In the world of superconducting magnets, MRI systems, and quantum dilution refrigerators, the performance of copper at 4.2K (liquid helium temperature) is vastly different from its behavior at room temperature. For a procurement manager in these high-tech sectors, the choice between C11000 (ETP) and C10100 (OFE) isn't just about purity; it's about the RRR (Residual Resistivity Ratio).
While C11000 is a fine conductor for standard industrial grids, it is an absolute failure in cryogenic environments. Understanding why C10100 Oxygen-Free Electronic copper is mandatory for sub-zero science is key to preventing system "quenches" and data loss.
What is the RRR Value and why does it matter for C10100?
RRR is the ratio of a material's electrical resistance at room temperature (293K) to its resistance at liquid helium temperature (4.2K). In pure metals like copper, resistance drops as temperature decreases, but it is eventually "limited" by the presence of impurities and defects in the metal lattice.
C11000 (ETP): Typically has an RRR value of only 30 to 50.
C10100 (OFE): Can achieve RRR values of 100 to over 400.
Because our C10100 is 99.99% pure and contains less than 5 ppm oxygen, it lacks the "impurity scattering" that plagues lower grades. For a superconducting magnet, a high RRR value means the copper can safely shunt massive amounts of current if the superconductor "goes normal," protecting the entire multi-million dollar system from thermal destruction.
Cryogenic Performance: C10100 (OFE) vs. C11000 (ETP)
| Property at 4.2K | C10100 (OFE Grade 1) | C11000 (ETP Copper) | Impact on Cryo-Systems |
| Purity | 99.99% Min | 99.90% | Impurities increase resistance |
| RRR Value | 100 - 450 | 30 - 50 | C10100 stays conductive at 4K |
| Thermal Cond. | Excellent (High RRR) | Poor (Low RRR) | C10100 prevents "Quenching" |
| Oxygen Content | < 5 ppm | ~300 ppm | C10100 avoids embrittlement |
| Magnetoresistance | Lower | Higher | More stable in magnetic fields |
Consult GNEE Engineers on C10100 RRR Values for Your Project
Why C11000 ETP is dangerous for liquid helium cooling paths
In cryogenic applications, heat transfer is as critical as electrical flow. C11000 contains cuprous oxide inclusions that scatter phonons and electrons, significantly reducing its thermal conductivity at liquid helium temperatures.
By using C10100 Seamless Tube & Pipe for cooling lines, you ensure that the liquid helium can effectively remove heat from the superconducting coils. The high metallurgical density of C10100 prevents leaks and ensures that the system maintains its vacuum integrity over years of thermal cycling. For more data on the physical constants of this material, see our C10100 mechanical and physical data guide.
Sourcing C10100 for MRI and Particle Accelerators
When procurement teams source C10100 Round, Square & Flat Bar for MRI gradient coils or accelerator lead-ins, they must look for the ASTM B170 Grade 1 certification. As we analyzed in our guide on how to verify a C10100 MTR, the RRR value is not always listed on standard industrial reports. You must specifically request high-RRR-certified OFE copper.
GNEE METAL provides the fully traceable 99.99% pure copper needed for zero-failure environments. Whether you are building a quantum computer or a clinical MRI, our Custom CNC Machined Parts made from C10100 ensure your cryogenic system operates at the highest level of stability.
Purity Defines Cryogenic Performance
In the deep-freeze of cryogenic science, C11000 is a thermal and electrical insulator compared to C10100. The ROI of choosing certified Grade 1 OFE copper is found in the safety of your superconducting magnets and the precision of your data. GNEE METAL is committed to delivering the high-RRR material required to push the boundaries of modern physics and medical imaging.
Request a Quote for Cryogenic-Grade C10100 Components
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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