E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses2E 145 Specification for Gravity-Convection and Forced-Ventilation Ovens33. Significance and Use3.1 This test method is used to evaluate sulfur for suitabilityas a rubber vulcanizing agent. Sulfur particles must be smallenough to dissolve
6、 in rubber during cure to produce a uniformnetwork of cross-links. This test method is used as a qualitycontrol method to ensure that large particles are not present(and to determine if the sulfur follows a typical pattern for sizedistribution).4. Apparatus4.1 Standard Sieves, stainless steel, 203 m
7、m in diameterconforming to Specification E 11. The stainless steel cloth shallrange in mesh size from 45 to 250 m. The sieve set shouldinclude a lid and a bottom pan.4.2 Mechanical Sieve Shakers, such as a Tyler Ro-Tap4orequivalent unit.4.3 Balance, with a minimum capacity of 500 g sensitive to0.1 g
8、.4.4 Balance, with a minimum capacity of 150 g sensitive to0.001 g.4.5 Oven, circulating air type, controlled to 70 6 2C.5. Reagent5.1 Tri-calcium Phosphate, screened to a fineness of lessthan 45 m.6. Procedure6.1 Weigh each sieve to the nearest 0.1 g and assemble inorder of increasing mesh size fro
9、m bottom to top. Add a bottompan. Choice of sieves depends on the information desired.6.2 Into a beaker or suitable container, weigh precisely100.0 g of sulfur to the nearest 0.1 g. When the sulfur is veryfine, add 2.0 g of tri-calcium phosphate (see 5.1) and blendthoroughly using a spatula.6.3 Tran
10、sfer all the sulfur to the top sieve and add the lid.Fix the sieve vest firmly in the mechanical sieve shaker. Runthe unit for 10 min, stop, remove the sieves, and weigh eachsieve to the nearest 0.1 g. Return the sieves to the unit and runan additional 3 min. Reweigh each sieve again to the nearest0
11、.1 g. Repeat until the sieves reach constant mass.7. Calculation7.1 Determine the residue remaining on each sieve by massdifference. For higher precision, transfer the small residue fromthe coarser screen to a weighing dish and weigh to the nearest0.01 g.7.2 The percent residue on each screen is equ
12、al to theamount in grams on each screen.7.3 The percent residue passing through each screen isdetermined by accumulating the total percent material col-lected on that screen and the coarser screens used andsubtracting the total from 100.1This test method is under the jurisdiction of ASTM Committee D
13、11 on Rubberand is the direct responsibility of Subcommittee D11.20 on Compounding Materialsand Procedures.Current edition approved Dec. 10, 2002. Published January 2003. Originallyapproved in 1986. Last previous edition approved in 1998 as D 4570 - 86 (1998).2Annual Book of ASTM Standards, Vol 14.0
14、2.3Annual Book of ASTM Standards, Vol 14.04.4This unit may be purchased from the Fisher Scientific Co., 585 Alpha Dr.,Pittsburgh, PA 15238.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.% residue through (for any screen) =100 sumati
15、on of % sulfur collected on thatscreen and on any coarser screens8. Report8.1 The report should include the following information:8.1.1 Proper identification of samples,8.1.2 Identification of each screen used,8.1.3 The percent residue on each screen, and8.1.4 The percent residue through for each sc
16、reen.9. Precision and Bias9.1 Round robin testing will be conducted, and precisionand bias statements will be balloted for inclusion upon thecompletion of this work.10. Keywords10.1 dry sieving; particle size; sulfurASTM International takes no position respecting the validity of any patent rights as
17、serted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time
18、by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will rec
19、eive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Int
20、ernational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D4570022
