Types of Abrasives

Many kinds of materials can be used for flaps, including neoprene, buff cloth and cardboard. The most common materials used in flap wheels, however, are woven and non-woven abrasives. Flap wheel abrasives are natural or artificial crystals.

Natural abrasives include:

  • Diamond
  • Corundum
  • Garnet
  • Quartz
  • Softer Materials Found in the Earth

Artificial abrasives include:

  • Synthetic Diamond
  • Silicon Carbide
  • Aluminum Oxide
  • Boron Carbide
  • Various Aluminas

Silicon Carbide (SiC), also known as Cystolon is a fused hard synthetic crystalline abrasive, often gray or black. On the Mohs Scale of Hardness, SiC is 9.5 and tends to fracture under pressure, presenting a new sharp edge to the workpiece. This characteristic causes SiC to be fast-cutting and well-suited to many ferrous materials.

Aluminum Oxide (Al2O3), also known as ALUNDUM®, is a fused hard synthetic crystalline abrasive often tan or red. On the Mohs Scale, Al2O3 is 9.0, and its hard crystalline structure tends to dull slowly and is hard to fracture.