ELBE abrasive wheels are exclusively manufactured using artificially produced abrasives from quality suppliers.

In the case of conventional abrasives, we distinguish between three types that can be used depending on the application:

  • Aluminum oxide
  • Sintered aluminum oxide  
  • Silicon carbide (SiC)

Aluminum oxide

Aluminum oxide is manufactured in an electrochemical fusing process involving calcined alumina or bauxite. The fused metal solidifies into blocks, which are then crushed and milled. On sieving systems, they are then classified into the abrasive grains and grain sizes according to FEPA Standard International.
The properties of the aluminum oxide are basically determined by the content of crystalline aluminum (Al2O3). As the Al2O3 content increases, the aluminous abrasive becomes harder and more brittle, and correspondingly less tough.

The quality groups for aluminum oxide:

  • Standard corundum with approx. 95% Al2O3
  • Semi-friable aluminum oxide with approx. 97-98% Al2O3
  • Aluminum oxide with approx. 99-99.9% Al2O3

The individual aluminum oxide types can be seen in the overview table in the section on grinding raw materials.

Sintered aluminum oxide

Sintered aluminum oxide is characterized by very fine microstructures. These are achieved by sintering very fine crystals manufactured in an electrophoretic process. This microcrystalline structure means that sintered aluminum oxide behaves differently from conventional corundum when used correctly for grinding, since new abrasive edges keep forming to a great extent during grinding.

Silicon carbide

Silicon carbide is also manufactured in an electrochemical process involving high-carbon petroleum coke and silica sand. It is processed into abrasive grains similar to aluminum oxide.
Silicon carbide is harder than corundum, but at the same time much more brittle.
It also comes in different types, which are shown in the raw materials table.

You will find an overview of the CBN and DIA grinding raw materials in the table of super-hard abrasives.