1、Designation: E 1520 99 (Reapproved 2004)Standard Test Method forParticle Counts Per Pound of Granular Carriers and Dry-Applied Granular Formulations1This standard is issued under the fixed designation E 1520; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the 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 is used to determine the number ofparticles per pound of granu
3、lar carriers and granular pesticideformulations.1.2 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 reg
4、ulatory limitations prior to use. For specificprecautionary statements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E 11 Specification for Wire Cloth and Sieves for TestingPurposesE 725 Test Method for Sampling Granular Carriers andGranular PesticidesE 726 Test Method for Particle Size
5、Distribution of Granu-lar Carriers and Granular PesticidesE 727 Test Methods for Determining Bulk Density ofGranular Carriers and Granular Pesticides3. Summary of Test Method3.1 A known weight of the granular carrier or granularpesticide formulation is placed on the top sieve of a stacked setof U.S.
6、 standard stainless steel screens. The sieves are shakenfor a specified period of time. The weight percent of thegranules retained on each sieve is determined. The number ofparticles per pound of granular material is then calculated.4. Significance and Use4.1 This test method was designed principall
7、y for claygranular carriers and clay-based granular formulations, butneed not be limited to these materials.4.2 This procedure is applicable to granules in the rangefrom 8 to 60 mesh (2.36 to 0.25 mm).4.3 The sieve sizes used to calculate total particle count willbe called the desired range and shou
8、ld be specified as part ofthe test results.5. Apparatus5.1 Mechanical Sieve Shaker, a Tyler RoTap sieve shaker orequivalent.5.2 Sieves, U.S. standard stainless steel 8-in. diameter sievesconforming to Specification E 11.5.3 Bottom Receiver Pan and Top Sieve Cover.5.4 Interval Timer, adjustable, with
9、 an accuracy of +10 s.5.5 Balance, sensitivity of 0.01 g.6. Safety Precautions6.1 Before testing read the precautionary statements on theproduct label or the Material Safety Data Sheet (MSDS), orboth. Take proper precautions to prevent skin contact andinhalation of the fines or vapors, or both. Take
10、 care to preventcontamination of the surrounding area. Always wear theappropriate safety equipment and, where indicated, wear res-piratory devices approved by (NIOSH) for the product beingtested.7. Procedure7.1 Record tare weights of each sieve and bottom pan to60.01 g.7.2 Order stack of screens by
11、size with the finest sieve nextto the pan.7.3 Use a representative sample of 100 6 5 g obtained inaccordance with Test Method E 725.7.4 Weigh the sample to 60.01 g.7.5 Transfer the whole weighed sample onto the top sieve,cover, and shake for 10 min 6 10 s using the mechanical sieveshaker in accordan
12、ce with Test Method E 726 with the hammerdown.7.6 Remove the sieve assembly from the sieve shaker.Weigh each sieve and bottom pan separately. Calculate andrecord the weight of the retained material to the nearest 0.01 gby subtracting the tare weight from the measured sieve weightfor each sieve and b
13、ottom pan.1This test method is under the jurisdiction of ASTM Committee E35 onPesticides and Alternative Control Agents and is the direct responsibility ofSubcommittee E35.22 on Pesticide Formulations and Delivery Systems.Current edition approved Oct. 1, 2004. Published October 2004. Originallyappro
14、ved in 1993. Last previous edition approved in 1999 as E 1520 - 99.2For 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 we
15、bsite.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Calculation8.1 Calculate the percentage distributions in all sieve frac-tions including the bottom pan to give 100 %.R 5 F/S! 3 100 (1)where:F = weight retained on sieve or pan
16、,S = sum of retained weights, andR = percent retained on sieve or pan.8.2 Multiply the percentage of granules retained on eachsieve by the numbers specified in Table 1. Sum these products(P) for the particle count in the desired size range.8.3 Calculate the total particles per pound (kilogram) in th
17、edesired range as follows:3T 531.5 3 PD(2)ST 531.5 3 PD3 2.2046D(3)where:T = total particles per pound in the desired range,P = sum of particle counts in accordance with 8.2, andD = bulk density in pounds per cubic foot in accordancewith Test Methods E 727.9. Disposal of Sample9.1 After testing, sto
18、re all materials in a safe manner anddispose of used material in accordance with product labeldirections or MSDS, or both.10. Precision and Bias10.1 This test method yields comparative data. The pass/failaspect of this test method should be determined by applicablespecifications. When used for speci
19、fication purposes, the me-chanical shaker and test conditions must be agreed upon.10.2 This test method was developed for spherical ornear-spherical particles. Use with non-spherical particles mayproduce erroneous results.11. Keywords11.1 clay; granular carriers; particle count; particle sizeanalysi
20、s; particles per pound; particles per weight; pesticideformulations; sieve analysisASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the
21、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 by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your
22、comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments h
23、ave 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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multip
24、le 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).3Refers to a density of 31.5 lb/ft3for clay used in Footnote B of Table 1.TABLE 1 Sieve Range Part
25、icles per Pound of Each FractionA ,B8/12 1 08012/14 4 30014/16 5 70016/18 7 30016/20 8 30018/20 9 50020/25 14 50020/30 20 00025/30 26 50030/35 46 00030/40 60 00035/40 76 00030/50 97 00040/45 120 00040/50 146 00045/50 175 00050/60 285 000A8/12 and 12/14 multipliers were experimentally determined by Ciba GeigyCorp., Greensboro, NC, 1988, by the same procedure as in Footnote B.BGwyn, Jr., H. M., “Determining the Particle Count per Pound of GranularPesticides,” Agricultural Chemicals, June 1964.E 1520 99 (2004)2
