CA 58 (CUMI, Bubble Alumina) Insulating Castables

CA 58 (CUMI, Bubble Alumina) is the 94% min Al₂O₃ grade in our insulating castables range, rated to 1800°C. Typical catalogue values: Al₂O₃ content 94% min; SiO₂ content 1.0% max; bulk density 1.45 g/cc max @110°C/24hr; cold crushing strength 90 / 75 / 100 Kg/cm² @110 / 1000 / 1550°C (3hr fired); permanent linear change ±0.2 / ±0.5% @1000 / 1550°C; thermal conductivity 1.1 / 1.0 / 0.9 W/m·K @540 / 815 / 1000°C hot face; max service temperature 1800°C. Confirm the exact figures on the grade datasheet before specifying.

CA 58 (CUMI, Bubble Alumina) carries 94% min Al₂O₃.

CA 58 (CUMI, Bubble Alumina) is typically specified for bubble-alumina, very low silica, highest temperature; hydrogen atmosphere and reformer duty. Applications across the insulating castables range also include backup insulation behind a dense working lining, boiler and furnace casing insulation, reheating and heat treatment furnace roof/wall backup and carbon black reactors, waste heat boilers, sulphur recovery units (CA 58, low-silica/hydrogen duty). Send us your operating conditions and we will confirm the grade.

Cumicrete HT (CUMI): 58% min Al₂O₃, rated to 1500°C. CA 58 (CUMI, Bubble Alumina): 94% min Al₂O₃, rated to 1800°C. Higher alumina generally brings higher refractoriness and slag resistance. Send us your application and operating temperature and we will confirm the grade.

Send your application, operating temperature, lining area and quantity through the quote form, WhatsApp or +91 98999 57888. Same-day dispatch of standard stock items from Delhi; other items are confirmed with the quotation. Pricing is quoted per enquiry.