Fire Clay Brick Manufacturer | Refractory Fire Bricks for Furnace, Kiln & Pizza Oven

Fire Clay Brick for Furnaces, Kilns & General High-Temperature Applications

Cost-effective refractory bricks with 30–45% Al₂O₃ grades for general furnace and kiln linings.

• SK30–SK35 Grades

• Good Thermal Shock Resistance

• Standard & Custom Sizes
<a href="https://www.zkdrefractories.com/e_contact/">[Request a Quote-Ask About Grade Selection]</a>

When Is Fire Clay Brick the Right Choice?

Fire clay bricks are a practical choice for many furnace and kiln linings where reliable refractory performance is required without the need for higher-grade alumina materials.

General High-Temperature Service	Thermal Shock Resistance	Cost-Effective	Stable Performance
Suitable for many conventional furnace and kiln lining applications.	Suitable for applications exposed to repeated heating and cooling.	A practical alternative when higher-grade refractory materials are not necessary.	Good mechanical and structural stability under suitable operating conditions.

The most expensive refractory is not always the best choice. The right material depends on the actual working conditions.

Fire Clay Brick or High Alumina Brick?

Both materials can be used for high-temperature applications, but they are designed for different levels of service requirements.

Which One Should You Choose?

If your application involves severe abrasion, chemical attack, high mechanical load or demanding thermal conditions, a higher-grade refractory may be more suitable. For general furnace and kiln applications, fire clay brick can provide a more economical solution.

Not sure which material is right for your application?

<a href="https://www.zkdrefractories.com/e_contact/">▶ [Ask Our Technical Team]</a>

<a href="https://zkdrefractories.com/e_products/High-Alumina-Brick-6-28.html">▶ [View High Alumina Bricks →]</a>

How to Choose the Right Fire Clay Brick Grade?

Grade	Al₂O₃	RUL @ 0.2 MPa	Typical Selection
SK30	≥30%	≥1250°C	General refractory applications
SK32	≥35%	≥1300°C	Higher-duty applications
SK34	≥38%	≥1360°C	More demanding conditions
SK35	≥45%	≥1420°C	Higher-grade fire clay applications
These grades should not be selected by temperature alone. Consider the complete operating conditions before choosing a refractory grade.

Key Performance of Fire Clay Bricks

Designed for reliable performance in general furnace and kiln applications.
🌡High-Temperature Stability

Stable performance under suitable high-temperature operating conditions.

↕ Thermal Shock Resistance

Designed to withstand repeated heating and cooling in suitable applications.

⚗ Chemical Resistance

Suitable for applications with moderate chemical exposure, depending on operating conditions.

◈ Volume Stability

Maintains dimensional stability under appropriate firing and service conditions.

⚙ Mechanical Strength

Provides sufficient strength for many general furnace and kiln lining applications.

💰 Cost-Effective

A practical refractory solution when premium-grade materials are not required.

Where Are Fire Clay Bricks Used?

Fire clay bricks are used in a wide range of general-duty furnace and kiln applications where reliable refractory performance and cost efficiency are required.

Not Sure If Fire Clay Brick Is Suitable for Your Application?

<a href="https://www.zkdrefractories.com/e_contact/">[ Ask Our Technical Team ]</a>

What Matters When Choosing Fire Clay Brick?

Operating Temperature	Furnace or Kiln Type	Abrasion	Chemical Exposure	Thermal Cycling
What is the actual working temperature?	What equipment will the brick be installed in?	Will the lining experience continuous wear?	Will the brick contact slag, alkalis or other aggressive materials?	Will the lining experience frequent heating and cooling?

Temperature is only one part of refractory selection.

Not sure which grade is suitable? <a href="https://www.zkdrefractories.com/e_contact/">Ask ZKD →</a>

Standard & Custom Fire Clay Bricks

Available in standard sizes or manufactured according to your drawings and project requirements.

Have a drawing or existing brick sample? Send it to us for specification confirmation.

<a href="https://www.zkdrefractories.com/e_contact/">[ Send Your Drawing ]</a>

Technical Data of Fire Clay Bricks

Item	SK-30	SK-32	SK-34	SK-35
Al₂O₃% (≥)	30	35	38	45
Fe₂O₃% (≤)	2.5	2.5	2	2
Refractoriness(SK)	30	32	34	35
Refractoriness underload, 0.2MPa, °C (≥)	1250	1300	1360	1420
Apparent porosity (%)	20~26	20~24	20~22	18~20
Bulk density (g/cm³)	1.9~2.0	1.95~2.1	2.1~2.2	2.15~2.22
Cold crushing strength ,MPa (≥)	40	45	45	40

Production Process
Raw Material → Crushing → Mixing → Pressing → Drying → High Temperature Firing → Inspection → Packing

FAQ:

What is the difference between SK30, SK32, SK34 and SK35 fire clay bricks?

The main difference is their Al₂O₃ content and refractory performance. Higher grades are generally selected for more demanding applications.

How do I choose the right fire clay brick grade?

Grade selection depends on the operating temperature, furnace type, abrasion, chemical exposure and mechanical conditions. Send us your application details and we can help recommend a suitable grade.

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

Fire clay brick is a more economical choice for many general-duty applications. High alumina brick is generally preferred when higher thermal, chemical or mechanical performance is required.

Can fire clay bricks be used in cement kilns?

Yes, in selected areas depending on the operating conditions. More demanding kiln zones may require specialized refractory materials.

Are fire clay bricks suitable for pizza ovens and fireplaces?

Yes. Suitable fire clay brick grades can be used for pizza ovens, fireplaces and other general heat-resistant applications.

Can you manufacture custom-shaped fire clay bricks?

Yes. We can manufacture wedge, arch, key and other special-shaped bricks according to your drawings or dimensions.

What standard sizes are available?

A common size is 230 × 114 × 65 mm. Other standard sizes and custom dimensions are available upon request.