C14420 Copper foil strip Manufacturer
C14420 copper foil is a high-performance copper alloy designed for applications requiring a combination of high electrical conductivity, resistance to stress relaxation, and improved formability. C14420 — also known as Copper Tin alloy — offers an ideal blend of physical and mechanical properties for advanced electronic components, connector springs, lead frames, and other precision applications.
What Is C14420 Copper Foil?
C14420 copper (UNS C14420) is a high-copper alloy with small amounts of tin (typically 0.1%) that improve its resistance to stress relaxation and enable greater dimensional stability under pressure or repeated bending — while retaining its desirable high conductivity.
ASTM B152 standard
This specification establishes the requirements for copper sheet, strip, plate, and rolled bar produced from the following coppers.
C14420 Copper Foil — Key Features:
✅ Excellent Electrical Conductivity — typically above 90% IACS
✅ Enhanced Stress Relaxation Resistance — maintains pressure under compression over time
✅ Higher Strength and Spring Qualities — greater resistance to permanent set or deformation
✅ Good Formability — can be easily stamped, formed, or deep-drawn
✅ Controlled Grain Size and Thickness — for high-precision applications
C14420 Copper Foil — Applications:
C14420 copper foil is broadly used in high-reliability electronic components and assemblies, including:
- Automotive electronic connectors
- Relay springs and switches
- Lead frames for integrated circuits (ICs)
- Connectors requiring resistance to stress relaxation under pressure
- Flexible circuits and printed circuit boards (PCBs)
- Battery components and other high-performance electronic applications
C14420 Copper Foil — Chemical Composition:
| Element | Weight (%) |
|---|---|
| Copper (Cu) | Balance |
| Tin (Sn) | 0.05–0.15 |
| Phosphorus (P) | 0.010–0.040 |
| Other | max 0.5 |
C14420 Copper Foil — Thickness and Size:
- Thickness: typically 0.05 mm to 0.20 mm, custom thickness available upon request
- Width: up to 300 mm or greater, depending on customer specification
- Coil or sheet delivery forms, per application’s needs
C14420 Mechanical Property
| Temper | Temper | JIS | Tensile Rm MPa | Elongation A50 % | Hardness HV |
| Soft | M | O | 220-275 | ≥15 | 50-70 |
| 1/4 hard | Y4 | 1/4H | 240-300 | ≥9 | 65-85 |
| Hard | Y | H | 330-450 | 100-140 | |
| Extra hard | T | EH | 380-510 |
C14420 foil Sizes and Tolerances
| Thickness (mm) | Thickness Tolerances (mm) | Width (mm) | Width Tolerances (mm) |
| 0.03-0.06 | ±0.003 | 16-500 | ±0.08 |
| >0.06-0.10 | ±0.005 | ||
| > 0.10-0.20 | ±0.008 |
C14420 Foil Specifications available
| Thickness (mm) | Width (mm) | Temper |
| 0.03-0.06 | 16-240 | Y,T |
| >0.06-0.10 | 16-290 | Y,T |
| >0.10-0.20 | 16-500 | M,Y4,Y,T |
| Inner diameter of coil:78mm,102mm and 150mm. | ||
We are a professional C14420 copper foil manufacturer and exporter in China, supplying high-precision copper strip and foil products for electronic, electrical, and heat-exchange applications. Our tellurium-bearing copper alloy C14420 combines excellent electrical conductivity, high thermal conductivity, and superior machinability, making it ideal for modern manufacturing industries.
