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Technical Datasheet | Supplied by Toyotsu Chemiplas
ADMAFINE® AO-509 distributed by Toyotsu Chemiplas is an alumina filler. It is in form of microscopic spherical oxide particles. It features excellent dispersibility and easy blend control. It has high purity, high sphericity, non-porous surface, low surface area ratio and narrow particle size distribution. It shows rigidity, low viscosity, wear resistance, dimensional stability and excellent surface roughness. It possesses low heat expansion and high heat conductivity. It contains fewer ionic impurities such as Na, so it is used for high-heat resistant or high-voltage resistant applications. ADMAFINE® AO-509 is recommended for printed circuit boards, epoxy molding compounds and other engineering plastics.
Product Type
Chemical Composition
Physical Form
Particle, Spherical
Product Status
Applications/ Recommended for
  • Epoxy, Epoxide Resin
  • Electronics / Computers > Printed circuit boards
  • Injection molding - thermoplastics
  • Polymer Conversion > Dispersion
  • Mechanical/ physical performance > Dimensional stability

ADMAFINE® AO-509 Properties


Value & Unit
Test Condition
Test Method
Particle Size
10 µm
Surface Area
1.5 m2/g
Alumina Content
> 99.8 %wt

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