Fireclay Bricks

Our fireclay bricks are the IS 8 grades AL-28 to AL-40 (26–42% Al₂O₃); AL-35 and AL-40 are rated to about 1200°C. Under IS 4041, high alumina bricks are those with 45% Al₂O₃ or more; our range runs from AL-45 to HA-90, with service ratings of about 1300°C (AL-45) to 1600°C (HA-70 and above). Fireclay is significantly cheaper and is the right choice for backup linings, boilers and general-duty furnaces. High alumina is needed for working linings exposed to slag, metal or higher temperatures.

Five grades: AL-28, AL-30, AL-32, AL-35 and AL-40. The number broadly tracks Al₂O₃ percentage, from 26% at AL-28 up to 42% at AL-40. AL-40 is the most-supplied grade for general industrial work. All five comply with IS 8 (Indian Standard for fireclay refractories).

IS 8:2013 is the Indian Standard specifying fireclay refractory bricks by chemical composition, refractoriness, cold crushing strength, apparent porosity and dimensions. It defines four classes, Super Duty, High Duty, Medium Duty and Low Duty, based on Al₂O₃ content (40% down to 22%) and PCE (SK 35 down to SK 28). Our AL-28 to AL-40 grades comply with IS 8.

Avoid fireclay in working linings exposed to basic slags (steel converters, EAF, cement burning zone), they will react and fail rapidly. Also avoid them where temperatures consistently exceed the grade rating (about 1200°C for AL-35 and AL-40), in glass contact zones, or in atmospheres with high alkali content. For these, use high alumina, basic, magnesia spinel or fused-cast AZS depending on the duty.

Properly installed fireclay back walls in coal-fired industrial boilers typically run 5–8 years between full relines, with hot-spot patching every 12–18 months. Life depends on coal quality (alkali and chlorine content), boiler load cycling and dry-out discipline at first commissioning. Cycling-heavy boilers will see faster joint deterioration.

Yes, AL-40 and AL-32 are stocked in standard sizes for same-day dispatch from our Delhi warehouse. Larger orders, special shapes or higher Al₂O₃ grades typically dispatch in 2–7 working days. We deliver pan-India and handle full export documentation for GCC, ASEAN and African shipments.