🔌 COPPER
Copper Supply and Fabrication for Flint, MI Electrical and Thermal Work
Copper does the electrical and thermal jobs nothing else does as well, and in Flint that means busbars, grounding hardware, contacts, and heat-transfer components feeding automotive assembly and energy work. The challenge with copper is its softness and conductivity, which make it gummy to machine and a heat sink to weld. The Flint shops that handle copper well bring the right tooling, forming, and joining approach to a material that punishes the wrong one.
ISO 9001ISO 14001IATF 16949
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Copper's Role in Flint Manufacturing
Copper earns its place wherever electrical conductivity or heat transfer is the priority. In Flint's automotive plants and supplier base, that means busbars distributing power, grounding straps, electrical contacts, and connection hardware. As vehicle electrification grows, the demand for high-conductivity copper components in the automotive supply chain climbs with it, and the local supplier base is positioned to feed that work.
Thermal management is the other major driver. Copper's high thermal conductivity makes it the material for heat sinks, cooling plates, and heat-transfer components in energy and industrial equipment. Where a part has to move heat efficiently, copper outperforms aluminum, and Flint fabricators supply these parts to regional equipment builders.
The tradeoff is cost and weight. Copper is expensive and dense, so it is specified where its conductivity genuinely earns the premium rather than as a general structural material. Buyers sourcing copper locally are usually solving an electrical or thermal problem that cheaper materials cannot.
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C101, C110 and Tellurium Copper
C101, oxygen-free electronic copper, is the high-purity grade for the most demanding electrical and thermal applications. With minimal oxygen content, it delivers top-tier conductivity and resists hydrogen embrittlement during brazing and welding, which makes it valuable where joining is required. It serves high-performance busbars, vacuum components, and premium thermal parts.
C110, electrolytic tough pitch copper, is the standard high-conductivity grade and the most widely used. It carries around 100 percent IACS conductivity and serves the bulk of busbar, grounding, and electrical-contact work. It is more economical than C101 and covers most applications where ultra-high purity is not strictly required, though its small oxygen content makes it more prone to embrittlement if brazed improperly.
Tellurium copper, C145, is the free-machining grade. A small tellurium addition dramatically improves machinability while retaining roughly 90 percent of pure copper's conductivity. This makes it the choice for machined electrical components, contacts, and connectors produced in volume, since it cuts cleanly where C101 and C110 turn gummy and tear. For any machined copper part with quantity, tellurium copper usually wins on total cost.
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Machining and Joining Copper
Pure copper machines poorly because it is soft and gummy, building up on the cutting edge and tearing rather than shearing cleanly. The fix for high-volume machined parts is tellurium copper, which cuts like a free-machining brass while keeping most of the conductivity. For C101 and C110 that cannot be substituted, Flint shops use sharp polished tooling, high cutting speeds, light positive rake, and the right coolant to get acceptable finishes.
Forming and fabricating copper plays to its strengths, since it is highly ductile and bends, draws, and forms readily. Busbars are typically sheared, punched, formed, and finished from C110 bar and plate, and Flint fabricators handle this routinely. The soft material does require care to avoid scratches and dents that would concentrate stress or interfere with electrical contact surfaces.
Joining copper is dominated by brazing and soldering rather than fusion welding, because copper's high thermal conductivity pulls heat away from the joint so fast that it is hard to weld without massive heat input. Brazing with the right filler produces strong, conductive joints. Where copper must be welded, shops use high-energy processes and preheat to overcome the heat sink.
Frequently Asked Questions
For most busbars, C110 electrolytic tough pitch copper is the right and economical choice. It delivers roughly 100 percent IACS conductivity, which is excellent, and it is the standard grade for power distribution, grounding, and electrical connection hardware, so it is widely available and cost-effective. You step up to C101 oxygen-free copper when your application involves brazing or welding the busbar and you want to avoid hydrogen embrittlement, or when you need the absolute highest purity for a demanding electrical or vacuum application. The difference in conductivity between the two is small for most purposes, so the real decision driver is whether the part will be joined by heating: C110's small oxygen content can cause embrittlement if brazed improperly, while C101's oxygen-free chemistry handles brazing and welding without that risk. A Flint fabricator producing busbars will typically default to C110 unless your design calls for brazed joints or specifies oxygen-free copper, in which case C101 is worth the premium.
