1、Designation: D 5817 03a (Reapproved 2008)Standard Practice forCarbon Black, PelletedReduction, Blending, and Drying ofGross Samples for Testing1This standard is issued under the fixed designation D 5817; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he 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 practice describes the procedure for blending ofpelleted carbon black, the proce
3、dure for the reduction of grosssamples of pelleted carbon black to the appropriate size fortesting and the preparation of the sample for testing. Thesetechniques are intended to minimize variations in measuredcharacteristics between test samples. Standard terminologyrelating to carbon black samples
4、is found in TerminologyD 3053.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.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
5、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:2D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 1506 Test Methods for Carbon BlackAsh
6、ContentD 1508 Test Method for Carbon Black, Pelleted Fines andAttritionD 1509 Test Methods for Carbon BlackHeating LossD 1510 Test Method for Carbon BlackIodine AdsorptionNumberD 1511 Test Method for Carbon BlackPellet Size Distri-butionD 1512 Test Methods for Carbon BlackpH ValueD 1513 Test Method
7、for Carbon Black, PelletedPourDensityD 1514 Test Method for Carbon BlackSieve ResidueD 1618 Test Method for Carbon Black ExtractablesTransmittance of Toluene ExtractD 1619 Test Methods for Carbon BlackSulfur ContentD 1765 Classification System for Carbon Blacks Used inRubber ProductsD 1799 Practice
8、for Carbon BlackSampling PackagedShipmentsD 1900 Practice for Carbon BlackSampling Bulk Ship-mentsD 2414 Test Method for Carbon BlackOil AbsorptionNumber (OAN)D 3053 Terminology Relating to Carbon BlackD 3191 Test Methods for Carbon Black in SBR (Styrene-Butadiene Rubber)Recipe and Evaluation Proced
9、uresD 3192 Test Methods for Carbon Black Evaluation in NR(Natural Rubber)D 3265 Test Method for Carbon BlackTint StrengthD 3493 Test Method for Carbon BlackOil AbsorptionNumber of Compressed Sample (COAN)D 5230 Test Method for Carbon BlackAutomated Indi-vidual Pellet HardnessD 6556 Test Method for C
10、arbon BlackTotal and ExternalSurface Area by Nitrogen Adsorption3. Summary of Test Methods3.1 Test Method AReduction of Sample Size:3.1.1 The gross bulk sample is poured through the rifflesample splitter. A portion of the sample is reintroduced into thesplitter as many times as necessary to reduce t
11、he gross sampleto the size desired for the intended test portion. The test portionmay not be homogeneous.3.2 Test Method BBlending of Carbon Black:3.2.1 The gross sample is poured through the riffle samplesplitter a minimum of four times in a specific sequence toprepare a homogeneous test portion. T
12、he black must becross-blended to accomplish a homogeneous portion for test-ing.3.3 Test Method CDrying of Carbon Black:3.3.1 For all test methods listed in Section 2 except: theFines and Attrition (Test Method D 1508), Heating Loss (TestMethods D1509), Pellet Size Distribution (Test MethodD 1511), p
13、H Value (Test Methods D 1512), Pour Density (Test1This practice is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.61 on Carbon BlackSampling and Statistical Analysis.Current edition approved July 1, 2008. Published September 2008. Ori
14、ginallyapproved in 1995. Last previous edition approved in 2003 as D 5817 03a.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 on
15、the ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Method D 1513), Sieve Residue (Test Method D 1514), SulfurContent (Test Methods D 1619), and Pellet Hardness (TestMethod D 5230) test methods, the sample must be dried
16、beforetesting begins.NOTE 1Samples that are known to be dry ( 1.0 % moisture) due toprior preparation or production processing may be tested without furtherdrying.4. Significance and Use4.1 Several test methods for carbon black require thereduction in sample size or the blending of the test sample t
17、oreduce the variation of the measured characteristic. Otherfactors being equal, larger samples will tend to be morerepresentative of the total supply. This practice providesprocedures for reducing the large sample obtained from the bagand bulk sampling practices to a convenient size for conductinga
18、number of tests to describe the material and measure itsquality in such a manner that the smaller portion is most likelyto be a representation of the bulk sample. Failure to follow theprocedures in this practice could result in providing a nonrep-resentative sample to be used in subsequent testing.
