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Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors

Name: Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors
Brand: Shanghai Tankii Alloy Material Co.,Ltd
SKU: 6J40 /CuNi44
Price: 27.00 USD
Availability: InStock

Product Details

Place of Origin: China

Brand Name: Tankii

Certification: ISO9001

Model Number: 6J40 /CuNi44

Payment & Shipping Terms

Minimum Order Quantity: 30Kg

Price: 20-35USD /Kg

Packaging Details: case

Delivery Time: 15-30days

Payment Terms: T/T,Western Union

Supply Ability: 50tons/Month

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Specifications

Description

Specifications

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                                                                                                                                                                                                                                                                                                                                                  Constantan alloy resistance foil, ultra-thin copper nickel strip, 6J40 resistance alloy foil
                                                  

Electrical Resistivity (20°C):	0.48 - 0.49 μΩ·m (48-49 μΩ·cm)	Temperature Coefficient Of Resistance (TCR):	±20 To ±40 Ppm/°C (adjustable Through Heat Treatment)
Maximum Continuous Service Temperature:	400°C	Density:	8.9 G/cm³
Melting Point:	1280°C

Electrical Resistivity (20°C):	0.48 - 0.49 μΩ·m (48-49 μΩ·cm)
Temperature Coefficient Of Resistance (TCR):	±20 To ±40 Ppm/°C (adjustable Through Heat Treatment)
Maximum Continuous Service Temperature:	400°C
Density:	8.9 G/cm³
Melting Point:	1280°C

Description

Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors

Constantan Alloy 6J40 Copper Nickel Foil / Ultra-thin Resistance Strip

Constantan 6J40 (also known as CuNi40, CuNi44, NC50, Eureka, Konstantan, or Cuprothal) is a copper-nickel precision resistance alloy containing approximately 40-44% nickel. It is characterized by high electrical resistivity, low temperature coefficient of resistance (TCR), and excellent corrosion resistance. The ultra-thin foil and strip forms are specifically designed for precision resistors, strain gauges, and shunt applications.

Element	Content (%)
Nickel (Ni)	39 - 44%
Manganese (Mn)	1.0 - 2.0%
Copper (Cu)	Balance
Iron (Fe)	≤0.5%
Silicon (Si)	≤0.5%
Cadmium (Cd)	ND (Not Detected)
Lead (Pb)	ND
Mercury (Hg)	ND
Chromium (Cr)	ND

Physical & Electrical Properties

Property	Value
Electrical Resistivity (20°C)	0.48 - 0.49 μΩ·m (48-49 μΩ·cm)
Temperature Coefficient of Resistance (TCR)	±20 to ±40 ppm/°C (adjustable through heat treatment)
Maximum Continuous Service Temperature	400°C
Density	8.9 g/cm³
Melting Point	1280°C
Thermal EMF vs. Copper (0-100°C)	-43 μV/°C
Thermal Conductivity	21.2 - 23 W/m·K
Thermal Expansion Coefficient (20-100°C)	14.9 - 15 × 10⁻⁶/°C
Specific Heat	0.41 J/g·K

Mechanical Properties

Condition	Tensile Strength	Elongation
Annealed (Soft)	340 - 535 MPa	≥25%
Cold Rolled	680 - 1070 MPa	≥2%
Typical Yield Strength	250 MPa	-

Key Applications

Precision foil resistors and chip resistors
Strain gauges and load cells
Current sensing shunts and ammeter shunts
Thermocouple compensation wires (Type J and Type T negative element)
Potentiometers and industrial rheostats
Temperature-stable resistors for instrumentation
Heating elements and heating cables
Bimetal heating applications
Aerospace and industrial electronic

Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors

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Constantan Alloy 6J40 Copper Nickel Foil with High Electrical Resistivity Low TCR and Excellent Corrosion Resistance for Precision Resistors

Constantan alloy resistance foil

ultra-thin copper nickel strip

6J40 resistance alloy foil

Physical & Electrical Properties

Mechanical Properties

Key Applications

alloy of copper and nickel,

nickel copper alloy,