Читать книгу Industrial Carbon and Graphite Materials - Группа авторов - Страница 289

The quality of coke is chiefly influenced by the feed material used in the delayed coking units. Of second and third importance are the coking and the calcining conditions. Structure, density, and VCM contents can vary significantly as well as sulfur, metal, and ash content.

Over the last years an international standardization of testing methods for carbon materials has been developed. ISO, EN, DIN, or ASTM specifications or drafts exist for nearly all parameters. We are closer to standardization even in the case of coefficient of thermal expansion (CTE) measurement, which for a long time has relied on test methods of electrode manufacturers. The situation that national standards (ASTM, DIN) are incorporated in the international ISO specifications makes itself positively noticeable.