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CuNi44 foil (0.0125mm × 102mm), this copper-nickel resistance alloy, also known as constantan, is characterized by a high electrical resistance coupled with a fairly small temperature coefficient of the resistance. This alloy also shows high tensile strength and resistance towards corrosion. It can be used at temperatures of up to 600°C in air.
Standard Designations
Alloy Grade: CuNi44 (Copper-Nickel 44)
UNS Number: C71500
International Standards: Complies with DIN 17664, ASTM B122, and GB/T 2059
Manufacturer: Huona New Material, certified to ISO 9001 for precision alloy processing
Key Advantages (vs. Standard CuNi44 Foils)
This 0.0125mm × 102mm CuNi44 foil stands out for its targeted ultra-thin and fixed-width design:
Ultra-Thin Precision: 0.0125mm thickness (equivalent to 12.5μm) achieves industry-leading thinness, enabling miniaturization of electronic componentswithout sacrificing mechanical strength.
Stable Resistance Performance: Resistivity of 49 ± 2 μΩ·cm at 20°C and low temperature coefficient of resistance (TCR: ±40 ppm/°C, -50°C to 150°C)—ensures minimal resistance drift in high-precision measurement scenarios, outperforming thinner non-alloy foils.
Strict Dimensional Control: Thickness tolerance of ±0.0005mm and width tolerance of ±0.1mm (102mm fixed width) eliminate material waste in automated production lines, reducing post-processing costs for customers.
Excellent Formability: High ductility (elongation ≥25% in annealed state) allows for complex micro-stamping and etching (e.g., fine resistor grids) without cracking—critical for precision electronic manufacturing.
Corrosion Resistance: Passes 500-hour ASTM B117 salt spray testing with minimal oxidation, ensuring long-term reliability in humid or mild chemical environments.
Technical Specifications
Attribute
Value
Chemical Composition (wt%)
Ni: 43 - 45 % Cu: balance Mn: ≤1.2 %
Thickness
0.0125mm (tolerance: ±0.0005mm)
Width
102mm (tolerance: ±0.1mm)
Temper
Annealed (soft, for easy processing)
Tensile Strength
450-500 MPa
Elongation (25°C)
≥25%
Hardness (HV)
120-140
Resistivity (20°C)
49 ± 2 μΩ·cm
Surface Roughness (Ra)
≤0.1μm (bright annealed finish)
Operating Temperature Range
-50°C to 300°C (continuous use)
Product Specifications
Item
Specification
Surface Finish
Bright annealed (oxide-free, no oil residues)
Supply Form
Continuous rolls (length: 50m-300m, on 150mm plastic spools)
Flatness
≤0.03mm/m (critical for uniform etching)
Etchability
Compatible with standard acid etching processes (e.g., ferric chloride solutions)
Packaging
Vacuum-sealed in anti-oxidation aluminum foil bags with desiccants; outer carton with shock-absorbing foam
Customization
Optional anti-tarnish coating; cut-to-length sheets (minimum 1m); adjusted roll lengths for automated lines
Typical Applications
Micro-Electronics: Thin-film resistors, current shunts, and potentiometer elements in wearable devices, smartphones, and IoT sensors (0.0125mm thickness enables compact PCB design).
Strain Gauges: High-precision strain gauge grids (102mm width fits standard gauge manufacturing panels) for load cells and structural stress monitoring.
Medical Devices: Miniature heating elements and sensor components in implantable devices and portable diagnostic tools (corrosion resistance ensures biocompatibility with body fluids).
Aerospace Instrumentation: Precision resistance components in avionics (stable performance under temperature fluctuations at high altitudes).
Flexible Electronics: Conductive layers in flexible PCBs and foldable displays (ductility supports repeated bending).
Huona New Material implements rigorous quality control for this ultra-thin CuNi44 foil: each batch undergoes thickness measurement (via laser micrometer), chemical composition analysis (XRF), and resistance stability testing. Free samples (100mm × 102mm) and detailed material test reports (MTR) are available upon request. Our technical team provides tailored support—including etching parameter recommendations and anti-oxidation storage guidelines—to help customers maximize the performance of this precision foil in micro-manufacturing scenarios.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Year Established:
2008
Total Annual:
8000000-100000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, hig... Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, hig...
