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1900° Temperature Limit. Used as a backup lining behind other refractories. Low density and very low thermal conductivity. Superior to refractory block insulation because it can conform to a complex shell and fill intricate voids.
2200° Temperature Limit. Lightweight castable with low thermal conductivity and good strength. Good all-around backup material. Used for lightweight panel construction, flue and duct linings and complete monolithic linings where there is little or no abrasion.
2600° Temperature Limit. Meets the demands of severe furnace and boiler environments. Suitable for hot face linings, furnace stacks and flues. High strengths reduce cracking from mechanical abuse or steel shell flexing. Low iron content minimizes destructive CO disintegration attack by reducing furnace atmospheres. Lower water content for placement reduces internal steam pressure during initial heat up.
3000° Temperature Limit. High-alumina, high-temperature, high strength lightweight castable. Exhibits moderate density, excellent strengths, low iron, and relatively low thermal conductivity. Good abrasion resistance.