Corundum Mullite Refractory Castable for sale

Corundum mullite refractory castable for sale is the refractory castable, of which Al2O3 is more than 90%. It is made of corundum, dispersant, coagulant, and stainless steel fiber according to a certain formula. It is featured with high temperature strength, wear resistance, high thermal conductivity, good thermal shock resistance, and air tightness. In addition, it cures fast with high strength at the early stage. Corundum mullite castable is widely used in circulating fluidized bed boiler, metallurgy, oil chemical, thermal power, and other areas of the industry.

corundum mullite castable
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Physical and Chemical Index

   Items                               Brands RS-18S(GJ-18S) RS-80MC RS-70MC
Chemical composition (%) ≥ Al2O3+SiO 90 80 70
Bulk density dried (kg/cm3) ≥ 110℃×24h 3000 2900 2750
Cold crushing strength Mpa≥ 110℃×24h 150 100 100
1100℃×3h 160 120 110
1500℃×3h 160 120 110
Cold modules of rupture Mpa≥ 110℃×24h 15 12 10
1100℃×3h 20 14 12
1500℃×3h 20 14 12
Permanent linear change (%) 1100℃×3h ±0.3 ±0.3 ±0.3
1500℃×3h ±0.5 ±0.5 ±0.5
Maximum service temp (℃) 1750 1600 1600
Water addition (%) 4.5-5.0 4.5-5.0 4.5-5.0


It is a kind of refractory materials that takes corundum as aggregate and power, plus boning agent. It is better than high aluminum refractory castable and mullite refractory castable, such as higher mechanical strength and resistance to abrasion. It has the advantages of corundum castable and mullite castable.

The main raw materials of corundum mullite castable is lightweight aluminium oxide aggregate, high quality pure natural mullite ore, and calcium aluminate cement as the bonding agent. It is made through high temperature burning by the advanced industrial furnace.

curundum mollite castable
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Corundum mullite flexural strength and compressive strength increase first and decrease then with the increase of heat treatment temperature. And when alumina micro power content is 5%, the flexural strength reaches to the top.


Corundum mullite refractory castable is featured with uniform expansion, excellent thermal shock resistance, high temperature volume stability, high temperature strength, high refractoriness under load, low high-temperature creep rate, high crushing strength, low linear dimensional change rate, high hardness, good resistance to chemical corrosion, spalling and wear resistance. In addition, such product has advantages of anti-scouring, good chemical resistance performance.

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Because of such characters, it is durable in use and is widely applied in different industrial kiln, high temperature furnace and other key parts of high temperature, such as:

  • Boiler, blast furnace, heating furnace, and hot blast stove;
  • Ceramic tunnel kiln, inclined flue, and cement kiln;
  • Combustion chamber, furnace door, and feed opening;
  • Coal burner, and large power station boiler;
  • Iron making furnaces, steel furnaces, and glass kiln, etc.

About Rongsheng

Zhengzhou Rongsheng Kiln Refractory Co. Ltd, established in the early 90s of twenty century, located in the foot of Mount Song, a place of Xinmi city, which is in the middle of Zhengshao Expressway. The abundant high quality materials and convenient transportation, neighboring the Longhai and Jingguang railway lines, provide favorable conditions for the production of the refractory materials. After 20 years of hardworking and development, it has become a comprehensive enterprise producing refractory materials in metallurgy, building materials, electric power and chemical industry, etc.

There are 160 staffs, including 12 professional technicians. With an annual productivity of 60 thousand ton, it has production lines for the lightweight and heavyweight materials, perfect production examination and testing equipment, including 10 forming presses of 400 to 1000 ton as well as 2 high-temperature tunnel kilns, one is 148 meters long, the other is that of 118.

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Its major business are shaped refractory bricks and unshaped refractory materials.

Shaped Refractory Products

  1. High alumina products: Usually used as the high alumina brick, alumina bubble bricks, and phosphate bonded aluminum bricks, etc. being used in the blast stove, hot blast stove, electric stoves,  and the cement kilns;
  2. Silica refractory products: Hot blast stove, glass kiln, silica brick for coke stove;
  3. Clay refractory products: Clay refractory brick, clay brick for the hot blast stove, alkali proof brick and low porosity clay brick for the cement;
  4. Alkali refractory products: Magnesia brick, magnesium aluminum brick and Magnesium chromium brick;
  5. Special refractory products: Silica mullite brick for cement kiln, wear-resistant refractory product;
  6. Insulation refractory products: High alumina brick, clay brick, diatomaceous earth brick, silica insulation refractory brick, insulation products.

high temperature refractory bricks
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Unshaped Refractory Products

  1. Refractory castable
  2. High alumina cement
  3. Calcined bauxite aggregate , etc.

Strict quality management system: it works according to the standard of ISO9001 from the materials, producing to the testing. Professionals strictly check at every process. Excellent products and services are the top goal.

Professional sales and after-sales service team: they offer consumers the best all-round services in applications, construction and installation, operation and technical training, etc. Rongsheng has established cooperative relations with multiple scientific research institutes, and its products has exported to Japan, Indonesia, Iran, Kazakhstan, Vietnam, etc.

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Rongsheng has always been adhering to the business purpose of honesty, respectful, innovation, dedication. It will persist the strategic developing road based on quality and cheap to establish its own brand. By scientific management, sound customer information management system and abundant products, Rongsheng provides satisfactory, timely, and efficient service to the consumers.

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