| abstract |
The invention relates to a coarse ceramic, refractory product of at least one granular refractory material, wherein an open porosity between 22 and 45 vol .-%, in particular between 23 and 29 vol .-%, and a grain structure of the refractory material, wherein the middle grain content with Grain sizes between 0.1 and 0.5 mm 10 to 55 wt .-%, in particular 35 to 50 wt .-%, and wherein the remainder of the grain structure flour grain fraction with grain sizes up to 0.1 mm and / or coarse grain fraction with grain sizes above 0 , 5 mm is. |