sparking fuels

n
within the context of Test Method D3175, fuels that do not yield a coherent cake as residue in the volatile matter determination but do evolve gaseous products at a rate sufficient to mechanically carry solid particles out of the crucible when heated at the standard rate. Such coals normally include all low-rank noncaking coals and lignites but may also include those anthracites, semianthracites, bituminous, chars, and cokes that lose solid particles as described above. These are defined as sparking fuels because particles escaping at the higher temperatures may become incandescent and spark as they are emitted.

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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