Unshaped Refractories / Insulating Castables
CA 58 (CUMI, Bubble Alumina) Insulating Castables
CA 58 (CUMI, Bubble Alumina) is the 94% min Al₂O₃ grade in Shanker Agencies’ insulating castables range, rated for continuous service to 1800°C.
CA 58 (CUMI, Bubble Alumina) technical specification
Typical values for CA 58 (CUMI, Bubble Alumina) insulating castables. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.
Where CA 58 (CUMI, Bubble Alumina) is used
Is CA 58 (CUMI, Bubble Alumina) right for your application?
- Rated for continuous service up to 1800°C.
Compare CA 58 (CUMI, Bubble Alumina) with other grades▾
Compare CA 58 (CUMI, Bubble Alumina) against every grade SAPL stocks in this family.
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| Grade | Al₂O₃ content | SiO₂ content | Bulk density | Cold crushing strength | Plc | Thermal conductivity | Max service temperature | Application |
|---|---|---|---|---|---|---|---|---|
| CIP 103 (CUMI, Perlite-Based) | 40% min | 52% max | 0.90 g/cc max @110°C/48hr | 20 / 10 / 10 Kg/cm² @110 / 1000 / 1200°C (3hr fired) | ±0.5 / ±0.9 / ±1.2% @800 / 1100 / 1300°C | - | 1250°C | Lightest, most economical grade; general backup insulation |
| CII 107 M (CUMI) | 35% (typical) | - | 1.60 g/cc max @110°C/24hr | 90 / 60 / 70 Kg/cm² @110 / 1100 / 1300°C (3hr fired) | ±0.2 / ±1.0% @1100 / 1300°C | 0.51 W/m·K max @500°C hot face | 1350°C | General-purpose insulating aggregate castable, balance of strength and insulation |
| Cumicrete HT (CUMI) | 58% min | - | 1.55 g/cc max @110°C/48hr | 80 / 40 / 50 Kg/cm² @110 / 1100 / 1300°C (3hr fired) | ±0.5 / ±1.5% @800 / 1300°C | 0.45 / 0.60 W/m·K @500 / 1000°C hot face | 1500°C | Higher-temperature insulating castable for hotter backup zones |
| CA 58 (CUMI, Bubble Alumina)this grade | 94% min | 1.0% max | 1.45 g/cc max @110°C/24hr | 90 / 75 / 100 Kg/cm² @110 / 1000 / 1550°C (3hr fired) | ±0.2 / ±0.5% @1000 / 1550°C | 1.1 / 1.0 / 0.9 W/m·K @540 / 815 / 1000°C hot face | 1800°C | Bubble-alumina, very low silica, highest temperature; hydrogen atmosphere and reformer duty |
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How CA 58 (CUMI, Bubble Alumina) is referenced across Indian and export naming conventions.
| SAPL grade code | CA 58 (CUMI, Bubble Alumina) |
| Alumina content | 94% min Al₂O₃ |
| Max service temperature | 1800°C |
Installation notes
- 1Vibratory cast is the standard method for all Cumicrete insulating grades; hand-pack only in confined areas per grade guidance
- 2Water addition varies widely by grade, 18–25% for CA 58 up to 45–60% for CIP 103, always follow the specific grade's datasheet, not a blanket figure
- 3Never substitute a dense-castable water ratio for an insulating grade, over-wetting collapses the lightweight aggregate structure and destroys the insulation value
- 4Cure and dry out on a controlled schedule before first heat-up; trapped moisture in any cast lining risks explosive spalling
- 5CA 58 (low-silica, bubble alumina) is specified where the atmosphere is hydrogen or strongly reducing, do not substitute a standard-silica grade in that duty
Disclaimer: values are typical and compiled by Shanker Agencies Pvt. Ltd. from standard industry data and published manufacturer specifications. They are indicative, not a guarantee. Confirm the exact grade datasheet before specifying. For a certified datasheet or quotation, contact info@shankeragencies.com or +91 98999 57888.