Carborundum is a trade name for silicon carbide, a very hard, abrasive material. It is used in a wide variety of applications, including:

• Abrasives: Carborundum is used in a variety of abrasive products, such as sandpaper, grinding wheels, and polishing compounds.
• Refractories: Carborundum is used in refractories, which are materials that can withstand high temperatures. It is used in the manufacture of furnaces, kilns, and other high-temperature equipment.
• Ceramics: Carborundum is used in the manufacture of ceramics, such as spark plugs, insulators, and grinding wheels.
• Cutting tools: Carborundum is used in the manufacture of cutting tools, such as saw blades, drills, and knives.
• Electronics: Carborundum is used in the manufacture of electronics, such as semiconductors and resistors.
• Other applications: Carborundum is also used in a variety of other applications, such as water filtration, roofing, and cosmetics.

Carborundum is a versatile material with a wide range of uses. It is a valuable tool in many industries and applications.