SEPP

Our aluminium oxide series SEPP for precision polishing has a very high purity ( min. 99.98% aluminium oxide). By changing the parameters during the calcinations process well-graded alpha and gamma products are achieved. It has proved to be an advantage that, compared to other products, the SEPP series is free of agglomerates. In case of existing agglomerates after calcinations the SEPP products

are so-called agglomerate-free products. Agglomerates that are present after the calcination process are broken up using a special process, so that the precision aluminum oxides of the SEPP series are extremely fineness and a carefully controlled, narrow grain size distribution.

Technical Data

SEPP 1.0 SEPP 0.3 SEPP 0.05
Crystal shape hexagonal hexagonal kubisch
Crystal structure Alpha Alpha Gamma
Hardness (acc. Mohs) 9 9 8
pH (in distilled water) 7 - 8 7 - 8 7 - 8
Particle size distribution (sedigraph)
d20 (μ) 0,35 0,2 0,1
d50 (μ) 0,6 0,4 0,3
d90 (μ) 1,4 1 0,8

Chemical Structure

SEPP polishes are available in three different grades of purity whereas our standard product contains 99.98% aluminium oxide. The following impurities can occur:

element Share in ppm element Share in ppm
Fe 2 K 22
Na 13 Ca 3
Si 13 Mg, Ti, Cr, Mn < 1 (each)
Ni, Cu, Zn < 1 (each)

If higher purity is requested please contact us.

Applications

Our SEPP Precision Aluminum Oxides are extremely well-suited to polishes that demand the highest quality. The individual particles, a high degree of deagglomeration as well as the special and extremely precisely controlled hardness of the material lead to almost absolute scratch resistance of the surface. Below are a few key areas where our SEPP Precision Aluminum Oxides are used:

  • Infrared optics, silicon, germanium, cadmium sulfide
  • Single crystal materials
  • Fiber optics
  • Soft Materials, Aluminum, Lead, Copper
  • Hardmetal Alloys
  • Cast Iron
  • Alloys
  • ferrite
  • Precision Ball Bearing

packaging

1 kg container
5 kg container