ASTM C561-91(2005)
(Test Method)Standard Test Method for Ash in a Graphite Sample
Standard Test Method for Ash in a Graphite Sample
SIGNIFICANCE AND USE
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.
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.
1.2 This standard does not purport to address all of the safety problems, 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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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:C561–91(Reapproved 2005)
Standard Test Method for
Ash in a Graphite Sample
This standard is issued under the fixed designation C561; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope crucibles, and (2) the possible chemical combination of trace
elements with the ceramic crucible.
1.1 This test method provides a practical determination for
4.2 Any ash or trace elements introduced to the sample will
the ash content in a graphite sample.
influence results. Contamination can occur during drilling to
1.2 This standard does not purport to address all of the
obtain the sample and during pulverization. (See 6.1.)
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 Alumina Ceramic or Platinum Crucible or Dish, suit-
bility of regulatory limitations prior to use.
able for holding sample (subsequently called sample holder).
2. Referenced Documents 5.2 Analytical Balance, capable of weighing to 60.0002 g.
2 5.3 Muffle Furnace, capable of reaching 950°C (1742°F)
2.1 ASTM Standards:
with controller capable of maintaining a temperature of 950° 6
C562 Test Method for Moisture in a Graphite Sample
20°C (1742 6 68°F).
3. Significance and Use
5.4 Platinum or Stainless Steel Wire.
5.5 Desiccator, charged with indicating desiccant.
3.1 This test method provides a practical estimate of non-
5.6 Drying Oven, air convection type, capable of being
burnableresiduesincommerciallyavailablegraphitematerials.
controlled to 110 6 2°C (230 6 4°F).
The ash values determined by this test method are of use in
comparing the relative purity of various grades of graphite. To
6. Sampling
facilitate use, this test method institutes simplifications that
6.1 Samples may be solid or particulate. Solid bodies may
preclude the ability to determine absolutely the ash values of
be sampled by removing one or more solid pieces from the
the test graphite material due to uncontrolled sources of trace
body by, for example, sawing, turning, milling, or fracturing.
contamination.
Particulate samples may be generated from solid bodies by
3.2 This test method is not intended for use in determining
drilling, using a carbide drill to minimize contamination, or by
the ash content of purified graphites, for example, nuclear
other crushing and grinding methods.
materials. The relationship between the mineral content of a
graphite sample and the ash content of that sample is unknown
7. Procedure
and is not determined by the application of this test method.
7.1 Dry the sample in accordance with Test Method C562,
4. Interferences or for a minimum of 16 h in a drying oven at 110 6 2°C (230
6 4°F), and allow the sample to cool to room temperature in
4.1 Although permitted within the scope of this test method,
the desiccator.
the use of alumina ceramic crucibles may affect results due to
7.2 Tareadriedsampleholderusingananalyticalbalanceto
difficulties in obtaining repeatable or proper weights, or both,
60.002 g. As soon as the sample has cooled to room
because of (1) the hygroscopic nature of some ceramic
temperature, remove it from the desiccator and weigh a 25- to
50-g sample into the tared sample holder. Reweigh the sample
This test method is under the jurisdiction of ASTM Committee D02 on
and sample holder to 60.002 g.
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
7.3 Introduce a slow stream of air into the muffle furnace
D02.F0 on Manufactured Carbon and Graphite Products.
(Note 1). Place the sample holder containing the sample into
Current edition approved June 1, 2005. Published Augus
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