Both are dense, shaped refractories for the hot face, and both are made in our own units. The difference lies in alumina content, and with it, how much heat, slag and wear the brick can take.
Fireclay bricks
Made mainly from fireclay, with moderate alumina content. They give good all-round performance and value for general-duty linings such as boilers, chimneys, ovens and back-up layers. Common grades include IS-6, IS-8, SK-36 and SK-38.
High alumina bricks
Contain a higher share of alumina, typically from about 45% up to 85%. More alumina generally brings higher refractoriness, better strength at temperature and better resistance to slag, chemical attack and abrasion, at a higher cost.
How to choose
- Maximum operating temperature and how often it cycles
- Contact with slag, molten metal or aggressive gases
- Abrasion from moving charge or dust-laden gas
- Load on the lining at temperature
- Expected lining life against budget
Over-specifying wastes money; under-specifying shortens lining life. Often the right answer is a combination: high alumina where conditions are harshest and fireclay where they are milder.
Tell us your equipment and operating conditions, and we will suggest the grade and quantity.
Send us the details and get a quick quotation or a site visit.