Foundry Mullite Sand

Your Professional Foundry Mullite Sand Supplier

After more than 30 years of continuous innovation and development, the company has become a comprehensive enterprise for refractory materials used in metallurgy, power, building materials, chemical industry, glass and other industries.

It mainly produces castable series, plastic series, prefabricated parts, refractory bricks, insulation bricks, aluminum silicate ceramic fibers and other dozens of brands and hundreds of varieties of refractory products, which are sold well in more than 20 provinces, cities and autonomous regions across the country.

Mullite sand powder for casting
Mullite sand powder for casting are high-performance refractory materials widely used in investment casting. They feature high-temperature resistance, low thermal expansion, excellent chemical...
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Why Choose us

Quality Certification

The product has successfully obtained ISO9001 quality management system certification, earning the trust and acclaim of numerous users in the highly competitive market environment.

Advanced Equipment

The company's technical center is equipped with a variety of experimental and testing facilities for refractory raw materials and products, including a fully automatic dilatometer, flat plate thermal conductivity meter, load-softening tester, thermal shock testing machine, and a reburning test furnace, among others.

Production Capacity

The company operates two fully automated production lines dedicated to unshaped refractory products, with a combined annual output capacity of 100,000 tons.

Parameter

Brand/Project	Precision casting surface sand	Precision casting mullite sand and powder
SiO₂%	50～52	50～52
Al₂O₃%	≥43	≥43
Fe₂O₃%	≤1.2	≤1.2
TiO₂%	≤0.6	≤0.6
CaO+MgO%	＜0.5	＜0.5
K₂O+Na₂O%	＜0.4	＜0.4
Refractoriness ℃	≥1730	≥1730
Bulk density g/m³		≥2.45
Burn reduction %1.0.I		≤0.25
Powder content in sand %		0.3
Hardness Mohs	7～8	7～8
PH	6～8	6～8
Granularity	80～120 mesh	10-16 mesh, 16-30 mesh, 30-60 mesh, 200 mesh, 270 mesh, 325 mesh, etc., can be processed according to requirements

Precision Casting Surface Sand, Mullite Sand, Powder

Properties of Mullite Sand

High Thermal Stability
One of the most valuable properties of mullite sand is its exceptional thermal stability. Mullite has a melting point of approximately 1,850°C (3,362°F), making it highly suitable for investment casting processes involving high-temperature molten metals. This thermal resistance ensures that the molds maintain their integrity and shape during the casting process, even when exposed to extreme temperatures.

Low Thermal Expansion
Mullite sand exhibits low thermal expansion, which minimizes mold distortion and cracking during cooling. This characteristic is essential for producing high-precision castings with tight tolerances. The reduced risk of thermal stress allows for the creation of intricate designs and complex geometries, which are often required in industries like aerospace, automotive, and medical device manufacturing.

Excellent Refractoriness
The refractoriness of mullite sand makes it highly resistant to the molten metal’s corrosive effects. This resistance extends the lifespan of the molds and reduces the need for frequent mold replacements, thereby lowering overall production costs in the casting process.

Good Mechanical Strength
Mullite sand offers excellent mechanical strength, which allows it to withstand the physical stresses of the investment casting process. It provides a stable structure for mold formation, ensuring the mold retains its shape and integrity during both pouring and solidification.

Applications of Mullite Sand in Investment Casting

Foundry Applications
In foundry operations, Mullite sand finds extensive use as a casting material due to its heat resistance and low thermal expansion properties. It serves as a molding and core sand in the production of precision castings for automotive parts, aerospace components, and industrial machinery. Mullite sand's ability to withstand high temperatures ensures the integrity of castings during the metal casting process, thereby enhancing the quality and reliability of the final products.

Refractory Industry
Within the refractory industry, Mullite sand plays a crucial role in manufacturing refractory bricks, crucibles, and kiln furniture. Its high refractoriness and resistance to chemical corrosion make it an ideal material for lining furnaces, kilns, and other high-temperature equipment used in industries such as steelmaking, glass production, and petrochemical processing. Mullite-based refractories offer superior thermal insulation and mechanical strength, prolonging the lifespan of industrial furnaces and reducing downtime for maintenance.

Ceramics Manufacturing
In the ceramics sector, Mullite sand is utilized in the production of high-quality ceramic products, including tiles, sanitaryware, and advanced ceramics. Its low thermal expansion coefficient and excellent thermal shock resistance enable the manufacture of durable and dimensionally stable ceramic components, suitable for demanding applications in the aerospace, electronics, and medical industries. Mullite-based ceramics exhibit superior mechanical properties, chemical stability, and resistance to abrasion, making them highly sought after in specialized markets.

Other Applications
Apart from its primary uses in foundries, refractories, and ceramics, Mullite sand finds applications in various other industries. It is employed as a filler material in composites and coatings to enhance thermal and mechanical properties. Additionally, Mullite powder is utilized in investment casting, abrasive blasting, and filtration processes, showcasing its versatility and adaptability across different manufacturing sectors.

Additional Information

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FAQ

Q: What is mullite sand?

A: Mullite is obtained from fusion of high purity sand and alumina in an electric arc furnace. It presents low thermal expansion and high thermal shock resistance that make MUB an excellent material for investment casting and other refractory applications.

Q: What is the difference between foundry sand and silica sand?

A: The main difference between silica sand and foundry sand is that foundry sand contains additives that make it more suitable for metal casting. These additives help to improve the sand's ability to withstand heat, resist erosion, and control the flow of molten metal.

Q: How many times can casting sand be used?

A: All sand is reused several times. To ensure good sand quality, two per cent of the casting sand is replaced with new sand on a daily basis. However, the sand that is replaced does not end up as landfill but will instead be recycled for building and construction projects.

We're well-known as one of the leading foundry mullite sand manufacturers and suppliers in China. Please feel free to buy foundry mullite sand at competitive price from our factory. Contact us for more details.

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