Pure copper grades like C101 and C110 are soft and gummy, which makes them machine poorly: the material smears and builds up on the cutting edge, tears instead of shearing cleanly, and produces rough surfaces and stringy chips that slow production. Tellurium copper (C145) solves this by adding a small amount of tellurium that dramatically improves machinability, letting it cut cleanly and fast much like free-machining brass, while retaining roughly 90 percent of pure copper's electrical conductivity. For any machined electrical component, contact, or connector produced in quantity, that combination usually makes tellurium copper the lowest-total-cost choice even though the raw material costs a bit more, because the machining time and tool wear drop sharply. The conductivity tradeoff is modest and acceptable for most electrical parts. The main case for sticking with C101 or C110 despite the machining difficulty is when you need maximum conductivity or oxygen-free chemistry for brazing. When you bring a machined copper part to a Flint shop, ask whether tellurium copper fits your conductivity requirement, since it can substantially reduce your part cost.
Copper is difficult to fusion weld primarily because of its very high thermal conductivity, which is the same property that makes it valuable electrically. When you apply heat to a weld joint, copper conducts that heat away from the joint so rapidly that it is hard to bring the localized area to melting temperature without enormous heat input, and that high input causes distortion and other problems. Copper's high thermal expansion and tendency toward porosity compound the difficulty. Because of this, the preferred joining method for copper is usually brazing or soldering rather than welding. Brazing with an appropriate filler alloy produces strong, electrically conductive joints at lower temperatures and is well suited to busbars and electrical connections. When copper genuinely must be fusion welded, shops use high-energy processes and preheat the part to reduce the heat sink effect, and they often choose C101 oxygen-free copper to avoid the embrittlement that the oxygen in C110 can cause during welding. A Flint fabricator will typically recommend brazing for copper assemblies unless welding is specifically required.
It depends on whether thermal performance or weight and cost matter more. Copper has significantly higher thermal conductivity than aluminum, so it moves heat more efficiently and is the better choice when maximum heat transfer in a compact space is the priority, such as in high-power-density electronics or demanding cooling applications. The downsides are that copper is much heavier and considerably more expensive than aluminum. Aluminum, by contrast, offers good thermal conductivity at a fraction of the weight and cost, which is why it dominates heat sinks where the thermal load is moderate and where weight or budget matters. Many designs actually use both, with a copper base or heat spreader where the heat concentrates and aluminum fins to dissipate it, capturing copper's conductivity where it counts and aluminum's light weight where it does not. A Flint fabricator can produce either, and the right call comes down to your specific thermal load, weight budget, and cost target. Share the heat dissipation requirement and the constraints, and they can advise which material or combination fits.
Copper's softness, which makes it easy to form, also makes it easy to scratch, dent, and mar during handling and fabrication, and those defects matter because they can concentrate stress or, more importantly, interfere with electrical contact surfaces where a clean, flat mating face is required for good conduction. Good Flint fabricators manage this by handling copper with care, using protective coverings or interleaving on sheet and bar, keeping work surfaces clean of grit, and deburring and finishing contact surfaces carefully. For busbars and contacts, the mating surfaces are often specified with a particular finish or plating, such as tin or nickel plating, both to protect the surface and to ensure reliable long-term electrical contact, since bare copper oxidizes over time and the oxide is less conductive. When sourcing copper electrical parts, specify the required surface condition and any plating on your print, and discuss handling expectations with the shop. A fabricator experienced in copper electrical work will already understand that contact-surface integrity is critical and will protect those features through the process.
Last updated: July 2026
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