Controlled-porosity aluminium oxide — engineered open or closed porosity for filtration, support media, gas diffusion and high-thermal-shock service.
Used for: molten-metal filters · catalyst supports · diffusers · refractory linings · insulation · thermal-shock kiln furniture
Porous alumina retains the chemical and thermal benefits of dense Al₂O₃ while introducing controlled open or closed porosity, typically 20–45%. The reduced cross-section lowers stiffness and dramatically improves thermal-shock tolerance — at the cost of strength and gas-tightness.
Compared with dense alumina, porous grades have markedly lower thermal conductivity and elastic modulus, allowing them to tolerate rapid heating and cooling without spalling. Mechanical strength is reduced; chemical resistance is broadly retained.
Porosity is controlled by particle-size grading, partial sintering, sacrificial pore-formers or replication of organic templates. Pore size and distribution are tuned to the end use — fine and tortuous for filtration, coarse and aligned for flow control.
Molten-metal filters and distribution media, catalyst supports for chemical and petrochemical processing, gas diffusers, thermal-shock-resistant kiln furniture, and low-conductivity refractory components.
| Grade | Purity | Max temp | Density | Hardness | Typical use | Find products |
|---|---|---|---|---|---|---|
| EA99P | 99% Al₂O₃ | 1700 °C | 2.8 | — | High-purity porous body for filters, supports and thermal-shock service | → Find products |
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Porous grades excel where thermal shock dominates, or where the part must filter, diffuse or support — anywhere openness is a feature, not a flaw. For sealing, structural load or pressure containment, stay with dense alumina.
Open porosity (volume %), mean pore size and pore-size distribution. Tell us the operating temperature, the fluid or melt being handled and the pressure drop or filtration grade target — we’ll specify accordingly.
Yes — porous alumina filter foams and bonded particle media are widely used for aluminium, copper and ferrous melts, removing oxide inclusions and stabilising flow into the casting cavity.
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Tell us your operating temperature, the chemistry it'll see and any mechanical loads. We'll specify a grade — or recommend an alternative material — and link you directly to matching products.
