Address
Building 1, Zone 1, Greenland Binhu International City, Zhengzhou, Henan, China
Work Hours
Monday to Friday: 9AM - 7PM
Weekend: 10AM - 6PM
High Alumina Castable
High Alumina refractory castables are mixed by high quality bauxite, mullite, andalusite or corundum as aggregate, silica Powder, α-alumina powder as micro powder, refractory cement as binder, also some additive to make better performance. Formulas are changed according to different applications.
Comparing to conventional dense castables, high alumina fire castables can be used in the area that have more higher temperature and also have higher cold crushing strength.
Product Description
Description of High Alumina Castable
High-alumina refractory castable is a type of monolithic refractory material made primarily from high-alumina bauxite, mixed with water, and then poured into the container. Its core component is alumina (Al₂O₃), typically ranging from 40% to 90%. The higher the alumina content, the stronger the material’s high-temperature resistance and corrosion resistance.
Material Composition and Key Performance Characteristics
The performance of high-alumina castables depends not only on the alumina content but also on the precise formulation of its components:
The main raw material is high-alumina bauxite, with pure calcium aluminate cement added as a binder to achieve early strength. To optimize performance, active SiO₂ and α-Al₂O₃ micropowders are often introduced to improve flowability and sintering properties. Sometimes, minerals such as kyanite are added to compensate for volume shrinkage at high temperatures, ensuring structural stability.
Based on typical product data, the bulk density of this material is usually above 2.6-2.7 g/cm³, indicating a dense structure; its compressive strength at room temperature can reach over 80-100 MPa, exhibiting high mechanical strength. For example, a castable model LC-160 (Al₂O₃ ≥ 75%) can even achieve a compressive strength exceeding 150 MPa after high-temperature treatment at 1500℃.
Its permanent linear shrinkage rate at high temperatures is typically controlled within ±0.5%, indicating excellent volume stability and resistance to cracking due to shrinkage or expansion. Furthermore, it possesses good thermal shock resistance, abrasion resistance, and corrosion resistance.
Application of High Alumina Castable
High-alumina castables have a wide range of applications, commonly found in key parts of various high-temperature industrial kilns:
- Iron and Steel Metallurgy: Used as linings for blast furnaces, hot blast stoves, heating furnaces, ladles, and tundishes.
- Building Materials Industry: Commonly used lining materials for the precalciner, front and rear kiln openings, and grate coolers in cement rotary kilns.
- Other High-Temperature Equipment: Also widely used in ceramic kilns, boilers, and waste incinerators.
Physical and Chemical Index
| A-45 | A-60 | A-70 | A-75 | A-80 | A-90 | ||
| Dry Density(g/cm3)≥ | 2.3 | 2.5 | 2.6 | 2.65 | 2.7 | 3 | |
| Chemical(%） | Al2O3≥ | 45 | 60 | 70 | 75 | 80 | 90 |
| ZrO2 | - | - | - | - | - | - | |
| Modulus of Rupture(Mpa) | 110°C*24h≥ | 5 | 8 | 9 | 9 | 10 | 12 |
| 1500°C*3h≥ | 8(1350°C) | 10(1450°C*3h) | 12 | 15 | |||
| Compressive Strength(Mpa) | 110°C*24h≥ | 30 | 40 | 40 | 45 | 45 | 60 |
| 1450°C*3h≥ | 60 | 80 | 80 | 85 | 90 | 85 | |
| Linear Dimensional Change After Fired(1500°C*3h)%≤ | ±0.5 | ±0.5 | ±0.5 | ±0.5 | ±0.5 | ±0.5 | |
| 1350°C*3h | 1450°C*3h | 1450°C*3h | 1450°C*3h | 1450°C*3h | 1450°C*3h | ||
| Refractoriness(°C)≥ | 1710 | 1740 | 1790 | 1790 | 1790 | 1790 | |
| Working Temp(°C) | 1450 | 1450 | 1500 | 1550 | 1600 | 1650 | |
Company Profile
About Ruitai Lianxin
Henan Ruitai Lianxin Refractory Materials Co., Ltd is a modern R&D-centered refractories manufacturing enterprise integrated with refractories sales and marketing, furnace engineering construction, recycling and sales of waste refractories as well as refractory raw material, technology and goods import and export, and technical services.
Well-equipped and technologically advanced, ISO/QHSE-certified management underpins a product line of ordinary, medium and high-grade magnesia series brick, magnesia-chrome brick, magnesia-alumina spinel brick, magnesia-alumina- chrome basic brick, lightweight insulation brick, clay brick, high alumina brick, corundum brick, silicon carbide brick and insulation materials, monolithic castable, ramming mix, plastic, etc.
We manufacture more than 70 categories of refractory bricks with more than a thousand specifications and models, which are widely used in high-temperature kiln/furnace, non-ferrous metallurgical smelter, cement lime rotary kiln, glass-melting furnace, electric power, petrochemical hazard waste incinerator etc.
Factory Show
As a 20 refractory brick manufacturer, we have our own factory, professional machinery and equipments, strong technical team, complete delivery process, perfect after-sales service.
Test Equipment
We have innovative technology and advanced experimental equipment to ensure that every product has the best quality and we are responsible for every customer.
Production Process
We have a complete production process, from raw materials to molding, and then to finished products. Each step is operated and inspected by dedicated personnel to ensure the high quality fire bricks.
Raw Materials
Mixing and Tempering
Forming
Drying
Sintering
Selecting
Packing
Shipping
Quality Control
After the refractory bricks are manufactured, we need to undergo professional testing and inspection to ensure that each high-quality fire brick is delivered to the customer, so that the customer can rest assured.
Packaging & Shipping
Our fire bricks are delivered to customers in the shortest possible time by land, sea or air.
Company Advantages
Customer Cases
As a world-renowned exporter, we have expanded our business scope to the world, providing high quality firebricks to customers worldwide. We have gained loyal customers all over the world, reached cooperation again and again, and become the first choice of global customers.
Company Certification
We are a reliable manufacturer and supplier of refractory bricks, with a number of certificates and patents to protect your kiln, and our professional team of experienced engineers and technicians are committed to providing you with excellent service.
Cooperation Partners
As a refractory bricks source manufacturer for 20 years, we use the best materials and the most cutting-edge technology to carefully make fire bricks, our fire bricks have all kinds of types to meet various application needs, has won many reliable cooperation partners.
Questions & Answers
Q1: Could I get a sample before placing an order?
A1: Yes. A sample as per your requirement can be prepared for approval.
Q2:How can I get your prompt quotation?
A2:We can give you reply with quotation quickly if you kindly send the inquiry with following factors: dimension (length*width*thickness), service temperature, application and quantity.
We’d be appreciated if you can also provide the density and content.
Q3: Do you have stocks?
A3: Yes, but only for regular size.
Q4: How do you deliver my orders?
A4: Our experts can recommend you the suitable way based on the quantity and your budget. Normally ,it is by sea.
Q5: I am a big buyer, can I get a competitive price?
A5: Yes, you will get our lowest price without quality compromise along with our professional service.As we are working with mainly players in Europe, Asia, America and Afraic.
Q6: What is your quality control?
A6: 1.Chemical inspection is performed during raw material, production and finished products.
2.Physical test is performed for finished products.
Q7: Are you a manufacture or trader?
A7: We are truly a manufacturer, Ruitai Lianxin not only can provide the high quality refractory bricks with the best price, but also can offer the best pre-sale service and after-service.
Q8: Do you accept size and shape customization? Are the specifications accurate?
A8: Yes! We have a professional R&D team, and advanced QC inspection equipments to ensure the accurate size and shape for you.