Quality Certificates
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The raw material obtained by grinding the raw materials thoroughly is fed from the preheater to the rotary kiln and baked at about 1450° C. The rotary kilns used in modern cement production are the largest industrial furnaces in the world with diameters of 4-8 meters and lengths up to 80 meters. Nowadays, the calcined rotary kilns are shortened and their rotational speed has increased.
| Grade | Description |
| Upper and lower section (standard conditions) | |
| SORHK 85 | Fired high alumina brick based on bauxite |
| SORHK 80 CB | Phosphate bonded and fired high alumina brick based on bauxite |
| SORHK 80 | Fired high alumina brick based on bauxite |
| SORHK 60 A | Fired high alumina brick based on andalusite |
| SÖRMASSE HB 85 | Low cement castable based on bauxite |
| SÖRMASSE HB 80/S | Low cement castable based on bauxite |
| SÖRMASSE HB 60 A | Low cement castable based on andalusite |
| SÖR GUN HB 55 SC 5 | Gunning castable based on bauxite, fireclay and silicon carbide |
| Upper and lower section (severe conditions) | |
| SORHK 40 ASC 30 | Fired ASC brick based on andalusite and silicon carbide |
| SORHK 60 ASC 15 | Fired ASC brick based on andalusite and silicon carbide |
| SÖRMASSE HB 40 ASC 30 | Low cement castable based on andalusite and silicon carbide |
| SÖRMASSE HB 50 ASC 10 | Low cement castable based on andalusite and silicon carbide |
| SÖRMASSE HB 80 SC 10 | Low cement castable based on bauxite and silicon carbide |
| SÖR GUN HB 50 ASC 10 | Gunning castable based on andalusite and silicon carbide |
| Burner pipe | |
| SÖRMASSE HB 85 ST SC10 | Low cement castable based on synthetic alumina and silicon carbide |
| SÖRMASSE HB 95 RAST 6 | Medium cement castable based on synthetic and fused alumina |
| Tertiary air duct (TAD) | |
| SORHK 55 A | Fired high alumina brick based on andalusite |
| SORK 45 | Fired fireclay brick |
| SÖR MASSE HB 40 D | Low cement castable based on fireclay |
| SÖR GUN HB 55 SC 5 | Gunning castable based on bauxite, fireclay and silicon carbide |