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Spherical Alumina Powders for Thermal Conductive
Fillers
AdValue Technology supplies spherical alumina powders designed for use as thermally
conductive fillers in polymer-based materials. With high thermal stability, electrical
insulation, chemical resistance, and good flowability, spherical alumina is a cost-
effective filler choice for applications requiring improved heat dissipation while
maintaining electrical insulation.
Compared with irregular alumina powders, spherical alumina offers better flowability,
higher packing density, lower viscosity increase, and improved processability at high
filler loading.
Our spherical alumina powders are available in different particle size ranges and purity
levels to support various formulation requirements, including thermal conductivity,
viscosity control, surface finish, filler loading, and processing method.
Key Features of Spherical Alumina Powders:
- Good thermal conductivity
- Excellent electrical insulation
- High thermal stability
- Good chemical resistance
- Spherical morphology for improved flowability
- Suitable for high filler loading
- Lower viscosity increases compared with irregular particles
- Cost-effective alternative to other higher-cost fillers
Applications of Spherical Alumina Powders
- Thermal Interface Materials — TIMs: Used in thermally conductive pads, gap fillers, greases, gels, and phase-change materials to help transfer heat from electronic components to heat sinks or housings
- Thermally Conductive Adhesives: Used in epoxy, silicone, and polyurethane adhesive systems where both heat transfer and electrical insulation are required
- Potting and Encapsulation Compounds: Used in electronic potting materials to improve thermal dissipation while protecting components from moisture, vibration, and environmental exposure
- Thermally Conductive Plastics: Used in thermoplastic and thermoset compounds for electronic housings, LED components, battery parts, and heat- dissipating structural components
- Silicone Rubber and Elastomers: Used in silicone pads, molded rubber components, and flexible thermal management materials
- LED and Power Electronics Packaging: Used in materials for LED lighting, power modules, inverters, converters, and other heat-generating electronic assemblies
- EV Battery and Energy Storage Applications: Used in thermally conductive potting, encapsulation, gap filling, and insulation materials for battery modules and energy storage systems
Grades Available of Spherical Alumina Powders
| Grade |
SP-2 |
SP-5 |
SP-10 |
SP-20 |
SP-45 |
SP-73 |
| D50 Particle Size (µm) |
2.0±0.2 |
5.0±0.5 |
10±0.5 |
20±1.0 |
45±3 |
73±3 |
| Conductivity (µS/cm) |
<10 |
<10 |
<10 |
<10 |
<10 |
<10 |
| Moisture Content (%) |
<0.10 |
<0.10 |
<0.10 |
<0.10 |
<0.10 |
<0.10 |
| True Density (g/cm³) |
>3.70 |
>3.70 |
>3.70 |
>3.70 |
>3.70 |
>3.70 |
| Sphericity (%) |
≥95 |
≥95 |
≥95 |
≥95 |
≥95 |
≥95 |
| Specific Surface Area (m²/g) |
<1.5 |
<0.5 |
<0.3 |
<0.2 |
<0.1 |
<0.07 |
| Chemical Component % |
| Al2O3 (%) |
>99.80 |
>99.80 |
>99.80 |
>99.80 |
>99.80 |
>99.80 |
| SiO2 (%) |
<0.05 |
<0.05 |
<0.05 |
<0.05 |
<0.05 |
<0.05 |
| Fe2O3 (%) |
<0.02 |
<0.02 |
<0.02 |
<0.02 |
<0.02 |
<0.02 |
| Na2O (%) |
<0.03 |
<0.03 |
<0.03 |
<0.03 |
<0.03 |
<0.03 |
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Additional Grades Available of Spherical Alumina Powders
- Larger particle size Spherical alumina powders available in selected mesh range
- Custom cutoff size options available to meet specific formulation and processing requirements
- Specialty spherical alumina powders with higher thermal conductivity
- Spherical alumina powders with higher sphericity to meet specific formulation requirements
Please feel free to contact us to discuss your application and request a quote.
