In the production of electrical connectors and fluid control components, C36000 (Free-Cutting Brass) is often the default choice due to its superior machinability and lower price point. However, when the application involves high-current loads, high-frequency signals, or Ultra-High Vacuum (UHV) environments, substituting C10100 (OFE) with brass is a recipe for system-wide failure.
For a procurement manager, the "savings" on raw material and CNC cycle time are quickly erased by thermal runaway and vacuum contamination. Understanding why the 26% IACS conductivity of brass cannot compete with the 101% IACS of C10100 Oxygen-Free Electronic copper is critical for maintaining your system's reliability.
The Conductivity Chasm: 101% IACS vs. 26% IACS
The most dangerous difference between these materials is their ability to move electrons. Brass (C36000) contains roughly 35-37% Zinc (Zn) and 2.5-3.7% Lead (Pb). While these alloys make brass exceptionally easy to cut, they act as massive roadblocks for electrical current.
C36000 Brass: Conductivity is roughly 26% IACS.
C10100 (OFE): Guaranteed 101% IACS.
This means that under the same electrical load, a brass component will generate nearly four times more heat than a C10100 part due to I-squared R losses. If you are designing high-power connectors or C10100 Round, Square & Flat Bar, the heat generated by brass will lead to contact oxidation and catastrophic thermal failure.
Physical Comparison: C10100 (OFE) vs. C36000 Brass
| Property | C10100 (OFE Copper) | C36000 (Free-Cutting Brass) | Engineering Impact |
| Purity | 99.99% Min | ~61% Cu / 35% Zn / 3% Pb | Purity determines signal clarity |
| Conductivity | 101% IACS | 26% IACS | C10100 reduces heat by 75% |
| Thermal Cond. | 391 W/m-K | ~115 W/m-K | C10100 dissipates heat 3.4x faster |
| Oxygen Content | < 5 ppm | Uncontrolled | Brass is banned for vacuum brazing |
| Machinability | 20% (Requires expertise) | 100% (Industry standard) | Brass is cheaper but fails electrically |
Consult GNEE Engineers: Is C36000 Brass Safe for My Current Load?
The Zinc Threat: Why Vacuum Systems Prohibit Brass
If you are sourcing Custom CNC Machined Parts for semiconductor or UHV equipment, brass is a hazardous substitute. The Zinc (Zn) in brass has a very high vapor pressure. During vacuum bake-out or high-temperature operation, the zinc will "sublimate" out of the brass matrix, contaminating the expensive vacuum environment and depositing on optical or electronic sensors.
C10100, as an Electronic Grade Oxygen-Free copper, is strictly limited to less than 5 ppm oxygen and virtually zero volatile impurities. It remains inert under vacuum, ensuring zero outgassing. As we analyzed in our guide on C10100 machining speeds and feeds, while C10100 requires more precise tool control, the vacuum reliability it provides is irreplaceable.
Procurement ROI: Machining Speed vs. Long-Term Reliability
When you buy C36000 brass, you are paying for the "convenience of machining." When you buy C10100, you are paying for "system security."
High-Frequency Signal Integrity: The alloy elements in brass cause significant signal distortion and attenuation. C10100's 99.99% purity ensures maximum signal fidelity.
Thermal Management: A heat sink made of brass is only 30% as effective as one made from C10100. This can lead to the destruction of high-value processors or laser diodes.
Welding Integrity: The lead and zinc in brass create toxic fumes and brittle joints during welding. C10100 is perfectly suited for laser welding and vacuum brazing, meeting ASTM B170 Grade 1 standards.
If your component is a low-voltage fastener or a non-conductive mechanical support, C36000 is a cost-effective choice. However, if the part carries high current, high frequency, or operates in a vacuum, C10100 is the only viable material. GNEE METAL provides certified Grade 1 C10100 in plates, bars, and custom machined parts, ensuring your high-performance systems operate with the safety margin they require.
Request a Quote for Certified C10100 Bars and Machined Parts
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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