REFRACTORY
REFERENCE
Grade comparison tables, castable selection criteria, insulation specs and equipment-specific application guides. Everything a procurement engineer or plant manager needs in one place.
Curated by Rahul Taneja
Director & Refractory Engineering Expert, Shanker Agencies Pvt. Ltd.
35+
Products Covered
7
AL grades documented
6
Castable types
6
Application guides
Firebrick Grade Comparison
AL grades indicate minimum alumina content. Higher alumina = higher temperature resistance, better mechanical strength, and higher cost. Select the grade that meets your operating conditions without over-specifying.
Selection Tip: AL70 vs AL80
AL70 is the most widely used grade for steel ladle working linings, good balance of cost and performance. AL80 is specified for slag lines and safety linings where the higher CCS and refractoriness justify the additional cost. Don't over-specify, AL80 in a general barrel position adds cost without benefit.
| Grade | Name | Al₂O₃ Content | Max Temp | CCS | Density | Applications |
|---|---|---|---|---|---|---|
AL40 | Fireclay Brick | 38-42% | 1400°C | 30-40 MPa | 2.0-2.2 g/cc | General purpose, backup linings, boilers, incinerators |
AL50 | Semi-High Alumina | 48-52% | 1550°C | 40-50 MPa | 2.3-2.4 g/cc | Cement kilns upper zones, incinerators, reheating furnaces |
AL60 | High Alumina 60 | 58-62% | 1650°C | 50-60 MPa | 2.4-2.5 g/cc | Steel ladles, reheating furnaces, rotary kilns |
AL70Popular | High Alumina 70 | 68-72% | 1700°C | 55-65 MPa | 2.6-2.7 g/cc | Steel ladles (working lining), hot metal ladles, rotary kilns |
AL70D | High Alumina 70 Dense | 68-72% | 1700°C | 60-75 MPa | 2.7-2.8 g/cc | High wear areas, blast furnace, severe mechanical stress |
AL80 | High Alumina 80 | 78-82% | 1750°C | 60-70 MPa | 2.8-2.9 g/cc | Severe duty, EAF roofs, torpedo ladles, safety linings |
AL90 | Super High Alumina | 88-92% | 1850°C | 70-80 MPa | 3.0-3.2 g/cc | Specialty applications, flow control, extreme temperature zones |
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