1、Designation: D3493 14D3493 16Standard 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, 2014Jan. 1, 2016. Published December 2014January 2016. Originally approved in 1976. Last previous edition approved in 20132014 asD3493 13.D3493 14. DOI: 10
13、.1520/D3493-14.10.1520/D3493-16.2 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
14、standard 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
15、cases 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-co
16、nvection 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), ap
17、proximately 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
18、the 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 dete
19、rmination.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 D241
20、4, 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 sh
21、all 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 Gu
22、ide 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 de
23、sired 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, Titan, or ISTCO press.3 Each apparatus is to be operated and maintained in accordance with the manufacturers directions for
24、 optimum performance.4 The carbon black press is available from two suppliers: Jaron Technologies, LLC, 2338 Duncan St., Pampa, TX 79065, http:/ ISTCO Engineering Works,K-1. 884/10 ndibutyl phthalate; oil absorption number; paraffin oilASTM International takes no position respecting the validity of
25、any patent rights asserted 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 r
26、evision at any time 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. You
27、r comments will receive 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 copy
28、righted by ASTM International, 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.or
29、g (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:/ 1 SRB8 ITP InformationNumber of Labs (M/H/L)SRB8 Material Grade Producer Test
30、Period D3493SRB-8A N326 Continental March 2008 64 (1/0/0)SRB-8A2 N326 Continental March 2013 72 (0/1/1)SRB-8B N134 Cabot June 2009 66 (0/0/0)SRB-8B2 N134 Cabot March/April 2014 40 (3/4/3)SRB-8C HS Tread Columbian September 2010 66 (2/1/0)SRB-8D LS Carcass Cabot March 2009 67 (0/2/0)SRB-8E N660 Orion
31、 September 2008 57 (1/0/0)SRB-8F N683 Orion March 2010 67 (1/1/0)SRB-8F2 N683 Orion March 2015 62 (1/0/0)SRB-8GA N990 Cancarb Last half of 1996 UnknownA Precision data SRB-8G was produced and approved in Table 1 was obtained with DBP oil.ASTM taskforce studies with paraffin oil have shown similar pr
32、ecision as DBPoil. Future precision studies will include paraffin oil such that similar data will become available.the last half of 1996 as SRB-5G and has continued to be included in thecurrent SRB sets since that time.At the time it was produced and approved it was D24s practice to only publish the
33、 within-laboratory standard deviation, Sr, and associatedlimits. The between-laboratory standard deviation, SR, was never published and since the data is no longer available it is not possible to calculate or publish the SR valuesand corresponding limits. The SRB G material was only tested for NSA, STSA, and OAN per the test method version available in 1996.D3493 165
