Fire Clay Brick

Your Professional Clay Refractory Brick Supplier！

Zinfon Refractory Technology Co.,Ltd is a comprehensive enterprise integrating R&D, design, production, sales, and service, and is one of the world's large-scale production bases for magnesium refractory materials. the products cover all kinds of alumina refractories, including: high alumina series, mullite series, siliceous series, phosphate series, lightweight heat preservation series and other stereotyped products; castables, self-flowing materials, malleable materials, prefabricated blocks and other non-stereotyped products, as well as all kinds of refractory raw materials and chemical products.

Fireclay Brick
Fireclay or clay bricks are made from clay (including materials like shale and coal gangue) as the main raw material, processed through mixing, forming, drying, and firing.
● Good...
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Low-porosity Clay Brick
Low-porosity clay bricks are made from low-alumina mullite as the main raw material, formed under high pressure and sintered at high temperatures.

● Low porosity with good...
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Low-creep Clay Brick
Low-creep clay refractory bricks are made from high-quality raw materials with minimal impurities, such as dense and pure fused corundum, andalusite, and kyanite.

● High load...
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Why Choose Us

Rich Experience

With more than 20 years of experience, the company has its own R&D team and has supplied products to many traders.

Production Capacity

We have invested in two production lines equipped with 120-meter ultra-high-temperature tunnel kilns and a fully automatic crushing and grinding workshop for raw materials. With more than 100 employees, we achieve an annual output of 100,000 tons of various refractory products.

Our Qualification

We have passed through ISO9001, ISO14001, ISO45001 cerifications, as well as other national and local qualificaitons, such as Reliable Quality & Service Certification and Enterprises Credit Eveluation Cerfitification.

Clay Refractory Brick - Overview

Clay refractory bricks, also known as fire bricks, are a type of ceramic brick designed to withstand high temperatures and are commonly used in the construction of furnaces, kilns, and other heat-intensive applications. They are made from fireclay, a type of clay that can withstand high temperatures without melting or deforming. These bricks offer excellent thermal insulation, mechanical strength, and chemical resistance.

Product Specification

We provide the following product specifications:

Grade / Specifications		DN-12	DN-14	DN-17	SK-34	SK-33	SK-32
Refractoriness (SK)		35	34	34	34	33	32
Apparent Porosity (%)		13	14	17	23	24	26
Bulk Density (g/cm3)		2.40	2.34	2.25	2.20	2.15	2.00
Cold Crushing Strength (MPa)		70	65	50	35	30	20
Thermal Linear Expansion(%) @1000deg		0.5	0.6	0.6	0.6	0.6	0.6
Reheating Linear Change(%) @1400deg x2hrs		±0.1	±0.2	±0.2	±0.3	±0.5	±0.5
Refractoriness under Load ºC @0.2MPa		1,500	1,470	1,430	1,350	1,300	1,250
Chemical Composition (%)	Al2O3	45	45	42	40	38	35
Chemical Composition (%)	Fe2O3	1.3	1.5	1.7	2.0	2.2	3.0

Product features

High Refractoriness

Capable of withstanding service temperatures up to 1,760°C (3,200°F), suitable for most non-ferrous and ferrous applications.

Excellent Thermal Shock Resistance

Fire clay bricks can endure rapid changes in temperature without cracking, making them ideal for furnaces that undergo frequent cycling.

Mechanical Strength

High compressive strength ensures the bricks maintain integrity under heavy load and thermal stress.

Low Thermal Conductivity

Helps reduce heat loss and improve energy efficiency in industrial settings.

Chemical Resistance

Resistant to acidic and neutral slags, some grades can also withstand mild alkaline environments.

Dimensional Stability

Retain shape and structure even at elevated temperatures, reducing maintenance frequency.

Application of Clay Refractory Brick

Iron and steel industry

In iron and steel production, clay refractory bricks are mainly used as lining materials for blast furnaces, hot stoves, ladles, hot metal ladles and other equipment. Because of its high refractoriness and corrosion resistance, high alumina clay brick is often used in key parts of blast furnace, such as furnace bottom and hearth. Ordinary clay bricks are used in checker bricks, vaults and other parts of hot blast stoves. Clay refractory bricks can withstand the erosion of high-temperature molten iron and slag, and at the same time resist the erosion of high-temperature airflow, providing reliable protection for steel production equipment.

