Kaxite Sealing manufactures silver plated OFHC copper gaskets from 99.99% pure electronic-grade oxygen-free high conductivity copper. The silver plating blocks the oxide layer that would otherwise form on plain copper during high-temperature bakeout — the oxide that later flakes off and contaminates your vacuum chamber.
Each gasket passes through rumble-deburring, acid-etching to remove surface skin, silver plating, UHV cleaning and individual packing. The result is a clean, repeatable sealing component for ion pumps, mass spectrometers, thin-film deposition chambers, synchrotron beamlines and semiconductor process equipment.
Standard sizes cover CF16 to CF250 flanges. Custom sizes, OEM private-label packaging and flexible MOQ are available for B2B buyers. Send your flange size, quantity and destination port and we will quote.
A silver plated OFHC copper gasket is a metal seal for CF (ConFlat) ultra-high vacuum flanges. The base material is 99.99% pure electronic-grade oxygen-free high conductivity copper — OFHC for short. The gasket is then silver plated on the surface to prevent oxidation during high-temperature bakeout, which is common in UHV systems.
When you bake a vacuum chamber to reach UHV, a plain copper gasket starts to oxidise. The oxide layer flakes off over time and contaminates the chamber. Silver plating stops that oxidation at the surface, so the gasket stays clean through repeated bakeout cycles and the chamber stays free of oxide particles.
The silver plating is not decoration. It is the difference between a gasket that contaminates your chamber after three bakes and one that survives hundreds of cycles.
Kaxite Sealing production notePlain OFHC copper gaskets work well in systems that are pumped down once and stay sealed. They become a problem in systems that are opened, cleaned and baked frequently — semiconductor process tools, surface science chambers, synchrotron beamlines and research UHV systems.
Oxidises during bakeout. Oxide flakes off and contaminates the chamber. Requires more frequent replacement and chamber cleaning. Not recommended for bakeout-heavy HV and UHV systems.
Silver plating blocks surface oxidation. No oxide flake contamination. Survives repeated bakeout cycles. Standard choice for HV and UHV systems that are opened frequently or baked often.
Standard sizes cover the full CF range from CF16 to CF250. Custom sizes are produced to your drawing. Send the flange size, quantity and working environment with your enquiry.
The list above shows standard CF flange sizes for reference. Exact gasket dimensions depend on the flange standard (ISO / DIN / ANSI) and the bolt circle. Send the flange drawing or the flange size and standard with your enquiry, and we will confirm the exact gasket dimensions.
Every silver plated OFHC copper gasket goes through five controlled steps before it leaves the factory. This sequence is what separates a vacuum-grade gasket from a generic copper disc.
Removes machining burrs that would otherwise scratch the flange knife edge and create a leak path.
Removes the surface skin of the copper so the silver plating bonds directly to fresh metal, not to an oxide layer.
Deposits a uniform silver layer that blocks oxidation during high-temperature bakeout cycles.
Removes plating residue and handling contamination so the gasket is ready for UHV service.
Packed one piece per bag to prevent cross-contamination and to keep the silver surface intact.
Send your CF flange size, quantity and destination port. Our sales engineers reply with a quotation, available samples and the packing options for your market.
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
