Coagulated charcoal - Gyoketsutan

…Coal can be broadly divided into two categories based on its caking ability: non-caking and caking, and caking coal can be further divided into strong and weak caking. In addition, coal with very low caking ability is also called slightly caking, coking, or sticky. In coke production, the volatile content is also important in addition to caking ability, so the two are often combined to make distinctions such as low volatile content strong caking coal, medium volatile content strong caking coal, and high volatile content weak caking coal. …

*Some of the terminology explanations that mention "condensed coal" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…粘結性の点で石炭を二大別すれば〈非粘結炭〉と〈粘結炭〉であり，粘結炭はさらに〈強粘結炭〉と〈弱粘結炭〉とに分類される。そのほかに粘結性がごく低い範囲に対して，〈微粘結炭〉〈凝結炭〉〈粘着炭〉などの呼び方もある。コークス製造には粘結性のほかに揮発分も大きな意味をもっているので，両方を組み合わせて，〈低揮発分強粘結炭〉〈中揮発分強粘結炭〉〈高揮発分弱粘結炭〉などの区別をすることも多い。…

※「凝結炭」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報