C87800 annealed copper wire is a soft-temper copper alloy wire produced through a full annealing process that recrystallizes the grain structure, effectively eliminating internal stresses and work-hardening effects from prior drawing operations. This thermal treatment results in a highly ductile and flexible material with reduced tensile strength, making it exceptionally suitable for applications that require intricate bending, coiling, twisting, or other forms of cold working without the risk of fracture.
In terms of electrical and mechanical performance, C87800 annealed copper wire offers excellent electrical conductivity with low resistivity, ensuring efficient current transmission for precision electronic and electrical systems. Its combination of softness, good formability, and improved fatigue resistance under cyclic loading makes it a preferred choice for flexible connectors, winding wires, harness assemblies, and vibration-prone environments where long-term reliability is critical.
| Parameter | Value / Range |
|---|---|
| Material Designation | C87800 |
| Temper | Annealed (Soft / O-Temper) |
| Applicable Standard | ASTM B124 / B124M, SAE J461 |
| Chemical Composition (wt%) | |
| Copper (Cu) | 75.0 – 80.0 |
| Zinc (Zn) | Remainder (approx. 18 – 22) |
| Lead (Pb) | ≤ 0.05 |
| Iron (Fe) | ≤ 0.05 |
| Tin (Sn) | ≤ 0.10 |
| Silicon (Si) | 0.10 – 0.30 |
| Aluminum (Al) | ≤ 0.01 |
| Total Impurities | ≤ 0.20 |
| Physical Properties | |
| Density (g/cm³) | 8.65 |
| Electrical Resistivity at 20°C (µΩ·cm) | 5.6 – 6.2 |
| Electrical Conductivity (%IACS) | 28 – 32 |
| Thermal Conductivity (W/m·K) | 105 – 115 |
| Coefficient of Thermal Expansion (20–300°C, 10⁻⁶/K) | 18.5 |
| Mechanical Properties (Annealed) | |
| Tensile Strength (MPa) | 200 – 280 |
| Yield Strength (0.2% Offset, MPa) | 60 – 100 |
| Elongation (% in 50mm) | ≥ 40 |
| Hardness (HV) | 45 – 65 |
| Electrical Performance | |
| Volume Resistivity at 20°C (Ω·mm²/m) | 0.056 – 0.062 |
| Dimensional Tolerances | |
| Diameter Range (mm) | 0.10 – 8.00 |
| Diameter Tolerance (mm) | ±0.005 (for ≤0.50mm) / ±0.010 (for >0.50mm) |
| Ovality (Max) | 50% of diameter tolerance |
| Surface Quality | |
| Surface Finish | Smooth, free from cracks, scratches, pits, and oxides |
| Oxidation Level | Light oxidation acceptable; heavy oxidation not permitted |
| Packaging | |
| Spool / Coil Weight (kg) | 5 – 200 (depending on diameter) |
| Core Diameter (mm) | ≥ 100 (to avoid kinking) |
| Winding | Level-layer wound or random wound |
