Generally Magnesite is a natural ore of Magnesium carbonate(MgCO3). Our "MAGTHERMO" is Magnesite made from seawater by our special synthetic method.
It is suitable as a thermal conductive filler for plastics.
・High thermal conductivity, small specific gravity.
・Very soft particle with 3.5 in Mohs hardness.
・Unhydrous Magnesium carbonate and applicable to highly heat-resistant engineering plastics because of high heat stability up to 500℃.
・Excellent dispersibility due to fine, uniform particles with small specific surface area.
Composition formula | MgCO3 |
---|---|
Appearance | White powder |
Crystal system | Trigonal |
Specific gravity | 3.04 |
Mohs hardness | 3.5 |
Refractive index | 1.72 |
Decomposition temperature | approx. 500℃ |
Grade | MS-S | MS-L | MS-PS |
---|---|---|---|
Average particle size(μm) | 1.2 | 8.0 | 21.0 |
Specific surface area (BET)(m2/g) | 5.5 | 1.2 | 0.7 |
Bulk density(g/ml) | 0.86 | 0.85 | 1.16 |
MgO(%) | 47.5 | 48.0 | 47.8 |
CaO(%) | 0.36 | 0.27 | 0.09 |
Al2O3(%) | 0.019 | 0.006 | 0.002 |
Fe2O3(%) | 0.02 | 0.01 | 0.001 |
SiO2(%) | 0.14 | 0.04 | 0.01 |
MgCO3 | Al2O3 | |
Electrical resitivity(Ω・cm) | 3.0×1016 | 7.3×1015 |
Relative permattivity | 4.8 | 5.7 |
Ball-shape improves fillability and Spindle shape improves physical properties.