White corundum use
White corundum is a high-purity abrasive material made from premium aluminum oxide powder. It is produced through an electro-melting and refining process, resulting in a product with excellent self-sharpening properties, resistance to acid and alkali corrosion, and high thermal stability. With a hardness slightly higher than brown corundum but lower toughness, white corundum offers strong grinding performance, low heat generation, and high efficiency. Its unique characteristics make it ideal for grinding materials like high-carbon steel, high-speed steel, and stainless steel.
In addition to its use in grinding tools, white corundum sand is also widely used in precision casting and advanced refractory applications. The product comes in various particle sizes: 0-1mm, 1-3mm, 3-5mm, 5-8mm, and 8-12mm. For fine powder applications, the available grades include 180#-0, 200#-0, and 320#-0. The physical and chemical properties meet strict standards, with Al₂O₃ content exceeding 98.5%, and minimal levels of impurities such as Na₂O, CaO, and magnetic particles.
White corundum is one of the most cost-effective abrasives for both dry and wet processes. It is particularly suitable for finishing rough surfaces where a finer finish is required. Known for its sharp, angular structure, it ranks second only to diamond in hardness and is often preferred in applications where iron contamination must be avoided. It can cut extremely hard materials or be used in spherical forms for highly precise machining, achieving very low surface roughness values.
Manufactured by melting high-quality alumina in an electric arc at temperatures over 2000°C, white corundum undergoes cooling, crushing, shaping, magnetic separation, and sieving to produce a dense, sharp, and angular granular material. This makes it ideal for producing ceramic abrasives, resin-bonded tools, and for use in sandblasting, polishing, and precision casting. It is also used in advanced refractory materials.
The international code "WA" corresponds to global and national standards, and the product is mainly exported, though some is supplied domestically. Particle sizes are available according to international and national specifications, and custom sizes can be produced based on customer requirements. The typical range includes F4 to F320, with varying chemical compositions depending on the grade. One of its key advantages is small crystal size and impact resistance. When processed by a self-grinding machine, the particles tend to be more spherical, making them easier to bind with adhesives.
White corundum is typically used in dry or wet blasting systems powered by compressed air. Due to its high hardness, it wears out quickly on low-quality equipment. Therefore, it is recommended to avoid using tungsten carbide spray guns; instead, boron or silicon carbide nozzles should be used for optimal performance.
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