Grade: C1020, C1100, C1220

Diameter: 0.03mm‑6.0mm

Temper: O,1/2H,3/4H,H,EH,SH

Cu Purity: ≥99.7%

Surface: Bright bare copper

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Product Detail1

Shanghai Metal Corporation is a leading copper wire manufacturer and supplier.

Bare copper wire is solid round metal wire manufactured from electrolytic refined copper ingots, processed by multi‑pass wire‑drawing and optional annealing treatment. Impurities such as phosphorus, arsenic, bismuth will lower conductivity or cause thermal brittleness, so electrical‑grade copper wire controls impurity content strictly. Different tempers adjust tensile strength and ductility to match installation and processing requirements. This material delivers low‑loss electric current transfer; soft temper suits bending and winding operations while hard temper is used for overhead tension‑bearing applications. It acts as core raw conductor for power transmission, grounding systems, cable manufacturing, electronic components and mechanical processing parts.

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1.Density: 8.89 g/cm³
2.Max electrical‑grade copper purity: 99.99%
3.Conductivity Benchmark: 100% IACS for fully annealed O temper
4.Thermal conductivity: 401 W/(m·K) at 20℃
5.Elongation range: 8‑40%, subject to temper condition
6.Tensile strength range: 220‑550MPa, varies by temper
7.Execution Standard: ASTM B1, ASTM B3, GB/T 3952

1. High Electrical Conductivity
Meets 100% IACS conductivity standard under annealed condition, reduces power loss during current transmission, improves energy efficiency for power‑related assemblies。
2. Adjustable Mechanical Ductility By Temper
Multiple temper options from soft annealed O to extra‑hard SH; soft grade supports repeated bending; hard grade provides high tensile strength for tension‑loaded installation。
3. Excellent Thermal Conductivity
Quickly transfers heat generated in working components, lowers local overheating risk for electrical equipment and heat‑dissipation parts.

4. Good Processing Performance
Suitable for drawing, stamping, welding and winding; reduces tool wear and supports high‑volume automated production of conductive components。
5. Stable Bare Surface Property
Bright clean bare copper surface without coating, convenient for subsequent soldering, plating and further secondary processing operations.

1. Power Cable Conductor Raw Material

Used as inner conductor for power and control cables. High‑conductivity copper minimizes transmission loss. Recommended temper: O soft temper; diameter:0.1‑4.0mm.
2. Earthing & Lightning‑protection Down‑conductor
Applied for substation grounding grid and building lightning‑protection system. Low‑resistance path safely diverts fault current and lightning surge to earth. Recommended temper:1/2H / H; diameter:1.5‑6.0mm.

3. Electronic Component Conductive Parts
Serves as raw material for component leads, relay contacts and small‑coil blanks. Good ductility fits precision winding and stamping. Recommended temper:O /1/2H; diameter:0.03‑2.0mm.
4. Mechanical Welding & Fabrication Blanks
For copper welding wire and general‑purpose machined copper fittings. Balanced strength and plasticity support welding and cold forming work. Recommended temper: 1/2H‑EH; diameter:0.5‑6.0mm.

Technical Information of Copper Wire:

Bare Copper Wire (Monofilament) Performance Parameters
Product Properties	Internal Control Standard	Acceptance Standard
Copper spikes (after ±10 turns torsion)	None	–
Crack (after ±10 turns torsion)	Total length ＜3 cm	–
Peeloff (after ±10 turns torsion)	Total length ＜3 cm	–
Copper powder, mg	≤5 mg	≤15 mg
Torsiontobreak, turns	≥30 turns, no bellshape / crack	≥25 turns
Oxygen content, ppm	200250 ppm	≤400 ppm
Detected largesize flaws(L)	≤1	–
Detected mediumsize flaws(M)	≤3	–
Detected smallsize flaws(S)	≤30	–
Detected iron particles(L/M/S)	0	–
Elongation, %	≥40 %	≥40 %
Diameter	8.0±0.2 mm	8.0±0.4 mm
Resistivity @20℃, Ω·mm²/m	≤0.01704	≤0.01707
Oxide layer thickness	＜600	–
Appearance	Smooth surface, no burrs or inclusions	Smooth surface, no burrs or inclusions

Manufacturing of Copper Wire:

Standard Packaging

Each copper‑wire coil or spool is wrapped with anti‑rust paper and PE protective film to avoid oxidation and surface scratch. Coils are bound with plastic strapping. Multiple spools / coils are separated by foam padding, loaded into fumigated IPPC wooden cases or reinforced export cartons, reinforced with steel packing belts. Clear shipping labels mark grade, temper, wire diameter, net weight, gross weight and batch number on outer package surface.

Shipping

We support FCL sea freight, LCL consolidated sea freight, air freight and international express delivery, according to total cargo weight, volume and receiving destination. Applicable trade terms include EXW, FOB, CIF. Other terms may be available upon request. Shipping cost is calculated based on gross weight, measurement volume, destination port and selected transport mode.

Lead Time

Samples:4‑7 working days

Standard stock orders:14‑24 working days

Custom temper / custom dimension orders:24‑38 working days

Q: What tempers can bare copper wire be supplied in?

A: Available in O,1/2H,3/4H,H,EH,SH temper, with customizable wire diameter and coil/spool weight.

Q: What base material grades are used for this copper wire?

A: Made of electrolytic copper grades C1020, C1100, C1220 with copper purity ≥99.7% up to 99.99%.

Q: What protective packing is used for sea transport of copper wire?

A: Wrapped with anti‑rust paper and PE film, separated by foam padding, packed in IPPC fumigated wooden cases to prevent surface oxidation and scratch.

Q: Which main standards apply for bare copper wire?

A: Main applicable standards include ASTM B1, ASTM B3 and GB/T 3952 for electrical‑purpose bare copper wire.

Q: What is the difference between O‑temper and H‑temper copper wire?

A: O temper is fully‑annealed soft copper with high ductility for bending & winding; H temper is hard‑drawn copper with high tensile strength for tension‑bearing installation.

Q: What is the key indicator for electrical‑grade copper wire?

A: It shall achieve 100% IACS conductivity (≤0.017241 Ω·mm²/m @20℃) and strictly control harmful impurity content.

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