Rubber / Rubber Silicone / Spherical Alumina

Spherical Alumina

Mineral: Spherical Alumina


Spherical alumina is basically alumina “shaped” in a high temperature fusion process. Spherical alumina therefore has the same intrinsic properties as any other alumina. Its chemical formula is Al2O3.

At Sibelco high purity aluminas are being used to make spherical alumina.


Basic properties

Property Value Unit
Moisture 0.1 [%]
Hardness (Mohs) 9.0 [-]
Al2O3 99.9 [%]
Density 4 [kg/ dm3]
Thermal conductivity  36 (Wm−1K−1)



Name Grade D50
Megasil SA  0020 2.3
0050 5.7
0080 9.3
0380 46
0700 72


Production LocationYeonmu (KR)

Application: Spherical Alumina improves the heat-conductivity of the compound and for liquid rubber compounds helps the flowability.


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