Castable Refractory Cement in Delhi NCR: 2026 Buyer's Guide

What Is a Castable Refractory Cement?

A refractory castable is a dry mix of calcined alumina or fireclay aggregate, calcium aluminate cement binder and chemical additives. Add water on site, pour or shotcrete into place, let it cure, then dry it out on a controlled heating curve and it becomes a monolithic refractory lining. Castable is the most flexible lining format on the market — it can be poured into almost any geometry, anchored with steel studs and used everywhere from 900 degree boiler shells to 1800 degree reformer furnaces.

The Three Castable Families You Need to Know

Conventional Castables (CC)

Cement content around 15 to 20 percent. Water addition 10 to 15 percent. Easy to work with but high porosity and lower hot strength. Useful for insulating layers, backup linings and low-temperature boiler applications.

Low Cement Castables (LCC)

Cement content 4 to 8 percent. Water addition 5 to 8 percent. Higher density, lower porosity, better hot strength and better slag resistance. The everyday castable for Delhi NCR boiler houses, reheating furnaces, cement cooler floors and induction furnace covers. Most of the castable tonnage we sell in NCR is LCC.

Ultra Low Cement Castables (ULCC)

Cement content below 3 percent. Water addition 4 to 6 percent. Lowest porosity, highest hot strength, highest thermal-shock resistance. Used for aggressive applications like FCC riser sections, petrochemical reformer hot face, aluminium launder covers. Slightly more sensitive to installation quality.

Alumina Content: Which Grade Should You Buy?

Al2O3 %	Typical use zone	Max continuous temp	Common Delhi NCR applications
40 to 45	Low-temp insulating / backup	1200 degC	Boiler backup, duct linings
50 to 60	General hot face	1350 degC	Reheating furnace hearth, ladle cover
70 to 75	Demanding hot face	1550 degC	CFBC bed coil area, cement cooler
80 to 90	Severe thermal / chemical duty	1700 degC	Reformer hot face, induction cover
90 plus (tabular)	Petrochemical / aluminium	1800 degC	FCC unit, aluminium launder

Special Castables Worth Knowing

• Abrasion resistant castable (AR). SiC-bonded or alumina-SiC blend, for CFBC boiler bed coils, coal chutes and ash hoppers. Non-negotiable in power plant applications around Delhi and Noida.
• Insulating castable (IC). Low density (0.8 to 1.4 g/cc), for backup insulation behind hot-face bricks or castable. Reduces shell temperature and saves fuel.
• Non-wetting castable. Treated with fluoride or phosphate additives to resist aluminium penetration. Used in aluminium holding furnaces in Manesar, Gurgaon and Faridabad die-casting plants.
• Self-flowing castable. Pours into place without vibration. Useful for complex shapes and cramped geometries.

Installation: Five Things That Make or Break a Castable Lining

1. Water measurement. Too much water ruins hot strength. Use a calibrated measuring jug, not a plastic bucket guessed by eye. Follow the bag instruction to the litre.
2. Mixer type. High-shear paddle mixer or pan mixer. Do not use a standard concrete mixer for LCC or ULCC.
3. Mix time. 3 to 5 minutes after water addition. Under-mixing gives dry spots, over-mixing destroys workability.
4. Placement window. 20 to 40 minutes from water addition depending on ambient temperature. Hot summer day in Delhi cuts this in half.
5. Curing and dry-out. 24 hours wet curing minimum, then a slow dry-out following the supplier curve. Skipping dry-out causes steam spalling and first-heat failure.

Dry-Out Curve: The Part People Skip

Every castable needs a controlled dry-out because free water and chemically bound water have to leave in the right order. A typical LCC dry-out:

• Ambient to 120 degC at 25 degC per hour, hold 12 hours.
• 120 to 300 degC at 25 degC per hour, hold 12 hours.
• 300 to 550 degC at 35 degC per hour, hold 6 hours.
• 550 to operating temp at 50 degC per hour.

Thicker sections and ULCC grades need slower curves. Ask your supplier for the exact dry-out schedule matched to the grade and the lining thickness. If you skip the 300 to 550 degC hold on an LCC or ULCC, steam cannot escape fast enough and the hot face spalls within the first few heats.

Castable Pricing Ranges in Delhi NCR, 2026

These are rough landed prices for buyers in Delhi NCR as of April 2026. Actual quotes will vary with order quantity, lead time and documentation requirements. The ranges are useful only as a sanity check against quotes you receive.

Grade family	Typical price range (INR/kg)	Notes
CC 40 to 50% Al2O3	35 to 55	Insulating / backup
LCC 50 to 60% Al2O3	50 to 75	General hot face
LCC 70% Al2O3	75 to 110	Demanding hot face
ULCC 80% plus Al2O3	110 to 170	Petrochem / aluminium
Abrasion resistant (SiC bonded)	120 to 220	CFBC boilers
Non-wetting (aluminium)	140 to 240	Holding furnaces

If a quote is significantly below these ranges for the same grade and same brand, ask to see the MTC and sieve analysis before you commit.

Where to Buy in Delhi NCR

For most Delhi NCR buyers, an authorised dealer of a major castable brand (CUMI, Calderys, Mahakoshal, IFGL) based in Delhi will give the right combination of price, stock availability and engineering support. Shanker Agencies is one such dealer and maintains stock of LCC 60, LCC 70 and AR grades in our Shahdara warehouse for same-day dispatch to Delhi, Noida, Greater Noida, Gurgaon, Manesar, Faridabad, Ghaziabad, Sonipat and Panipat. For ULCC and specialty grades, typical lead time is 1 to 3 weeks from the factory.

Short Buyer's Checklist

1. Nail down the alumina percentage and cement class (CC, LCC, ULCC) you actually need. Do not over-spec.
2. Confirm aggregate type: bauxite, tabular alumina, white fused alumina, SiC mix.
3. Ask for MTC with chemistry, bulk density, cold crushing strength and permanent linear change.
4. Ask for the recommended dry-out curve in writing.
5. Confirm shelf life on the bag. Castable ages — 12 months is typical from manufacture date.
6. For large linings, ask the dealer to supervise the first pour and sign off on mixing water and placement technique.

Castable is one of the most forgiving and one of the most unforgiving refractory products in the same bag. Buy the right grade, follow the dry-out curve and you will get lining life numbers that match the technical datasheet. Cut corners on either side and you will be re-lining in six months.