Showa Denko K.K. has a various unique Thermal Functional Filler. We have a full line-up of Al₂O₃ products.

Alumina (Fine Particle） AS (The shape of roundness) CB (Spherical)	UHP (Fine Particle & Granule）

Thermal Conductivity of Inorganics

Heat dissipation material (sheet, grease, etc.)

Metal base / MC substrate (insullating layers)

EMC

AS - Roundish Alumina

Feature - SEM Images

Representative characteristics of AS

AS-10 AS-20 AS-30 AS-40 AS-50 0 - 1100℃weight loss % 0.05 0.07 0.09 0.13 0.18 SiO2 % 0.05 0.06 0.06 0.06 0.06 Fe203 % 0.04 0.06 0.07 0.06 0.05 Na20 % 0.03 0.03 0.03 0.04 0.03 Na+ ppm 3 3 3 50 3 Cl- ppm 1 1 1 2 1 D50 µm 39 22 18 12 9 Oil absorption ml/100g 11 9 9 7 9 BET Specific surface area m²/g 0.5 0.8 1 1.2 1.9 Electric conductivity µS/cm 3 4 5 31 11 pH - 5.7 5.5 5.4 7.4 5.4 121℃ X 20hr extraction with hot water pH - 6.4 6.2 6 7.7 5.8 Na+ ppm 2 5 5 60 6 Electric conductivity µS/cm 10 10 12 28 16

Particle size distribution

Microtrac HRA

Compound viscosity

Thermal Conductivity

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CB - Spherical Alumina

Feature - SEM Images