Dense High Alumina Bricks

D marks a dense grade and SD a super-dense grade. A dense brick is pressed and fired to lower apparent porosity and higher cold crushing strength than a standard brick of the same alumina content. The prefix follows our alumina rule: AL- for grades below 60% Al₂O₃ and HA- from 60% upward, so AL-45D is a dense 45% alumina brick and HA-80SD a super-dense 80% brick.

Choose a dense grade where slag, metal, alkali vapour or gas would penetrate an open-pored brick: coke ovens, blast furnaces, reducing-atmosphere rotary kilns and glass furnaces, refineries and steel ladles. Lower porosity slows penetration and the higher strength resists abrasion and load. For backup linings or general-duty furnaces, a standard fireclay or high alumina grade is usually enough and costs less.

Per our partner Crown Ceramics: AL-42D and AL-45D for coke ovens and blast furnaces; HA-62D for blast furnaces, coke ovens, calcination and ceramic kilns; HA-70SD for rotary kilns and glass furnaces in a reducing atmosphere; HA-80SD for refineries, petrochemical furnaces and steel ladles. Send us your operating temperature, atmosphere and slag conditions and we will confirm the grade.