E & E / Thermal Management & TIM/GAP Filler / 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.




Aluminium Oxide is a white powdery material,

Al2O3 has good electrical insulating properties while having relatively high thermal conductive properties (36 Wm−1K−1), furthermore characterised by:


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 Location: Yeonmu (KR)

Application: Megasil SA products improves the heat-conductivity of the compound and allows for good flowability

FunctionalityPerformance, Durability

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