polygranular carbon

A @C00841@ composed of grains, which can be clearly distinguished by means of optical microscopy.
Industrial carbon materials (such as electrodes) are mostly polygranular, but special grades are agranular materials, such as @G02639@, @C00831@ or @P04963@. Such materials are covered by the term @A00188@.
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 501 [Terms] [Paper]