CRD-90+ · Al₂O₃ ≥ 95% · 1800 °C
Corundum Refractory Bricks (> 90% Al₂O₃)
Supplier and exporter from Rajkot, India. The apex of the high-alumina ladder — ultra-high-duty refractories for electric arc furnaces, premium glass-tank zones, petrochemical reformers and severe-service reactors.
- Al₂O₃≥ 95%
- Max temp1800 °C
- Bulk density≥ 3.00 g/cm³
- CCS≥ 80 MPa
- RUL T₀.₅≥ 1700 °C
- Lead time4 – 6 wks
About this product
What corundum bricks are — and where they fit
Corundum refractory bricks are ultra-high-alumina refractories with at least 95% Al₂O₃ (aluminium oxide), in which the dominant crystalline phase is α-Al₂O₃ (corundum). They are manufactured from fused, sintered or tabular alumina aggregates with a precisely-controlled grain distribution, pressed and fired to a dense, low-porosity ceramic body. This is the apex of the high-alumina ladder — above the 80 – 90% super-duty tier, and above what most refractory buyers ever need to specify.
What is a corundum refractory brick? It is a fired α-Al₂O₃ ceramic with RUL above 1700 °C, CCS above 80 MPa, bulk density above 3.00 g/cm³ and apparent porosity below 18% — properties no fireclay-bonded or bauxite-bonded refractory can approach. The grade is specified only where peak temperature, slag or process chemistry, or lining-life economics push every cheaper option out of contention.
Compared to 80 – 90% super-duty alumina, corundum delivers roughly 100 °C of additional peak temperature, materially better resistance to alkali, vanadium and sulphur attack, and 50 – 100% longer service life in EAF and reformer duty — at a significant price premium. Compared to AZS specialty refractories, corundum is preferred where slag is acidic-to-neutral; AZS is preferred where the duty is glass-contact at very high temperatures with active alkali.
firebrickssource.com — Agochar Tech LLP — manufactures and exports corundum refractory bricks from Rajkot, Gujarat, India in the standard 230 × 114 × 65 mm size and in custom precast shapes — EAF roof rings, ladle slag-line specials, reformer tube supports, ferroalloy hot-spots — to drawing. Corundum is normally manufactured to order with 4 – 6 week lead time for standard chemistry and 6 – 10 weeks for custom shapes. The grade is regularly supplied to integrated steel mills, hydrogen / methanol / ammonia plants and float-glass operators.
Technical specifications
Full property data — corundum bricks
| Property | Value | Test method |
|---|---|---|
| Al₂O₃ content | ≥ 95 % | IS 1528-7 |
| SiO₂ content | ≤ 1.5 % | IS 1528-7 |
| Fe₂O₃ content | ≤ 0.5 % | IS 1528-7 |
| Apparent porosity | ≤ 18 % | IS 1528-8 / ASTM C20 |
| Bulk density | ≥ 3.00 g/cm³ | IS 1528-12 |
| Cold crushing strength (CCS) | ≥ 80 MPa | IS 1528-4 / ASTM C133 |
| Refractoriness under load (RUL T₀.₅) | ≥ 1700 °C | IS 1528-2 / EN 993-8 |
| Permanent linear change (PLC, 1650°C × 2h) | ± 0.2 % | IS 1528-6 |
| Pyrometric cone equivalent (PCE) | ≥ 40 (Orton) | IS 1528-1 |
| Maximum service temperature | 1800 °C | — |
| Standard size | 230 × 114 × 65 mm | IS 1528 nomenclature |
| Custom shapes | EAF roof rings, slag-line specials, reformer supports — to drawing | — |
| Typical certified values — actual batch values issued on the per-shipment test certificate. Values aligned with IS 1528 / ASTM C-series / EN 993 test methods. | ||
Applications
Where to use corundum refractory bricks
- Electric arc furnace (EAF) lining
- EAF roof centre ring / delta
- Premium glass-tank hot-zone
- Petrochemical hydrogen reformer interior
- Methanol / ammonia reformer reactor
- Ferroalloy submerged-arc furnace hearth
- Steel ladle slag-line (severe service)
- Carbon-black reactor lining
- Ultra-high-duty industrial reactors
- Severe-service hot-spot replacements
Datasheet
Download technical datasheet
PDF with all certified properties, dimensional tolerances and applicable IS / ASTM / EN test methods. Use this for tender attachments and procurement files.
Download CRD datasheet (PDF)Quote request
Get corundum quote in 48 hours
Corundum is manufactured to order. Send your application zone, target Al₂O₃, custom shape drawings (if any) and quantity — we'll quote, send the datasheet and confirm lead time within 48 business hours.
Frequently asked
Corundum — questions buyers ask
What is a corundum refractory brick?
Corundum refractory bricks are ultra-high-alumina refractories with ≥ 95% Al₂O₃ content, in which the dominant crystalline phase is α-Al₂O₃ (corundum). They are manufactured from fused, sintered or tabular alumina aggregates fired to a dense ceramic body — the apex of the high-alumina ladder.
What is the maximum temperature for corundum bricks?
Corundum refractory bricks have a refractoriness under load (RUL T₀.₅) of approximately 1700 °C — the highest of any common high-alumina grade — and a maximum service temperature of around 1800 °C, depending on the specific application and slag chemistry.
Where are corundum refractory bricks used?
Typical applications include electric arc furnace (EAF) lining, premium glass-tank zones, petrochemical reformers (hydrogen, methanol, ammonia), ultra-high-duty industrial reactors and severe-service hot-spots in metals and ferroalloy production.
When should I choose corundum over 80 – 90% super-duty alumina?
Move from HA-80/90 to corundum when peak temperatures exceed 1700 °C, when slag or process chemistry is unusually aggressive (alkali, vanadium, sulphur), or when lining life is the deciding economic factor. Corundum carries a significant price premium but is the only practical solution for the most severe-service zones.
What is the standard size of corundum bricks?
The standard rectangular size is 230 × 114 × 65 mm. Corundum is most commonly supplied in custom precast shapes — EAF roof rings, ladle slag-line specials, reformer tube supports — to drawing.
What is the typical lead time for corundum orders?
Corundum is manufactured to order. Typical lead time is 4 – 6 weeks for standard chemistry and stock shapes; 6 – 10 weeks for custom precast shapes. Trial samples are normally available from existing stock.
What Incoterms are offered for export shipments?
We typically quote FOB Mundra or FOB Kandla. CIF, CFR and EXW are available on request. Sea-freight rates are confirmed at the time of booking.
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