Polished-Surface Al2O3 Ceramic Wafer Chuck Mirror Finish Alumina Vacuum Grade for Semiconductor Processing Equipment

In semiconductor processing, the surface that touches the wafer must be perfect: smooth enough to avoid particle trapping, clean enough to avoid contamination, and stable enough to hold wafers flat at process temperature. Our Polished-Surface Al2O3 Ceramic Wafer Chucks are pressed and sintered from vacuum grade 99.5% alumina, then ground and polished to a mirror finish with roughness down to 0.02 microns Ra.

The dense, non-porous surface releases wafers cleanly, resists the aggressive chemistries of etch and deposition chambers, and stands up to repeated plasma exposure without degradation. Vacuum grooves, lift pin holes and edge contours are precision machined to the tool design, making each chuck a ready to install component rather than a blank.

• Mirror polished surface: Ra 0.02 µm finish minimizes particle trapping and improves wafer backside contact.
• Vacuum grade purity: 99.5% alumina with controlled trace elements prevents metallic contamination of wafers.
• Plasma resistance: Inert surface survives aggressive fluorine and chlorine process chemistries without erosion.
• Thermal stability: Operates reliably across the temperature range of etch, CVD and implant processes.
• Precision machined features: Vacuum grooves, pin holes and notches machined to the chuck drawing with tight tolerances.
• Low particle generation: Fully dense surface produces minimal wear particles during wafer handling cycles.
• Long consumable life: Hard polished surface keeps its finish through thousands of wafer runs between refurbishments.

These chucks serve semiconductor processing equipment including plasma etch systems, PVD and CVD deposition tools, metrology stages, wafer inspection fixtures and photolithography support stages, as well as similar handling requirements in LED and photovoltaic manufacturing.

We manufacture both OEM design chucks and replacement units for installed tools, with each part documented by serial number for process traceability.

Polished chucks are cleaned, wrapped in cleanroom grade film and packed in foam-lined rigid cases to protect the optical quality surface during shipment.

Every chuck is delivered with a surface finish and dimensional inspection report, and cleanroom packaging options are available on request.