High-alumina Brick | 1750°C Thermal Resistance | Slag & Abrasion Resistant

High Alumina Brick for High-Temperature Furnace & Kiln Linings
48–80% Al₂O₃ grades for industrial furnaces, cement kilns, steel and non-ferrous applications.

• 48–80% Al₂O₃ Grades

• High Temperature & Slag Resistance

• Standard & Custom Shapes

<a href="https://www.zkdrefractories.com/e_contact/">Request a Quote - Ask About Grade Selection</a>

When Do You Need High Alumina Brick?

High alumina bricks are selected when a furnace or kiln lining requires higher refractoriness, mechanical strength and resistance to chemical attack than conventional fire clay bricks.

High Temperature	Mechanical Wear	Chemical Attack	Long-Term Service
For demanding high-temperature furnace and kiln applications	Suitable for areas exposed to abrasion and mechanical stress	Selected where the refractory lining faces slag, alkali or other aggressive conditions.	Higher-grade materials can be considered when longer refractory service life is required.

The highest Al₂O₃ grade is not always the best choice. The right refractory depends on the actual working conditions.

How to Choose the Right High Alumina Brick？

Grade	Al₂O₃	Typical Selection
LZ-48	≥48%	General refractory applications
LZ-55	≥55%	Moderate high-temperature conditions
LZ-65	≥65%	Higher temperature and wear requirements
LZ-75	≥75%	More demanding high-temperature applications
LZ-80	≥80%	High-purity, demanding applications
Grade selection should consider operating temperature, chemical attack, abrasion, mechanical load and the specific furnace or kiln zone.

What Matters When Choosing High Alumina Brick?

Choosing the right refractory is not only about maximum service temperature. The kiln or furnace environment, mechanical conditions and chemical exposure all affect refractory performance.

Operating Temperature	Chemical Attack	Abrasion	Mechanical Load	Thermal Cycling
How hot is the working environment?	What will the refractory come into contact with?	Is the lining exposed to continuous wear?	What mechanical stress will the brick experience?	Will the furnace or kiln frequently heat up and cool down?
Temperature is only one part of refractory selection. The right grade should be evaluated according to the complete working conditions

Not sure which grade you need? → Ask ZKD

High Alumina Brick VS Fire Clay Brick

	High Alumina Brick	Fire Clay Brick
Al₂O₃ Content	≥48%	Lower
Temperature Resistance	Higher	Moderate
Chemical Resistance	Generally higher	Moderate
Mechanical Strength	Generally higher	Moderate
Typical Use	More demanding areas	General furnace & kiln lining
Cost	Higher	More economical
If you are deciding between high alumina brick and fire clay brick, compare the actual working conditions rather than choosing only by price.

Standard & Custom High Alumina Bricks
Available in standard sizes or manufactured according to your drawings and project requirements.

Typical Technical Date

Item	LZ-80	LZ-75	LZ-65	LZ-55	LZ-48
Al₂O₃(%)	≥80	≥75	≥65	≥55	≥48
Refractoriness (°C )	≥1790	≥1790	≥1790	≥1790	≥1790
Bulk Density (g/cm³)	2.65	2.5	2.45	2.4	2.3
Softening Temperature Under Load (°C )	≥1530	≥1520	≥1500	≥1470	≥1420
Reheating Linear changes Rate (%)/1500℃*2h	0.1	0.1	0.1	0.1	0.1
Reheating Linear changes Rate (%)/1450℃*2h	-0.4	-0.	-0.4	-0.4	-0.4
Apparent porosity (%)	≤22	≤23	≤23	≤22	≤22
Cold crushing strength (Mpa)	≥55	≥50	≥45	≥40	≥35
Technical specifications may vary according to grade, raw materials and production requirements. Please contact us for project-specific specifications.

Where Are High Alumina Bricks Used?

High alumina bricks can be used in different high-temperature industries. The suitable grade depends on the equipment, working zone and operating conditions.

Not sure whether high alumina brick is suitable for your application?

Send us your furnace or kiln information for material evaluation.

Custom High Alumina Bricks for Your Project

From standard sizes to special shapes, manufactured according to your drawings and project requirements.

Why Choose ZKD for High Alumina Bricks?

01 Factory Direct

Direct supply from our refractory manufacturing facility.

02 Grade Selection

Select the appropriate Al₂O₃ grade for your application.

03 Custom Manufacturing

Standard and special-shaped bricks made to drawings.

04 Export Supply

Export packaging and documentation for international orders.

FAQ
1.How do I choose the right Al₂O₃ grade for my furnace or kiln?

Grade selection should not be based on temperature alone. Consider the furnace or kiln type, working zone, operating temperature, chemical attack, abrasion, mechanical load and thermal cycling. If you are unsure which grade is suitable, send us your application and operating conditions and we can help evaluate the appropriate specification.

2.When should I choose high alumina brick instead of fire clay brick?

High alumina bricks are generally considered when higher refractoriness, strength or resistance to chemical and mechanical attack is required. Fire clay bricks can be a more economical option for less demanding applications. The better choice depends on the actual working conditions rather than price or temperature alone.

3.Can high alumina bricks be used in cement rotary kilns?

Yes. High alumina bricks can be used in selected areas of cement rotary kiln systems, depending on the kiln design and operating conditions. The appropriate grade and location should be evaluated based on temperature, abrasion, chemical attack and mechanical stress.

4.What information should I provide when requesting high alumina bricks?

Please provide the furnace or kiln type, working zone, operating temperature, required brick size or drawing, estimated quantity and current refractory specification if available. Photos of the existing lining or the refractory failure area can also help us evaluate your requirements.

5.Can you manufacture special-shaped high alumina bricks according to drawings?

Yes. We can manufacture wedge bricks, arch bricks and other special-shaped high alumina bricks according to drawings, dimensions or project requirements. Please send us your drawing or dimensions for specification confirmation before production.

6.What standard sizes of high alumina bricks are available?

We can supply common standard refractory brick sizes, including 230 × 114 × 65 mm, as well as other sizes according to your requirements. Custom dimensions and special shapes can also be manufactured for project applications.

7.Can I order samples before a bulk purchase?

Yes, samples can be discussed for product evaluation before a bulk order. Please provide the required grade, size and application so we can confirm the suitable sample specification.

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