Building materials industry

In cement production, clay refractory bricks are widely used in the lining of cement rotary kiln, preheater, calciner and other equipment. Its corrosion resistance and wear resistance can effectively resist the chemical erosion of cement clinker and the wear of materials, and prolong the service life of kiln lining. In addition, clay refractory bricks are also used in the breast wall, crown and other parts of glass melting furnace, which can withstand the high temperature erosion of glass liquid and the erosion of air flow.

Energy industry

In the field of energy, clay refractory bricks are used for lining of coke ovens, boilers, garbage incinerators and other equipment. Its high temperature resistance and corrosion resistance can withstand the heat and chemical erosion caused by high temperature fuel combustion, and at the same time resist the wear of acid gas and ash in flue gas. The application of clay refractory bricks not only improves the operation efficiency of energy equipment, but also reduces the maintenance cost and downtime of equipment.

Civil field

In addition to industrial applications, clay refractory bricks are also widely used in civil fields, such as home fireplaces, pizza oven and outdoor ovens. Its good high temperature resistance and thermal shock resistance can ensure the safety and stability of the furnace body in the long-term use process, and its beautiful appearance and good thermal insulation performance also add a comfort and warmth to family life.

Process of Clay Refractory Brick

01.

Raw Material Processing

Kaolin or clay ore is crushed and finely ground (particle size <2 mm); some raw materials may require pre-calcination.

02.

Batching and Mixing

Clinker and bonding clay are proportionally mixed (typically 70%–85% clinker and 15%–30% bonding clay) and blended with water.

03.

Molding

Machine-pressed under 100–200 MPa; high-pressure molding is used for high-density bricks.

04.

Drying and Sintering

Drying: 100–150°C
Sintering: 1300–1400°C (high-temperature stage promotes mullite formation).

Composition of Fire Clay

Silica

Silica (SiO2) becomes soft at about 2800℉ and finally fuses and becomes a glassy substance at about 3200℉. It melts around 3300℉. This high softening and melting point has established it as the principal material for the production of refractory bricks.

Alumina

Alumina (Al2O3) has even higher softening and fusion temperature than silica. It melts at about 3800℉. It is, therefore, used in combination with silica.

Lime, Magnesia, Iron oxide and Alkalis

The presence of these detrimental components acts as fluxes to lower the softening and fusion temperature.

Customization Process

Customized dimensions and shapes

Customized Brick Shape: Provide Sample Sheets--Mold Opening & Quotation--Mold Opening & Sample Making--Bulk Production Quotation--Contract Signing--Bulk Production.

Delivery cycle and logistics

Sea freight, land freight. Determine the mode of transportation according to the needs. About 30 days, customized products delivery time depends on the actual situation.

Customized packaging

Customize your brand: Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials. Take your brand to the next level, contact us today to discuss your project!

Certifications

Package & Delivery

Package: Standard export package or Customized Package.
Delivery: By air express, by sea.

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FAQ

Q: How to use refractory bricks?

A: The refractory bricks have a very high melting point and are often made to withstand temperatures in excess of 1000°C (1832°F). This allows them to be used in applications where exposure to heat is long lasting. Even under severe thermal stress, they do not easily crack or deform, hence keeping their shapes intact.

Q: Why do my fire bricks keep cracking?

A: Thermal stress: Rapid changes in temperature, such as when starting a fire or adding too much fuel too quickly, can cause the liner bricks to expand and contract rapidly, leading to cracks.

Q: What are the ingredients in refractory bricks?

A: Refractory bricks contain around 25 to 30% alumina and 60 to 70% of silica. They also contain oxides of magnesium, calcium, and potassium. Refractory bricks find application in the construction of kilns, furnaces, etc. They can withstand temperatures up to 2100 degrees Celsius.

Q: What is your MOQ?

A: 50PCS.

Q: Can I get samples?

A: Of course, we usually provide existing sample for free, however a little sample charge is needed for custom designs. Sampls charge is refundable when order is up to a certain quantity.

Q: How long is the lead time of the samples?

A: For existing samples, it takes 3-5 days.

Q: How long is the production lead time?

A: For some itesm we keep some stock that can be delived in 2 weeks. New poductioin leadtime 60-80 days.

Q: What is your payment term?

A: Discussed! T/T / Alipay /Paypal.

Q: Can I customized my own Brand?

A: Yes we can do however you need to reach certain quantity for each item.

Q: How will you deliver the goods?

A: For some orders with small quanity we can deliver by air or express And for bulk and big quantity we will deliver to any one China adress you want.

As one of the most professional clay refractory brick manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy bulk customized clay refractory brick from our factory. Contact us for sample.

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