19、Individualtest methods provide for minimum amounts of material to betested.4.2 Test Method A, Reduction of Sample Size, is typicallyused to obtain an aliquot from a large sample, splitting a blackinto two or more equal portions, or reducing a blended blackfrom Test Method B to a specified sample siz
20、e. The finalsample is always smaller than the original sample and wouldnot be considered to be a “well blended” sample.4.3 Test Method B, Blending of Carbon Black, is typicallyused to prepare a homogeneous sample. The homogeneoussample may be used for several tests (see Note 3) or may bereduced in s
21、ize by Test Method A. The final sample size is thesame as the original.4.4 When a sample is to be blended and reduced, the sampleshould be blended (Test Method B) before reduction (TestMethod A). The blending and reduction must be done beforethe sample is dried (Test Method C).5. Apparatus5.1 Riffle
22、 Sample Splitter3Riffle type sample splitters shallhave an even number of equal width chutes, but not less thana total of twelve, that discharge alternately to each side of thesplitter. The chutes shall be 1.3 cm (12 in.) or less in width. Thesplitter shall be equipped with two receptacles to hold t
23、he twohalves of the sample following splitting. It shall also beequipped with a hopper or straight-edged pan that has a widthequal to or slightly less than the overall width of the assemblyof chutes, by which the sample may be fed at a controlled rateto the chutes. The splitter and accessory equipme
24、nt shall be sodesigned that the sample will flow smoothly without restrictionor loss of material (Fig. 1).5.2 Oven, gravity-convection type, capable of temperatureregulation of within 61C at 125C and temperature unifor-mity within 65C.5.3 Desiccator.6. Sampling6.1 Samples shall be taken in accordanc
25、e with PracticeD 1799 or Practice D 1900.7. Procedure7.1 Test Method AReduction in Sample Size (Fig. 2):7.1.1 Place two empty pans under the riffle sample splitter.7.1.2 Pour the gross sample through the riffle samplesplitter.NOTE 2The gross sample is poured into the hopper and uniformlydistributed
26、from edge to edge, so that when it is introduced into the chutes,approximately equal amounts will flow through each chute. The rate atwhich the sample is introduced shall be such as to allow free flowingthrough the chutes into the receptacles below (Fig. 1).7.1.3 Remove one of the pans from under th
27、e riffle samplesplitter and replace with an empty pan. Pour the carbon blackfrom the pan that was removed into the hopper.7.1.4 Remove the pan from the same side as in 7.1.3 andreplace with an empty pan. Repeat these steps as many times asnecessary until the specified test portion size is obtained.7
28、.1.5 The entire test portion must be used if the originalsample was not previously blended by Test Method B or issubsequently blended by Test Method B.7.2 Test Method BBlending of Gross Sample (Fig. 3):7.2.1 Place two empty pans under the riffle sample splitter.7.2.2 Pour the gross sample through th
29、e riffle sample splitter(see Note 2).7.2.3 Remove one of the pans from under the riffle samplesplitter and replace with an empty pan. Pour the carbon blackfrom the pan that was removed into the hopper.7.2.4 Remove the pan from the opposite side of the riffle andreplace with an empty pan and reintrod
30、uce the riffled black intothe hopper. Repeat these steps until the carbon black has passedthrough the riffle sample splitter a minimum of four times.3Humboldt Cat H-3980 and Tyler Cat S.S. 50 have been found satisfactory.Humboldt Cat H-3980 available from Humboldt Manufacturing Co., 7300 W.Agatite A
31、ve., Norridge, IL 60656. Tyler Cat S.S. 50 available from C-E TylerCombustion Engineering, Inc., 8200 Tyler Blvd., Mentor, OH 44060.NOTE 1May be constructed as either closed or open type.FIG. 1 Riffle Sample SplitterD 5817 03a (2008)27.2.5 Combine the blended black from the two pans in acommon conta
32、iner (see Note 3).NOTE 3Pouring pelleted black tends to segregate the black by size ofthe pellets. Remove test samples in accordance with Test Method A or bydipping.7.3 Test Method CDrying of Carbon Black:7.3.1 Dry an adequate sample of carbon black for 1 h, in agravity-convection oven set at 125C,
33、in an open container ofsuitable dimensions, so that the depth of the black is no morethan 10 mm. Cool to room temperature in a desiccator beforeuse.NOTE 4Process samples taken under conditions where the materialcan reasonably be expected to dry (#0.5 %) or known to be dry fromprevious testing or sam
34、ple preparation do not need to be dried again beforetesting can proceed.8. Keywords8.1 carbon black; pelleted carbon black; reducing andblending carbon blackASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standar
35、d. 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 by the responsible technical committee and must be reviewed
36、 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 receive careful consideration at a meeting of theresponsible t
37、echnical 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 International, 100 Barr Harbor Drive, PO Box C700, West Consho
38、hocken, 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).FIG. 2 Reduction of Sample SizeFIG. 3 Blending of SampleD 5817 03a (2008)3
