INSULATING CASTABLES FOR BACKUP AND ENERGY-SAVING LININGS
Lightweight, low-conductivity castables (0.90–1.60 g/cc) for backup insulation, 1250–1800°C
PRODUCT OVERVIEW
Insulating castables are lightweight monolithic refractories, built on perlite, vermiculite, insulating aggregate or bubble alumina rather than dense aggregate, so bulk density and thermal conductivity stay low while service temperature and installed strength are matched to the zone. They sit behind (or in lighter-duty cases, as) the working lining to cut heat loss through the shell, lower cold-face temperature, and reduce the heat stored in the structure, the same job an insulating fire brick does, but monolithic and site-cast to match awkward geometries. Shanker Agencies supplies CUMI's Cumicrete insulating castable range across the full purity/temperature spectrum, from economical perlite-based grades for general backup through to bubble-alumina grades rated to 1800°C for hydrogen-atmosphere and reformer duty.
KEY PROPERTIES
Bulk Density Range
0.90 – 1.60 g/cc across the range (CA 58 1.45 g/cc)
Service Temperature
1250°C (CIP 103) to 1800°C (CA 58)
Installation
Vibratory cast (standard for all grades below)
Water Addition
18 – 60% by weight, grade-dependent
Special Duty
CA 58 low-silica formulation for hydrogen atmospheres
Packing
25–40 kg LDPE-lined HDPE bags, grade-dependent
APPLICATIONS
TECHNICAL SPECIFICATIONS
Swipe table to see all columns
| Grade | Al₂O₃ | SiO₂ | Bulk Density | CCS | Permanent Linear Change | Max Temp | Application | Thermal Cond. |
|---|---|---|---|---|---|---|---|---|
| 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 | 1350°C | General-purpose insulating aggregate castable, balance of strength and insulation | 0.51 W/m·K max @500°C hot face |
| 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 | 1500°C | Higher-temperature insulating castable for hotter backup zones | 0.45 / 0.60 W/m·K @500 / 1000°C hot face |
| CA 58 (CUMI, Bubble Alumina) | 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 | 1800°C | Bubble-alumina, very low silica, highest temperature; hydrogen atmosphere and reformer duty | 1.1 / 1.0 / 0.9 W/m·K @540 / 815 / 1000°C hot face |
* Typical catalog values. Not independently certified, request a technical datasheet to confirm figures for your application.
AVAILABLE GRADES
INSTALLATION NOTES
- 1
Vibratory cast is the standard method for all Cumicrete insulating grades; hand-pack only in confined areas per grade guidance
- 2
Water 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
- 3
Never substitute a dense-castable water ratio for an insulating grade, over-wetting collapses the lightweight aggregate structure and destroys the insulation value
- 4
Cure and dry out on a controlled schedule before first heat-up; trapped moisture in any cast lining risks explosive spalling
- 5
CA 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
WHY BUY FROM SHANKER AGENCIES
Insulating castable selection is a temperature-and-weight trade-off: the lightest, cheapest grade (CIP 103) suits general backup at moderate temperatures, while a hot zone or a reducing atmosphere needs a purpose-built grade like CA 58. Shanker Agencies supplies CUMI's Cumicrete range end to end and will match density, temperature rating and chemistry (not just temperature alone) to your actual zone before you order.
PARTNER BRANDS
FREQUENTLY ASKED QUESTIONS
Insulyte 13 (Ace Calderys) and Tata Incast 13 (TRL Krosaki) are competitor trade names for the same insulating-aggregate-based castable as CUMI's CII 106 M, part of the Cumicrete range we supply as our Insulating Castables line (1250–1800°C depending on grade). See the full cross-reference table above for the complete CIV/CII/CIP range.
QUICK INFORMATION
Max Temperature
1800°C
Category
Unshaped Refractories
Grades Available
4 Standard Grades
Industries Served
Brands We Supply
• CUMI Super Refractories (Cumicrete range)
• Other CIV/CII/CIP grades on enquiry
📦 Quick Delivery
Standard grades in stock, Delhi warehouse. Pan-India delivery in 2–5 days. Same-day dispatch for urgent orders ≤ 2 MT.
MORE IN UNSHAPED REFRACTORIES
Plastic Refractories
Ready-to-use rammable plastic refractory for burner blocks, patching and monolithic linings
Low Cement Castables (LCC)
High-strength castables with 3–5% cement, the industry standard for steel ladles
Ultra Low Cement Castables (ULCC)
Premium monolithics with <1.5% cement for the most demanding high-wear zones
Ramming Mass
Silica, neutral and basic ramming mass for jointless induction furnace linings
READY TO ORDER OR NEED A SAMPLE?
Our engineers can recommend the exact grade for your application. Sample kits available for trials. No minimum order on standard grades.
Available Grades, Insulating Castables
Select a grade to see its full specification, designations and equivalents.
- CIP 103 (CUMI, Perlite-Based)40% min Al₂O₃ · 1250°C
- CII 107 M (CUMI)35% (typical) Al₂O₃ · 1350°C
- Cumicrete HT (CUMI)58% min Al₂O₃ · 1500°C
- CA 58 (CUMI, Bubble Alumina)94% min Al₂O₃ · 1800°C
Need help selecting a grade? Send us your application, operating temperature, dimensions and specification requirements, and our technical team will review the requirement.
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