vitrinite type

n
as used in Test Method D5061, reflectance classes of vitrinite which span 0.1 % reflectance intervals.
DISCUSSION — This term is commonly referred to as V-type. For example, V-type 6 includes vitrinite reflectance values from 0.6 through 0.69 %. D5061

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

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