The Difference Between White, Black, and Brown Fused Alumina

corundum

Fused Alumina is widely used in industry as a common wear-resistant and refractory material.Fused alumina is classified into three types: white alumina, black alumina, and brown alumina. Each is named after its colour, but what are the differences between them? Is it just the colour? Let’s delve into the distinctions among these three types of Fused Alumina.

Composition of corundum

Differences:

Composition:

White Fused Alumina is primarily made of aluminium oxide (Al2O3), typically containing more than 99% aluminium oxide, with small amounts of iron oxide, sodium oxide, and potassium oxide.

Black Fused Alumina contains 95%-98% aluminium oxide and a small number of iron oxides, formed through high-temperature melting.

Brown Fused Alumina usually has around 95% aluminium oxide but contains more iron oxides and impurities such as silicon and titanium.
Composition of corundum

Colour:

White Fused Alumina is pure white, brown Fused Alumina ranges from brown-black to brown-red, and black Fused Alumina is black with a metallic sheen.

Hardness:

Hardness is an important characteristic of Fused Alumina. The hardest is white-fused alumina, followed by brown-fused alumina, and the least hard is black-fused alumina.

Application Fields:

White Fused Alumina is mainly used in high-quality grinding tools and as refractory material in high-temperature industrial furnaces.

Brown Fused Alumina is used in the manufacture of grinding wheels, sandpaper, and abrasive wheels, as well as refractory materials like firebricks and refractory cement.

Black Fused Alumina is often used for heavy grinding and polishing, such as surface treatment of metal parts. In certain special refractory materials, the addition of black Fused Alumina can enhance thermal shock resistance and mechanical strength.

Applications of corundum

How to Choose the Right Fused Alumina?

The choice of Fused Alumina mainly depends on your specific needs, including the type of material to be ground, the hardness of the workpiece, the required precision, and cost considerations. Here are some guiding suggestions:

Consider the material and hardness of the workpiece:

For cutting and grinding hard materials, white Fused Alumina is a good choice due to its higher hardness and purity. For softer materials or applications requiring higher toughness, Brown Fused Alumina is a suitable option.

Consider the precision and surface finish of grinding:

If high precision and surface finish are required, white Fused Alumina is more suitable due to its higher purity. For general grinding work, brown or black Fused Alumina is usually sufficient.

Consider cost-effectiveness:

In terms of cost, brown Fused Alumina is generally cheaper in the market compared to white and black Fused Alumina. If cost is a consideration, brown fused alumina has a greater cost-performance ratio.

Understand the differences between white, black, and brown fused alumina before deciding which is best for your needs. Please contact us immediately. As a leading manufacturer in the fused Alumina industry, we can provide you with more information.

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