70% High-Alumina Refractory Bricks

Supplier and exporter from Rajkot, India. Step-up grade above HA-60 — for cement burning zone back-up, glass tank regenerator hot end and steel ladle back-up linings.

Al₂O₃≥ 70%
Max temp1600 °C
Bulk density≥ 2.50 g/cm³
CCS≥ 55 MPa
RUL T₀.₅≥ 1450 °C
MOQ5 – 10 MT

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About this product

What 70% high-alumina bricks are — and where they fit

70% high-alumina refractory bricks are fired refractory products with a minimum 70% Al₂O₃ (aluminium oxide) content, manufactured from selected calcined bauxite and high-alumina aggregates fired to a dense ceramic body. The grade sits in the upper half of the high-alumina ladder — clearly above the HA-60 workhorse, clearly below the 80 / 90% super-duty grades.

What are 70% high-alumina bricks? They are bauxite-bonded fired refractories whose distinguishing properties are RUL above 1450 °C, CCS above 55 MPa and bulk density above 2.50 g/cm³. The grade was developed for service zones where peak temperature, slag chemistry or load-bearing creep have pushed HA-60 past its useful life — typically cement kiln burning zone back-up, glass tank regenerator hot end and the back-up layer of steel ladles.

Compared to 60% alumina, HA-70 delivers roughly 100 °C of additional peak temperature, better slag resistance and noticeably higher cold crushing strength — at a modest premium that buyers typically recover through extended lining life. Compared to 80 – 90% super-duty, HA-70 gives up about 100 °C of peak temperature and some abrasion resistance, but at materially lower cost — which keeps it the most-specified premium-tier high-alumina grade.

firebrickssource.com — Agochar Tech LLP — manufactures and exports the 70% grade from Rajkot, Gujarat, India in the standard 230 × 114 × 65 mm size, plus arch / wedge variants, taper bricks, kiln-specific shapes and custom precast components to drawing. The grade is regularly supplied to cement plants in the Middle East and Africa, to glass tanks in Southeast Asia and to steel mills replacing 60% back-up with the higher-duty grade.

Technical specifications

Full property data — 70% high-alumina bricks

70% High-Alumina Refractory Bricks — certified property values
Property	Value	Test method
Al₂O₃ content	≥ 70 %	IS 1528-7
SiO₂ content	≤ 25 %	IS 1528-7
Fe₂O₃ content	≤ 1.5 %	IS 1528-7
Apparent porosity	≤ 22 %	IS 1528-8 / ASTM C20
Bulk density	≥ 2.50 g/cm³	IS 1528-12
Cold crushing strength (CCS)	≥ 55 MPa	IS 1528-4 / ASTM C133
Refractoriness under load (RUL T₀.₅)	≥ 1450 °C	IS 1528-2 / EN 993-8
Permanent linear change (PLC, 1500°C × 2h)	± 0.4 %	IS 1528-6
Pyrometric cone equivalent (PCE)	≥ 37 (Orton)	IS 1528-1
Maximum service temperature	1600 °C	—
Standard size	230 × 114 × 65 mm	IS 1528 nomenclature
Custom sizes	Available on request — arch, wedge, taper, precast	—
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 70% high-alumina bricks

Cement kiln burning zone (back-up)
Glass tank regenerator hot end
Steel ladle back-up (behind slag-line)
Electric arc furnace roof
Reheating furnace hot-face
Walking-beam furnace skid rails
Petrochemical reformer hot-zone
Carbon-baking furnace partition walls
Aluminium / copper holding furnaces
Sulphur recovery hot-zone

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 HA-70 datasheet (PDF)

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Frequently asked

HA-70 — questions buyers ask

What are 70% high-alumina refractory bricks?

70% high-alumina bricks are fired refractory products with a minimum 70% Al₂O₃ content, manufactured from selected calcined bauxite and high-alumina aggregates. They sit above the 60% workhorse grade and below 80 / 90% super-duty grades — chosen where peak temperature and slag resistance exceed what HA-60 can handle.

What is the maximum temperature for 70% high-alumina bricks?

70% high-alumina refractory bricks have a refractoriness under load (RUL T₀.₅) of approximately 1450 °C and a maximum service temperature of around 1600 °C, depending on the specific application, slag chemistry and thermal cycling.

Where are 70% Al₂O₃ refractory bricks used?

Typical applications include cement kiln burning zone (back-up), glass tank regenerator hot end, steel ladle back-up, electric arc furnace roof and reheating furnace hot-face — wherever HA-60 falls short of the required peak temperature or slag resistance.

When should I move from 60% to 70% alumina?

Move from HA-60 to HA-70 when peak temperatures consistently exceed 1500 °C, when slag chemistry is more aggressive (cement burning zone, glass hot end), or when load-bearing creep at temperature is shortening HA-60 lining life. The price step is modest and the service-life gain is typically 30 – 50%.

What is the standard size of 70% alumina bricks?

The standard rectangular size is 230 × 114 × 65 mm. Custom sizes, arch and wedge shapes, taper bricks, kiln-specific shapes and precast components are available on request.

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.

Do you provide samples and test certificates?

Yes. Samples can be dispatched on request, normally chargeable. Every batch is tested for apparent porosity, bulk density, cold crushing strength, RUL and Al₂O₃ content; a test certificate ships with each consignment.