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Formula: Cu 55/Ni 45
Form: Pellet/Lump
Material: Constantan®
Commodity: Alloys
Maximum Lump Size: 43mm
Constantan® Pellets are a high-precision Cu–Ni alloy feedstock, typically containing ~55% copper and ~45% nickel, valued for its unique combination of stable electrical resistivity and low thermal coefficient of resistance across a broad temperature range. This stability, alongside excellent oxidation resistance and good mechanical strength, makes it ideal for manufacturing electrical resistors, thermocouples, and precision sensing elements. The pellet form enables uniform melting, precise alloying, and efficient handling in both research and production. Common industrial applications include strain gauge production, resistance heating elements, and temperature measurement devices. Specific technologies benefiting from Constantan® include high-reliability resistive circuits, precision thermal sensors, and laboratory instrumentation requiring minimal drift under varying thermal conditions. In research, it is indispensable for studies in thermoelectricity, resistive materials, and thermal cycling stability. Constantan® Pellets hold significant value in both scientific and industrial contexts, enabling the production of components that must perform with consistent electrical properties in fluctuating environments.

Health hazard/Hazardous to the ozone layer

Serious health hazard

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Tolerances

Pellet/Lump
Maximum Lump Size Nominal

Material Properties for Alloys

Mechanical Properties
Element Value
Hardness - Brinell 100-300
Elongation at break( % ) 45
Modulus of elasticity( GPa ) 162
Izod impact strength( J m⁻¹ ) 107
Tensile strength( MPa ) 400-590
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 52
Temperature coefficient( K⁻¹ ) 0.00002+/-
Thermal Properties
Element Value
Maximum use temperature in air( C ) 500
Melting point( C ) 1225-1300
Thermal conductivity( W m⁻¹ K⁻¹ ) 19.5@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 14.9@20-100°C
Physical Properties
Element Value
Density( gcm⁻³ ) 8.9

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