1、Designation: D3493 13D3493 14Standard Test Method forCarbon BlackOil Absorption Number of CompressedSample (COAN)1This standard is issued under the fixed designation D3493; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f 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 covers the procedure for the mechanical compression of a carbon black sample and the determination
3、ofthe oil absorption number of the compressed sample.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the res
4、ponsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1765 Classification System for Carbon Blacks Used in Rubber ProductsD1799 Practice for Carbon
5、 BlackSampling Packaged ShipmentsD1900 Practice for Carbon BlackSampling Bulk ShipmentsD2414 Test Method for Carbon BlackOil Absorption Number (OAN)D4821 Guide for Carbon BlackValidation of Test Method Precision and BiasD4483 Practice for Evaluating Precision for Test Method Standards in the Rubber
6、and Carbon Black Manufacturing Industries3. Summary of Test Method3.1 A sample of carbon black is compressed four times in a compression cylinder at a pressure of 165 MPa (24 000 psi) andthen tested in an absorptometer to determine the oil absorption number.3.2 n-Dibutyl phthalate, paraffin, or EFA
7、oil is added by means of a constant-rate buret to the compressed sample of carbonblack in the mixer chamber of an absorptometer. As the sample absorbs the oil, the mixture changes from a free-flowing state toone of a semiplastic agglomeration, with an accompanying increase in viscosity. This increas
8、ed viscosity is transmitted to thetorque-sensing system of the absorptometer. When the viscosity of the mixture reaches a predetermined torque level, theabsorptometer and buret will simultaneously shut off. The volume of oil added is read from the direct reading buret. The volumeof oil per unit mass
9、 of carbon black is the oil absorption number. Either DBP, paraffin, or EFA oil is acceptable for use with manystandard pelleted grades of N-series carbon blacks found in Classification D1765. COAN testing using paraffin or EFAoil on somespecialty blacks and powder blacks may result in significant d
10、ifferences when compared to COAN testing using DBP oil. Refereetesting between suppliers and users should use DBP oil until such time that precision data is available for paraffin and EFA oils.4. Significance and Use4.1 The oil absorption number of a carbon black is related to the processing and vul
11、canizate properties of rubber compoundscontaining the carbon black.4.2 The difference between the regular oil absorption number and the oil absorption number of compressed sample is somemeasure of the stability of the structure of the carbon black.1 This test method is under the jurisdiction ofASTM
12、Committee D24 on Carbon Black and is the direct responsibility of Subcommittee D24.11 on Carbon Black Structure.Current edition approved July 1, 2013July 1, 2014. Published August 2013December 2014. Originally approved in 1976. Last previous edition approved in 20092013 asD3493 09.D3493 13. DOI: 10.
13、1520/D3493-13.10.1520/D3493-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM s
14、tandard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all c
15、ases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Apparatus35.1 Balance, analytical, 0.01-g sensitivity.5.2 Oven, gravity-con
16、vection type, capable of maintaining 125C 6 5C.5.3 Carbon Black Press, capable of compressing a 25-g sample to 165 MPa (24 000 psi).45.4 Absorptometer,5equipped with a constant-rate buret that delivers 67 6 0.4 mm3/s (4 6 0.024 cm3/min).5.5 Spatula, rubber, 100 mm.5.6 Sieve, 850 m (U.S. No. 20), app
17、roximately 125-mm (5-in.) diameter with receiver pan.5.7 Brush, approximately 40 mm (1.5 in.), stiff bristle.5.8 Desiccator.6. Reagent and Standards6.1 Purity of ReagentsReagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that allreagents shall conform to t
18、he specifications of the Committee on Analytical Reagents of the American Chemical Society, wheresuch specifications are available.6 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently highpurity to permit its use without lessening the accuracy of the deter
19、mination.6.2 n-Dibutyl Phthalate, having a density of 1.042 to 1.047 mgm3 at 25C and a relative density of 1.045 to 1.050 at 25C.6.3 Paraffn Oil, having a kinematic viscosity of 10 to 34 mm2/s (cSt) at 40C.76.4 Epoxidized Fatty Acid Ester (EFA), meeting the specifications listed in Test Method D2414
20、, Table 1. It is recommended tostore the product at temperatures between 7 and 30C. If stored in sealed original containers, the product is stable for at least 12months. For handling and safety, please refer to safety data sheet.6.5 ASTM D24 Standard Reference Blacks, SRB.87. Sampling7.1 Samples sha
21、ll be taken in accordance with Practices D1799 and D1900.8. Calibration and Standardization8.1 See Test Method D2414.NOTE 1If values are not obtained within the acceptable range, it will be necessary to either vary the pressure of the hydraulic press until acceptablevalues are obtained or follow Gui
22、de D4821.9. Procedure9.1 Dry an adequate sample for 1 h in a specified oven set at 125C. Cool the sample in a desiccator for a minimum of 30 minprior to testing.9.2 Weigh a sample mass of either 25, 30, or 45 g depending on the sample mass requirement for oil absorption per Test MethodD2414. The des
23、ired sample mass to be compressed will weigh 5 6 0.1 g greater than the mass specified in subsection 9.2 of TestMethod D2414.9.3 Compress the sample using either the Chandler Chandler, Titan, or TitanISTCO press.3 Each apparatus is to be operated and maintained in accordance with the manufacturers d
24、irections for optimum performance.4 The sole source of supply of carbon black presses known to the committee at this time is Titan Specialties, Inc., P.O. Box 2316, Pampa, TX 79066-2316. carbon blackpress is available from two suppliers: Jaron Technologies, LLC, 2338 Duncan St., Pampa, TX 79065, htt
25、p:/ ISTCO Engineering Works, K-1. 884/10 ndibutyl phthalate; oil absorption number; paraffin oilASTM 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 determin
26、ation 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 every five years andif not revised, either reapproved or wit
27、hdrawn.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 technical committee, which you may attend. If you feel that you
28、r 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 Conshohocken, PA 19428-2959,United States. Individual reprints (sing
29、le 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 145
