Constantan Resistance Alloy 6J40 – Stable, Reliable, and Precision-Engineered

Introduction:

Constantan 6J40 is a high-quality copper-nickel (Cu-Ni) based resistance alloy, widely recognized for its exceptionally stable electrical resistance over a broad temperature range. With a nominal composition of approximately 60% copper (Cu) and 40% nickel (Ni), 6J40 offers consistent performance, making it a top choice for precision electrical applications.

Chemical Composition (Typical):

• Copper (Cu): 58–60%

• Nickel (Ni): 39–41%

• Manganese (Mn): ≤ 0.8%

• Iron (Fe): ≤ 0.5%

Key Features:

• Extremely Stable Resistivity: Minimal change in resistance with temperature fluctuations.

• Low Temperature Coefficient of Resistance (TCR): Ensures precise and reliable performance even in varying thermal environments.

• Excellent Workability: Easy to form, weld, and process into fine wires, strips, or foils.

• Superior Corrosion Resistance: Performs reliably in moist, chemical, or atmospheric conditions.

• Good Mechanical Strength: Suitable for both delicate instruments and rugged industrial environments.

Physical Properties:

• Electrical Resistivity: ~0.48–0.52 μΩ·m at 20°C

• Temperature Coefficient of Resistance (TCR): ~±20 ppm/°C

• Density: ~8.9 g/cm³

• Melting Point: ~1280–1320°C

Applications:Constantan 6J40 is widely used in industries where precision resistance is critical. Typical applications include:

• Precision Resistors: For laboratory, instrumentation, and metrology equipment.

• Shunt Resistors: Used for accurate current measurement.

• Thermocouple Compensation Wire: (especially paired with iron for Type J thermocouples).

• Strain Gauges: For industrial, automotive, and aerospace stress analysis.

• Load Cells and Sensing Elements: Where high stability and low drift are vital.

Why Choose 6J40 Constantan Alloy?When your project demands accuracy, stability, and durability, Constantan 6J40 delivers outstanding performance. Its reliable electrical characteristics, combined with excellent manufacturability, make it a preferred material for critical components across a wide range of industries.

At DLX ALLOY, we supply premium-quality 6J40 Constantan wire, strip, and foil, available in various sizes and custom specifications to meet your unique application requirements.
Whether you are building precision instruments or developing cutting-edge sensing technologies, our 6J40 products guarantee consistency, quality, and peace of mind.

Contact us today to learn more about how our Constantan resistance alloy can boost your project’s success!