Is Insulcast the same as Cumicrete insulating castable?

Insulcast (OCL) and Refinsul (Sharadaa) are competitor trade names for the same insulating castable specifications as CUMI's Cumicrete CIV/CII/CIP series, which we supply across the full 1250–1800°C range, from economical perlite-based grades to bubble-alumina CA 58 for hydrogen-atmosphere and reformer duty.

Unshaped Refractories

Insulating Castables for Backup and Energy-Saving Linings

Lightweight, low-conductivity castables (0.90–1.60 g/cc) for backup insulation, 1250–1800°C

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35 – 94%Al₂O₃ Content
Up to 1800°CMax Service Temperature
4 GradesStandard Grades

Supplying refractories since 1980
Dispatch from Delhi
Same-day dispatch of standard stock items
Pan-India & export

Available Grades

Need help choosing a grade?

Grades by Al₂O₃ content, 35 – 94% across the range. Open a grade for its full technical specs.

CIP 103 (CUMI, Perlite-Based)

40% min Al₂O₃

Max 1250°C

Full specs

CII 107 M (CUMI)

35% (typical) Al₂O₃

Max 1350°C

Full specs

Cumicrete HT (CUMI)

58% min Al₂O₃

Max 1500°C

Full specs

CA 58 (CUMI, Bubble Alumina)

94% min Al₂O₃

Max 1800°C

Full specs

Need help choosing a grade?

Which Grade for Your Application

Typical grade choices by application. Open a grade for its full specs, or ask us to confirm for your conditions.

Lightest, most economical grade; general backup insulation
CIP 103 (CUMI, Perlite-Based) · 40% min
General-purpose insulating aggregate castable, balance of strength and insulation
CII 107 M (CUMI) · 35% (typical)
Higher-temperature insulating castable for hotter backup zones
Cumicrete HT (CUMI) · 58% min
Bubble-alumina, very low silica, highest temperature; hydrogen atmosphere and reformer duty
CA 58 (CUMI, Bubble Alumina) · 94% min

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.

Industries Served

Steel
Cement
Aluminum
Petrochemical
Foundry

Technical Specifications

Key properties of insulating castables. Values vary by grade and manufacturer.

Property	Typical Value
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

Technical Data Sheet

Chemical analysis, physical properties, test methods and available sizes for Insulating Castables, shared on request.

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Typical catalog values, not independently certified. Open a grade above for its full specification, and confirm the exact grade datasheet before specifying.

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To recommend the right grade for your duty, send us:

Application
Furnace, vessel or zone to line or repair.
Operating temperature
Normal and peak, °C.
Lining area & thickness
Area in m² and thickness in mm.
Installation method
Cast, pump, gun or ram.
Quantity
MT required and schedule.

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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.

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

Not sure which Insulating Castables grade you need?

Send us your application, operating temperature, lining thickness and quantity. Our refractory team will recommend the suitable grade and supply route.

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