Porous ceramic, also called micro-porous ceramic, is a sintered ceramic body deliberately left with 35–40% open, interconnected porosity instead of being fired to full density. LONGYI supplies it in two base materials — porous alumina (Al₂O₃-based, PA series) and porous silicon carbide (SiC-based, PS series) — each graded by pore size from 1 µm up to 100 µm. The pore network lets air pass through the ceramic itself, so it is used mainly as a vacuum chuck and air-bearing material where a working face needs to pull vacuum, or float on air, evenly across its whole surface.

Porous alumina is the Al₂O₃-based (aluminum oxide) member of LONGYI's porous ceramic family — sold as the PA series, from grade PA03 (1–3 µm pore size) up to PA100 (100 µm). It carries 35–40% open porosity, 250–300 GPa modulus of elasticity and 1200–1800 MPa compressive strength, and sits at 10¹³–10¹⁴ Ω·cm volume resistivity — far less conductive than LONGYI's SiC-based PS series — which makes porous alumina the default choice whenever a job does not specifically need static dissipation.

35–40% open porosity across the board. Pore size is selectable by grade: porous alumina (PA series) runs from PA03 at 1–3 µm up to PA100 at 100 µm; porous silicon carbide (PS series) runs from PS03 at 1–3 µm up to PS30 at 30 µm. Finer grades keep thin wafers and glass from printing with visible pore marks; coarser grades trade that fineness for lower flow resistance across a large chuck face.

Start from the electrical requirement. Porous alumina (PA series) sits at 10¹³–10¹⁴ Ω·cm, close to insulating, and is the lower-cost default when the job has no static-dissipative requirement. Porous silicon carbide (PS series) sits at 10⁷ Ω·cm, in the static-dissipative range, so pick it when the chuck also needs to bleed static charge off a wafer or panel. Mechanically the two are close — 250–300 GPa modulus, 1200–2500 MPa compressive strength, 1300 °C (PA) vs 1400–1500 °C (PS) max service temperature — so the choice comes down to electrical behavior, not strength.

Vacuum chucks and wafer work-holding fixtures; porous ceramic air bearings for frictionless, non-contact linear motion; and gas diffusion, filtration and flow-distribution plates. In every case the pore network itself does the work — pulling vacuum evenly across a whole face, floating a table on a thin air film, or passing gas through the ceramic body — rather than relying on machined grooves, ports or O-rings.

Yes. Both the porous alumina (PA) and porous silicon carbide (PS) series are manufactured and machined in-house by LONGYI Precision Technology in Taiwan — not sourced from, or re-sold out of, a mainland China supply chain. LONGYI handles forming, sintering, CNC and grinding under one roof, which is what makes drawing-based OEM and ODM work practical at low volume.