1、Designation: D7724 11 (Reapproved 2016)Standard Test Method forCarbon BlackNon-Dispersible Matter by MechanicalFlushing (NDM)1This standard is issued under the fixed designation D7724; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, 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 test method covers the determination of non-dispersible matter after mechanical water flushing of r
3、egularuntreated carbon blacks. It may not be applicable to oil-treatedcarbon blacks because the oil would prevent proper wetting ofthe black by water.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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、:2D1799 Practice for Carbon BlackSampling PackagedShipmentsD1900 Practice for Carbon BlackSampling Bulk Ship-mentsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.
6、Summary of Test Method3.1 A sample of carbon black is mechanically flushed withwater through a wire-mesh screen of a specified size until allthat remains is a non-dispersible matter of carbon black. Thenon-dispersible matter is dried, weighed, and the amount ofresidue is expressed as mg/kg (ppm) of
7、the original sample.4. Significance and Use4.1 The quantity of non-dispersible matter of carbon blackis important in some molded or extruded products as it mayrelate to the surface appearance of those products. The maxi-mum amount of non dispersible matter and the minimum sizeof the particles to be
8、analyzed in each application is normallydetermined and agreed to between the user and the producer.5. Apparatus5.1 Sieve Apparatus, as shown in Fig. 1.35.2 Balance, with a sensitivity of 0.01 g.5.3 Analytical Balance, with a sensitivity of 0.1 mg.5.4 Oven, gravity-convection type, capable of tempera
9、tureregulation within 61C at 125C and temperature uniformitywithin 65C.5.5 Sieves, diameter 100 mm, of either phosphor bronze orstainless steel.3The sieve shall be in accordance with Specifi-cation E11. The sieve size to be used shall be agreed uponbetween the purchaser and the carbon black manufact
10、ure.5.6 Weighing Dishes.6. Precautions6.1 Install the apparatus as described in the manufacturersinstructions and keep it clean at all times to prevent contami-nation.6.2 Examine the sieves each time they are used to make surethat no cracks or holes have developed.7. Sampling7.1 Samples shall be tak
11、en in accordance with PracticeD1799 or Practice D1900.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.31 on Non-CarbonBlack Components of Carbon Black.Current edition approved June 1, 2016. Published July 2016. Ori
12、ginally approvedin 2011. Last previous edition approved in 2011 as D7724 11. DOI: 10.1520/D7724-11R16.2For 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
13、Document Summary page onthe ASTM website.3The sole source of supply of the apparatus known to the committee at this timeis Krahnen IQS, GmbH, Paffrather Str. 1315, D-51069 Koeln, Germany. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Y
14、our comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Procedure8.1 Prior to each test series adjust the water pressu
15、re to 4006 20 kPa in accordance with the manufacturers instructions.Make sure that only the spraying nozzle is operating whenpressure is adjusted.NOTE 1The pressure will drop when the cleaning nozzles areoperating in addition to the spraying nozzle.8.2 Attach the sieve to the apparatus in accordance
16、 with themanufacturers instructions and push the “flush” button for atleast 5 s. The water is flushed through the nozzles as long as the“flush” button is pushed.8.3 After releasing the “flush” button disassemble the sieveand examine the sieve for particles. If no particles are observedreattach the s
17、ieve.8.4 Weigh 500 6 5 g of the sample into a container andtransfer the sample quantitatively into the cylinder of the testapparatus. Note the correct weight for the calculation of thenon dispersible matter.8.5 Press the “start” button and close the lid slowly whilethe spraying nozzle is rotating wi
18、thout any water flushing. Theflushing process will start automatically.8.6 Based on a predefined program the sample will beflushed through the sieve by the water spray nozzles. Fordetails refer to Fig. 1.8.7 A vacuum is applied periodically to keep the nondispersible particles immobilized on the sie
19、ve in order to washdispersible product from the non dispersible matter. Thevacuum application is also part of the automated process.8.8 The end of the test is indicated by a vacuum applicationwithout any water flowing. After that the measurement stops.8.9 Disassemble the sieve and dry in an oven at
20、a tempera-ture of 125C for 1 h.8.10 Quantitatively transfer the non dispersible matter to atared weighing dish and weigh to the nearest 0.1 mg using theanalytical balance.9. Calculation9.1 Calculate the non-dispersible matter to the nearestmg/kg (ppm) as follows:R 5 W/S! 3106(1)where:R = Non-dispers
21、ible matter (NDM), mg/kg (ppm),W = mass of sieve residue, g, andS = mass of sample, g.10. Report10.1 Report the following information:10.1.1 Proper identification of the sample,10.1.2 Identification of the sieve size, and10.1.3 Result of the determination reported to the nearestmg/kg (ppm).11. Preci
22、sion and Bias11.1 Precision and bias statements have not been generated.12. Keywords12.1 carbon black; non-dispersible matterFIG. 1 Schematic Diagram of NDA Test EquipmentD7724 11 (2016)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any
23、 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 by the responsible technical
24、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 receive careful consideration at
25、 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 International, 100 Barr Harbor D
26、rive, 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). 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:/ 11 (2016)3
