ASTM D2415-98

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An American National Standard
Designation: D 2415 – 98
Standard Test Method for
Ash in Coal Tar and Pitch
This standard is issued under the fixed designation D 2415; 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 5.3 Sieve, U.S. Standard 600-μm (No. 30), conforming to
Specification E 11.
1.1 This test method covers the determination of the ash
content of tar and pitch.
6. Bulk Sampling
1.2 The values stated in SI units are to be regarded as the
6.1 Samples from shipments shall be taken in accordance
standard.
with Practice D 4296 and shall be free of foreign substances.
1.3 This standard does not purport to address all of the
Thoroughly mix the sample immediately before removing a
safety concerns, if any, associated with its use. It is the
representative portion for the determination or for dehydration.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7. Dehydration of Sample
bility of regulatory limitations prior to use.
7.1 Hard Pitch—If the solid bulk sample contains free
2. Referenced Documents water, air-dry a representative portion in a forced draft oven at
50°C.
2.1 ASTM Standards:
7.2 Soft Pitch—If the presence of water is indicated by
D 370 Test Method for Dehydration of Oil-Type Preserva-
2 surface foam on heating, maintain a representative portion of
tives
3 the bulk sample at a temperature between 125 and 150°C in an
D 4296 Practice for Sampling Pitch
open container until the surface is free of foam. Take care not
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
to overheat, and remove heat source immediately when foam
poses
subsides.
3. Summary of Test Method 7.3 Tar—Dehydrate a representative portion of the bulk
sample in accordance with Test Method D 370, but stop the
3.1 The sample is carefully volatilized and burned in a
distillation when the temperature reaches 170°C. Separate any
muffle furnace or by other suitable means, after which the
oil from the water which has distilled over (if crystals are
carbonaceous residue is completely oxidized and the remaining
present, warm sufficiently to ensure their solution), and thor-
ash stabilized at 900°C in the muffle furnace.
oughly mix the oil with the residual tar in the still after the
4. Significance and Use
latter has cooled to a moderate temperature.
4.1 This test method determines the amount of inorganic
8. Preparation of Working Sample
matter in the sample.
8.1 Hard Pitch—If the pitch can be crushed at room
5. Apparatus
temperature, prepare a 20-g working sample by suitable
crushing, mixing, and quartering of a representative portion of
5.1 Muffle Furnace—A muffle furnace with good air circu-
the dry sample. The crushing can be done with a small jaw
lation and capable of having its temperature regulated at 9006
crusher and a mullite mortar and pestle. No particle in the
10°C.
representative sample shall be larger than 5 mm in any
5.2 Dish or Crucible, porcelain, silica, or platinum, having
dimension. Crush this sample so that all of it will pass the
a capacity of 35 to 45 mL and a diameter at the top of 55 to 60
600-μm (No. 30) sieve.
mm.
8.2 Soft Pitch—If the pitch is too soft to grind and too sticky
to mix, heat a representative portion of the dry sample to the
This test method is under the jurisdiction of ASTM Committee D-2 on
lowest temperature that will permit passage through the
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
600-μm (No. 30) sieve, taking care to avoid excessive loss of
D02.05.OFon Industrial Pitches.
volatile matter. Do not exceed 10 min for this melting period.
Current edition approved Dec. 10, 1998. Published February 1999. Originally
published as D 2415 – 65 T. Last previous edition D 2415 – 97. Pass the heated sample through the 600-μm sieve to remove
Annu
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