ASTM C838-96(2001)
(Test Method)Standard Test Method for Bulk Density of As-Manufactured Carbon and Graphite Shapes
Standard Test Method for Bulk Density of As-Manufactured Carbon and Graphite Shapes
SCOPE
1.1 This test method covers the determination of the density of as-manufactured carbon and graphite from measurements of mass and dimensions at room temperature.
1.2 This test method is applicable to boronated carbon and graphite.
1.3 This test method is not applicable to carbon- and graphite-containing materials that are thermally unstable at or below temperatures of 200°C.
1.4 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.
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An American National Standard
Designation:C 838–96 (Reapproved 2001)
Standard Test Method for
Bulk Density of As-Manufactured Carbon and Graphite
Shapes
This standard is issued under the fixed designation C 838; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Test Specimens
1.1 This test method covers the determination of the density 5.1 Logs or Blocks—May be measured and weighed as-
of as-manufactured carbon and graphite from measurements of manufactured or after rough ends have been squared by
mass and dimensions at room temperature. machining. The stock shall preferably have been indoors after
1.2 This test method is applicable to boronated carbon and heattreatment;ifthereisdoubtthatthepieceisdry,weigh,dry,
graphite. and reweigh it. Repeat, if necessary, until there is less than
1.3 This test method is not applicable to carbon- and 0.1 % weight loss. The drying temperature should be from 110
graphite-containing materials that are thermally unstable at or to 200°C.
below temperatures of 200°C. 5.2 Shaped Articles—Other than right circular cylinders or
1.4 This standard does not purport to address all of the rectangular parallelepipeds may be measured, and a correction
safety concerns, if any, associated with its use. It is the made for the cavities or protuberances if the specimen volume
responsibility of the user of this standard to establish appro- can be determined within 0.5 % (see 6.2).
priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 Logs or Blocks—Measure as-manufactured on the di-
2. Referenced Documents
ameter or cross section at two different locations, taking care to
2.1 ASTM Standards: avoid distortions. Take four length measurements on cylinders
C 559 Test Method for Bulk Density by Physical Measure- 90° apart on the periphery of the circular end faces. On
ments of Manufactured Carbon and Graphite Articles rectangular pieces, make four length measurements, two each
along opposite faces. Make additional measurements, if
3. Terminology
needed, to determine a valid mean for each dimension. Make
3.1 Definitions of Terms Specific to This Standard: dimensional and mass measurements with equipment accurate
3.1.1 bulk density, n—the mass of a unit volume including
to 0.5 %.
both permeable and impermeable voids (and boron compounds 6.2 Shaped Articles—Make dimensional and mass measure-
in the case of boronated carbon or boronated graphite) present
ments with equipment accurate to 0.5 %.
in the material at room temperature.
7. Calculation
4. Significance and Use
7.1 Calculate the bulk density as follows:
4.1 This test method provides a means of determining bulk
M
D 5
density on as-manufactured logs, blocks, or shaped articles.
V
4.2 This test method is suitable for manufacturing control
and acceptance specifications.
where:
4.3 Test Method C 559 may be used when a higher degree
of accuracy is required.
D = density, kg/m ,
M = mass, kg, and
This test method is under the jurisdiction of Committee D02 on Petroleum V = volume, m .
Products and Lubricants and is the direct responsibility of Subcommittee D02.F on
Manufactured Carbon and Graphite Products
Current edition approv
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