Aluminum Oxide (Red/Brown)
Aluminum oxide, also known as corundum, is hard and has a high temperature resistance. Due to its hardness, as machining time increases the cubic grain becomes increasingly round and relatively blunt. This process happens fairly quick, resulting in a shorter service life.
Zirconium Corundum/Zirconia (Blue)
Zirconium corundum is very tough and is also extremely temperature resistant. This gives it a very long service life, which in turn minimizes costs. Zirconium corundum has a self-sharpening effect owing to its microcrystalline structure. Due to this structure, during the sanding process small parts break out of the grain again and again. This results in new cutting edges which keep the grain sharp for longer periods. The microcrystalline wear ensures aggressive sanding and lasting sharpness, which in turn extends the entire service life of the abrasive.
Silicon Carbide (Black)
Silicon carbide abrasive grains are wedge shaped and pointed. They are sharp edged and very hard, making them extremely aggressive. Therefore, silicon carbide is used in the wood sector mainly for very coarse grit sanding. In fine sanding, silicon carbide is almost exclusively used for sanding screens. Since silicon carbide is relatively brittle, the individual grains wear away faster than other minerals.
Abrasive dispersion affects the sanding pattern through the cutting and removal process.
The grain is usually applied with an electrostatic scattering process in such a way that the respective tips are all aligned upwards. This ensures a high initial cutting performance. In the production of abrasives, the respective grain size can be dispersed in different densities: open, semi-open or
closed dispersion. Abrasives with an open dispersion achieve a high abrasion rate, but exhibit a certain aggressiveness that can have a negative effect on the sanding pattern. In order to avoid the high, punctuated aggressiveness of the open dispersion and the associated sanding marks, the grains are placed close together on the abrasive. This means that the aggressiveness is no longer localized but instead evenly distributed over the entire abrasive surface.
In order to meet constantly growing customer demands, LÄGLER® prefers closed dispersion in the production of abrasives, especially on medium and finer grits. This ensures optimal aggressiveness while simultaneously leading to a uniform sanding pattern.
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