Rearden Precision · Houston, TX
Oxygen-free C10100. ASTM B187 / H02 half-hard. The grade aerospace, defense, and nuclear drawings specify by name. No deviation request needed.
≥99.99% Cu · ≥101% IACS · ≤5 ppm O₂ · 1/8″–3/4″ × 3/4″–6″
— Feedstock & wire rod
C10100 OFE rod via RCIcast® continuous casting. 8–20 mm. 6,000 lb coils on wooden skid. For fine wire drawing, power cable, magnet wire, and e-mobility harnesses.
ASTM B49 · UNS C10100 · Grade 1 cathode ASTM B115
— Continuous rotary extrusion
Round bar, hexagonal bar, and fully custom shapes via KONFORM continuous extrusion. Near-net geometry. No head/tail crop. Cross-section 75–2,000 mm².
OFE C10100 · ASTM B187 where applicable · Up to 19 ft cut lengths
Copper grade selection for busbar
Conductivity is not where the grades differ. The number that matters is oxygen — and what it does under heat, in a hydrogen furnace, under tight-radius forming, or inside a laser weld.
| Criterion | C11000 ETP · Tough Pitch |
C10200 OF · Oxygen-Free |
C10100 — Our Base Metal OFE · Oxygen-Free Electronic |
|---|---|---|---|
Oxygen content The one number everything else follows |
200–400 ppm Cu₂O throughout the matrix |
≤ 10 ppm Essentially oxide-free |
≤ 5 ppm Essentially oxide-free |
Minimum copper Purity floor by specification |
99.90% Cu | 99.95% Cu | 99.99% Cu Four nines. Every trace element bounded. |
Conductivity at 20°C Where the marketing usually lies |
100–101% IACS | 101% IACS | 101% IACS or better We will not sell you this as the reason. |
Brazing & hydrogen furnace Reducing atmosphere under heat |
Susceptible Cu₂O reduces to intergranular steam. Cracks at grain boundaries. |
Immune | Immune Bend-tested per lot to confirm. |
Tight-radius forming Compact enclosures, 120° bends |
Surface cracking risk | Good | 120° verified Bend tested every lot. No cracking. |
Laser & ultrasonic welding Battery and interconnect joints |
Porosity & spatter | Low porosity | Most repeatable Penetration depth and pull strength hold weld to weld. |
Drawings that mandate OF Aerospace, defense, nuclear, magnet wire |
Not permitted | Usually accepted | Specified by name No deviation request needed. |
Cost per pound Where tough pitch wins clearly |
Lowest cost | Mid premium | Premium grade Worth it only where the rows above matter. |
Verdict |
Specify when the bar is cut, drilled, bolted and left alone. | A sound choice. Satisfies most oxygen-free callouts at 10 ppm. | Specify when the bar will be brazed, plated, formed tight, or laser welded — or when the drawing simply will not accept anything else. |
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