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ASTM D7633-10

(Test Method)

Standard Test Method for Carbon BlackCARBON CONTENT

Standard Test Method for Carbon Black<char: emdash>CARBON CONTENT

SIGNIFICANCE AND USE
The total carbon content of a carbon black is a requirement for the calculation and reporting of carbon dioxide emissions. It can also be used in calculations to estimate yield of the process.
SCOPE
1.1 This test method covers the instrumental determination of carbon content in a carbon black sample. Values obtained represent the total carbon content.
1.2 The method is applicable to tread, carcass and specialty type carbon blacks obtained from partial combustion or thermal decomposition processes, which typically contain 95-100 % carbon.  
1.3 The results of these tests can be expressed as mass % carbon.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
14-May-2010
ICS
71.060.10 - Chemical elements
Technical Committee
D24 - Carbon Black
Drafting Committee
D24.66 - Environment, Health, and Safety
Current Stage
Ref Project

Relations

Replaced By
ASTM D7633-10a - Standard Test Method for Carbon Black<char: emdash>CARBON CONTENT
Effective Date
15-Oct-2010
Referred By
ASTM D7662-15(2020) - Standard Test Method for Carbon Content in Carbon Black Feedstock Oils
Effective Date
15-May-2010

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ASTM D7633-10 - Standard Test Method for Carbon Black<char: emdash>CARBON CONTENTASTM D7633-10 - Standard Test Method for Carbon Black<char: emdash>CARBON CONTENT
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D7633–10
Standard Test Method for
Carbon Black—CARBON CONTENT
This standard is issued under the fixed designation D7633; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope magnesium perchlorate. The gas stream is then passed through
a cell in which carbon dioxide concentration is measured by an
1.1 This test method covers the instrumental determination
infrared (IR) absorption detector at a precise wavelength in the
of carbon content in a carbon black sample. Values obtained
IR spectrum.
represent the total carbon content.
3.2 This test method is for use with commercially available
1.2 The method is applicable to tread, carcass and specialty
carbon analyzers equipped to carry out the combustion and
type carbon blacks obtained from partial combustion or ther-
measurement operations automatically.
mal decomposition processes, which typically contain 95-
3.3 The carbon analyzer must be calibrated using an appro-
100 % carbon.
priate calibration standard (see 6.4).
1.3 The results of these tests can be expressed as mass %
carbon.
4. Significance and Use
1.4 The values stated in SI units are to be regarded as
4.1 The total carbon content of a carbon black is a require-
standard. No other units of measurement are included in this
ment for the calculation and reporting of carbon dioxide
standard.
emissions. It can also be used in calculations to estimate yield
1.5 This standard does not purport to address all of the
of the process.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Apparatus
priate safety and health practices and determine the applica-
5.1 Analytical Balance,orequivalent,capableofaweighing
bility of regulatory limitations prior to use.
sensitivity of 1 mg or better resolution.
5.2 Gravity Convection Drying Oven, capable of maintain-
2. Referenced Documents
ing 125 6 5°C.
2.1 ASTM Standards:
5.3 Measurement Apparatus, equipped to automatically
D1799 Practice for Carbon Black—Sampling Packaged
combust the sample and measure carbon content.
Shipments
5.4 Combustion tube and boat made of a suitable material
D1900 Practice for Carbon Black—Sampling Bulk Ship-
such as mullite, porcelain or zircon.
ments
6. Reagents
3. Summary of Test Method
6.1 Purity of Reagents—Reagent grade chemicals shall be
3.1 In this test method, a sample is weighed in a combustion
used in all tests. Unless otherwise indicated, it is intended that
boat and the carbon content is determined by placing the boat
all reagents shall conform to the specifications of the Commit-
in a tube furnace operating at 1350°C in a stream of oxygen
tee onAnalytical Reagents of theAmerican Chemical Society,
resulting in complete combustion. Carbon in the sample is
where such specifications are available. Other grades may be
oxidized to carbon dioxide. Moisture and particulates are
used, provided it is first ascertained that the reagent is of
removed from the gas stream by traps filled with anhydrous
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
6.2 Magnesium Perchlorate.
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
Black and is the direct responsibility of Subcommittee D24.66 on Environment,
6.3 Oxygen, high purity, 99.9 %.
Health, and Safety.
Current edition approved May 15, 2010. Published June 2010. DOI: 10.1520/
D7633-10. “Reagent Chemicals,” American Chemical Society Specifications, American
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Chemical Society, Washington, DC. For suggestions on the testing of reagents not
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM listed by the American Chemical Society, see Analar Standards for Laboratory
Standards volume information, refer to the standard’s Document Summary page on Chemicals, BDH Ltd., Poole, Dorset, U.K. and the Uni
...

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5.1 The greater a carbon black resists compression by having substantial aggregate irregularity and non-sphericity, the greater the compressed volume and void volume. Also, the more that a carbon black resists compression, the greater the energy required to compress the sample per unit void volume.  
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FIG. 1 Block Diagram of Typical Test Apparatus  
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5.1 Thermal diffusivity is an important property required for such purposes as design applications under transient heat flow conditions, determination of safe operating temperature, process control, and quality assurance.  
5.2 The flash method is used to measure values of thermal diffusivity (α) of a wide range of solid materials. It is particularly advantageous because of the simple specimen geometry, small specimen size requirements, rapidity of measurement, and ease of handling materials having a wide range of thermal diffusivity values over a large temperature range with a single apparatus. The short measurement times involved reduce the chances of contamination and change of specimen properties due to exposure to high temperature environments.  
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SCOPE
1.1 This guide covers the determination of the thermal diffusivity of carbons and graphite at temperatures up to 500 °C. It is applicable only to small easily fabricated specimens. Thermal diffusivity values in the range from 0.04 cm2/s to 2.0 cm2/s are readily measurable by this guide; however, for the reason outlined in Section 7, for materials outside this range this guide may not be applicable.  
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4.1 This test method provides a practical estimate of nonburnable residues in commercially available graphite materials. The ash values determined by this test method are of use in comparing the relative purity of various grades of graphite. To facilitate use, this test method institutes simplifications that preclude the ability to determine absolutely the ash values of the test graphite material due to uncontrolled sources of trace contamination.  
4.2 This test method is not intended for use in determining the ash content of purified graphites, for example, nuclear materials. The relationship between the mineral content of a graphite sample and the ash content of that sample is unknown and is not determined by the application of this test method.
SCOPE
1.1 This test method provides a practical determination for the ash content in a graphite sample.  
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