Term: polygranular carbon https://doi.org/10.1351/goldbook.P04730 Definition: A carbon material composed of grains, which can be clearly distinguished by means of optical microscopy. Note: 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@. Related Terms: 1) glass-like carbon (http://doi.org/10.1351/goldbook.G02639). 2) carbon fibres (http://doi.org/10.1351/goldbook.C00831). 3) pyrolytic carbon (http://doi.org/10.1351/goldbook.P04963). 4) agranular carbon (http://doi.org/10.1351/goldbook.A00188). 5) carbon material (http://doi.org/10.1351/goldbook.C00841). Source: PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 501 (https://doi.org/10.1351/pac199567030473) Citation: 'polygranular carbon' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04730 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.