Constantan wire is a widely used precision resistance alloy wire, favored in electrical, electronic, and industrial measurement fields.

A common question about it is: What is another name for constantan wire? This article will answer this core question in detail, and also introduce the characteristics, applications, and our high-quality constantan wire products.

1. Core Answer: Another Name for Constantan Wire

1.1 Primary Alias: Eureka Wire

The most common alternative name for constantan wire is "Eureka wire".

This name originated from the Eureka alloy, a classic constantan-based material developed in the 19th century.

Over time, "Eureka wire" has become a universal alias for constantan wire in many regions and industries.

1.2 Other Regional/Customary Aliases

In some specific markets, constantan wire also has other aliases:

- Advance Wire: Used in certain European industrial fields, referring to constantan alloy wires with similar compositions.

- CuNi45 Wire: Named by its chemical composition (45% nickel, 55% copper), common in technical documentation.

2. Why Does Constantan Wire Have Multiple Names?

The existence of multiple aliases is mainly due to two factors:

- Historical Origin: Different regions developed constantan-related alloys independently, leading to different naming conventions.

- Application Scenarios: In specialized fields (such as precision measurement), aliases are often used to distinguish specific grades of constantan wire.

3. Key Characteristics of Constantan Wire (Eureka Wire)

3.1 Core Performance Traits

Regardless of the name used, the core characteristics of this alloy wire are consistent:

- Extremely low temperature coefficient of resistance: Ensures stable resistance value in temperature fluctuations.

- High resistivity: Suitable for manufacturing small-size, high-precision resistors.

- Good corrosion resistance: Adaptable to various mild industrial environments.

3.2 Chemical Composition

The standard composition of constantan wire (Eureka wire) is fixed:

- Nickel (Ni): 45%

- Copper (Cu): 55%

Trace elements (such as manganese) are occasionally added to optimize processing performance.

4. Constantan Wire vs. Similar Alloy Wire: Comparison Table

The following table compares constantan wire (Eureka wire) with copper-nickel 90/10 wire and pure copper wire, highlighting its unique advantages:

Performance Parameter	Constantan Wire (Eureka Wire)	Cupro Nickel 90/10 Wire	Pure Copper Wire
Temperature Coefficient of Resistance	Very Low (±20 ppm/°C)	Low (±100 ppm/°C)	High (±4300 ppm/°C)
Resistivity (20°C)	0.49 μΩ·m	0.17 μΩ·m	0.017 μΩ·m
Maximum Operating Temperature	450°C	300°C	250°C
Typical Application	Precision Resistors, Strain Gauges	Marine Wiring, Heat Exchangers	General Electrical Conductors

5. Key Application Scenarios of Constantan Wire (Eureka Wire)

5.1 Electronic & Electrical Field

Manufacture of precision resistors, potentiometers, and heating elements in electronic devices.

Our constantan wire ensures stable performance of electronic components in complex temperature environments.

5.2 Industrial Measurement

Production of strain gauges, thermocouples, and other measurement sensors.

Its low temperature coefficient makes it ideal for high-precision data collection.

5.3 Aerospace & Automotive

Used in automotive electronic control systems and aerospace precision instruments.

Adapts to the harsh temperature and vibration environment of transportation equipment.

6. Our Constantan Wire (Eureka Wire) Products

6.1 Complete Specifications

Covers standard constantan grades (CuNi45) and various wire diameters (0.05mm - 5.0mm).

Supports both bare wire and insulated wire (PVC, Teflon insulation) options.

6.2 Customized Solutions

Provides customized alloy compositions for special temperature or corrosion resistance requirements.

Offers stranded wire and bunched wire processing to improve product flexibility.

6.3 Strict Quality Control

Complies with ASTM B165 and EN 1652 international standards.

100% pre-delivery testing, including resistance value, diameter tolerance, and temperature coefficient checks.

7. Conclusion

The most common another name for constantan wire is Eureka wire, with regional aliases like Advance Wire or CuNi45 Wire.

Regardless of the name, its core advantage of stable resistance and low temperature coefficient makes it irreplaceable in precision fields.

Our high-quality constantan wire (Eureka wire) products fully leverage these advantages. If you need reliable precision alloy wire for your project, contact us for personalized recommendations.