In Ultra-High Vacuum (UHV) engineering, choosing between 316L Stainless Steel and C10100 (OFE) is a trade-off between structural strength and thermal/vacuum performance. While stainless steel is the standard for chamber shells, C10100 Oxygen-Free Electronic copper is non-negotiable for active internal components, heat sinks, and RF cavities.
If your vacuum system involves high heat loads or requires rapid bake-out cycles, using stainless steel as a substitute for copper will lead to thermal "hot spots" and unacceptably high base pressures.
Thermal Conductivity: Why Stainless Steel is a Heat Insulator
The most dramatic difference is how these materials handle heat. Stainless steel is a poor thermal conductor, which makes it useless for dissipating the heat generated by electron beams or ion sources.
316L Stainless Steel: Thermal conductivity is only 15 - 20 W/m-K.
C10100 (OFE): Thermal conductivity is 391 W/m-K.
By utilizing C10100 Plate, Sheet for internal mounting plates, you move heat nearly 20 times faster than with steel. In a vacuum where convection is zero, this conduction is the only thing preventing your sensors from melting.
C10100 vs. 316L Stainless Steel Physical Comparison
| Property | C10100 (OFE Copper) | 316L Stainless Steel | UHV Engineering Impact |
| Purity | 99.99% Min | Alloy (Fe/Cr/Ni/Mo) | Copper has lower outgassing |
| Oxygen Content | < 5 ppm | N/A | Copper prevents embrittlement |
| Thermal Cond. | 391 W/m-K | ~16 W/m-K | Copper dissipates heat 20x faster |
| Magnetic Perm. | < 1.000005 | ~1.02 (Can vary) | Copper is truly non-magnetic |
| Outgassing Rate | Ultra-Low | Moderate (H2 risk) | Copper reaches base pressure faster |
Consult GNEE Engineers on UHV Outgassing & Heat Load Management
Outgassing and Bake-out: Reaching Base Pressure Faster
The 99.99% purity of C10100 means it lacks the trapped gases and volatile impurities (like sulfur or phosphorus) found in stainless steel alloys. While stainless steel can trap hydrogen in its lattice, certified OFE Grade 1 copper has an extremely low outgassing rate after a standard bake-out.
As we analyzed in our previous article on cryogenic and UHV applications, the absence of cuprous oxide inclusions (thanks to the 5 ppm oxygen limit) ensures that the material doesn't release moisture or gas during the heating cycle. This is vital for the production of Custom CNC Machined Parts used in particle accelerators and semiconductor ion sources.
Magnetic Permeability: Preventing Beam Distortion
For systems involving electron or ion optics, magnetic interference is a deal-breaker. Stainless steel, even "non-magnetic" 316L, can develop magnetic spots after welding or cold working. C10100 is inherently non-magnetic and remains so regardless of the fabrication process.
Using C10100 for beam-line components ensures that your particle beams aren't deflected by stray magnetic fields. Furthermore, the 101% IACS conductivity of C10100 allows it to be used as an EMI/RFI shield within the vacuum chamber, a performance level that stainless steel cannot match.
When to Choose Copper vs. Steel
| Choose C10100 (OFE) if... | Choose Stainless Steel if... |
| High heat dissipation is required | High structural strength is needed |
| RF power is being transmitted | Low cost is the primary driver |
| Cryogenic temperatures (< 77K) | High-temperature structural load (> 600C) |
| Strictly non-magnetic environment | General chamber shell/housing |
In most high-performance UHV systems, the answer is not one or the other, but a combination. Use stainless steel for the structural integrity of the chamber and C10100 Oxygen-Free Electronic copper for everything that touches the heat, the electricity, or the beam. GNEE METAL provides the certified 99.99% pure plates and machined components necessary to ensure your vacuum system hits its target pressure without delay.
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GNEE METAL Product Range
| Product Type | Shapes Available | Common Grades | Diameter/Thickness Range | Length/Width Range | Applications |
|---|---|---|---|---|---|
| Copper Tubes | Round, Square, Rectangular, Coiled | C10100, C10200, C11000, C12200, C12000 | OD: 0.5mm - 300mm Wall: 0.1mm - 20mm | Up to 6000mm or custom | HVAC, Plumbing, Heat Exchangers, Refrigeration, Hydraulic Lines |
| Copper Plates & Sheets | Flat Sheets, Perforated, Embossed, Tread Plate | C10100, C11000, C12200, C23000, C26000 | Thickness: 0.1mm - 200mm | Width: Up to 2500mm Length: Up to 6000mm | Electrical Busbars, Roofing, Cladding, Gaskets, Transformers |
| Copper Bars & Rods | Round Bar, Square Bar, Hexagonal Bar, Flat Bar | C10100, C11000, C14500, C17200, C18200 | Diameter: 1mm - 300mm | Length: 1000mm - 4000mm | Machined Components, Electrical Contacts, Busbars, Fasteners |
| Copper Wires | Round Wire, Flat Wire, Square Wire, Stranded, Braided | C11000, C11600, C17200, C17510 | Diameter: 0.05mm - 12mm | Coil weights: 1kg - 500kg | Electrical Wiring, Cables, Springs, Mesh, Welding Wire |
| Copper Strips & Coils | Thin Strip, Foil, Slit Coil, Profile Strip | C11000, C12200, C19400, C26000, C26800 | Thickness: 0.03mm - 5mm | Width: 2mm - 1000mm Coil ID: 300mm - 600mm | Transformers, Radiators, Shielding, Terminals, Connectors |
About Our Factory
We operate a full range of production lines including extrusion presses, cold drawing benches, high-speed rolling mills, slitting lines, and precision CNC machining centers, enabling us to produce copper tubes, plates, bars, wires, and strips entirely in-house. For quality assurance, we maintain a dedicated inspection laboratory equipped with spectral analyzers, universal testing machines, hardness testers, surface roughness testers, and optical measuring instruments. Every batch is tested for chemical composition, mechanical properties, and dimensional accuracy before shipment. Our production capacity reaches 500+ tons per month, and we hold ISO 9001:2015 certification with full traceability from raw material to finished product. Whether you need standard mill stock or custom-processed components, we deliver precision copper products with short lead times and complete material certification.
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