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When the term \"black corundum\" is mentioned, many people may not know what it is. Indeed, this new type of wear-resistant material is not something that ordinary people can use in their daily lives, which is why they are unaware of it. However, it is widely used in industrial manufacturing. Let the editor from Chijia Xinnai Materials give you a detailed introduction! Next, the editor from Chijia Xinnai Materials will explain in his own words what “black corundum” is, its various properties, and why it is so wear-resistant. Please listen to my explanation! First, let’s talk about the items that are polished – smartphone components, floors, walls, wooden parts, plastic parts, and various items used in daily life all require polishing techniques. Polishing gives these items a brighter appearance, making them more attractive and artistic, and it also makes the products seem more valuable, thereby bringing pleasure to users. What would our lives be like if the objects around us lacked luster and had rough edges? Now, let’s turn to “black corundum”. It is a highly wear-resistant new material that serves as a polishing medium; this medium can be used to create tools and abrasives used in the polishing process. It is extremely wear-resistant and represents a material with excellent cost-performance ratios among wear-resistant materials! As for why \"black corundum\" is wear-resistant, let’s first introduce some of its properties that can be found online. The parameters below are taken from Baidu Baike! Color: Black. Crystal system: Triclinic. Hardness (Mohs): ≥9.0. Melting point (°C): 2050. Maximum operating temperature (°C): 1850. True density (g/cm3): ≥3.50. Coefficient of linear expansion (0–1600°C): 7–9. Chemical composition: The main chemical components in percentage are as follows: Al2O3, Fe2O3, SiO2, TiO2. For grade 1: 85–6%, 95–9%, 8–2%, 4–4%. For grade 2: 9% > 8% > 4%. Product characteristics: Black corundum, also known as low-aluminum corundum, is a grayish-black crystalline material obtained by melting bauxite in an electric arc furnace. Its main mineral phases are α-Al2O3 and ferrite spinel. It features a lower Al2O3 content along with a certain amount of Fe2O3 (about 10%), which gives it moderate hardness, high toughness, heat resistance, and stable properties at high temperatures. It is commonly used for free grinding, such as polishing and rough grinding before electroplating of products. It is primarily used for polishing and sandblasting stainless steel, metal products, optical glass, and bamboo and wood products. It is also an innovative abrasive for manufacturing resin grinding wheels, cutting blades, and sandpapers. Since metal is added during production, it results in high hardness; this hardness enables it to collide and rub against other materials. Coupled with the proprietary technologies used in production, these technologies enhance the toughness and wear resistance of \"black corundum\", making it virtually invincible during the polishing process. Of course, to produce high-quality \"black corundum\" products, strong proprietary technologies are essential – only through such technologies can high-quality, wear-resistant products be manufactured!