CuNi 70/30 Resistance Wire GOST 17202-70 Stable Conductivity For Sensor Resistor

CuNi 70/30 resistance wire is one of the most reliable copper-nickel alloys used across precision measurement and electrical systems. With a balance of copper (70%) and nickel (30%), it delivers stable conductivity, excellent corrosion resistance, and dependable long-term performance. Recognized under GOST 17202-70, it is also aligned with international equivalents, making it a trusted material in global applications where accuracy and durability are key.

The strength of CuNi 70/30 lies in its balanced composition. Nickel improves corrosion resistance and mechanical strength, while copper maintains good electrical conductivity. Together, they create a wire with stable resistivity across a wide temperature range. Unlike pure copper, which suffers from significant resistance variation with temperature, CuNi 70/30 maintains stable performance, making it ideal for resistors and sensors.

Its resistivity is approximately 0.49 µΩ·m, which ensures consistent performance in circuits requiring precise resistance. In addition, CuNi 70/30 has a service temperature of up to 600°C, allowing it to withstand both industrial and laboratory conditions without significant drift.

CuNi 70/30 finds use in a broad range of industries. One of its primary applications is in precision resistors, where stable resistance values are essential for accurate current control and long-term reliability. It is also widely used in sensors, where conductivity and low drift ensure accurate measurement outputs.

In thermocouples, CuNi 70/30 is often employed as part of the alloy pair due to its stable voltage response and compatibility with other metals. Beyond instrumentation, its corrosion resistance makes it suitable for marine electrical systems, where reliability in saltwater environments is crucial.

As industries increasingly rely on data accuracy and stable monitoring, the demand for CuNi 70/30 is growing. With the expansion of renewable energy systems, precise sensors are needed to regulate and optimize energy production. Similarly, automation and advanced electronics demand resistors that do not shift with time or temperature.

The global movement toward digitalization has amplified the importance of stable electrical components, and CuNi 70/30 resistance wire is at the heart of this trend. Its role in ensuring consistent data output supports critical applications in aerospace, automotive, and energy sectors.

When compared with other resistance alloys, CuNi 70/30 stands out for its balance of stability and durability. Constantan 55/45 offers slightly lower thermal drift, but at a lower maximum service temperature. NiCr alloys perform better at very high temperatures, but their higher resistivity makes them less suitable for precision measurement applications.

This comparative advantage places CuNi 70/30 as the ideal middle ground, offering both durability and precision in environments where accuracy and stability must go hand in hand.

CuNi 70/30 is standardized under GOST 17202-70 in Russia, but equivalents also exist worldwide. ASTM standards in the USA and DIN standards in Germany recognize similar compositions, which facilitates international adoption. This global compatibility ensures that engineers and manufacturers can specify CuNi 70/30 across projects without supply chain obstacles.

At DLX, we prioritize consistency and precision in supplying CuNi 70/30 resistance wire. Our control over alloy composition guarantees stable resistivity, while our ability to produce in multiple forms—wire, strip, foil, and bar—means we can meet the needs of diverse industries. Customers benefit from our technical expertise, ensuring the correct material is selected for their application.

DLX also offers customization, including specific resistance values, diameters, and tolerance levels. This flexibility supports industries ranging from large-scale power systems to highly specialized laboratories. Our emphasis on quality and performance ensures that customers using DLX CuNi 70/30 resistance wire achieve long-lasting, reliable results.

Looking ahead, the role of CuNi 70/30 resistance wire is set to expand further. As sensors and resistors become integral to emerging technologies such as electric vehicles, renewable energy, and smart infrastructure, the need for materials that can maintain precision over time will grow. CuNi 70/30, with its proven performance and adaptability, will remain a cornerstone of this evolution.

DLX is committed to advancing this growth by offering reliable supply, technical support, and innovation in material processing. By ensuring consistency and meeting global standards, DLX positions itself as a trusted partner for industries worldwide.

CuNi 70/30 resistance wire is more than a material—it is an enabler of precision in modern technology. Its stable conductivity, corrosion resistance, and alignment with GOST 17202-70 and other global standards make it indispensable in sensors, resistors, thermocouples, and marine systems. With DLX’s focus on quality, customization, and customer support, industries can rely on our CuNi 70/30 to deliver stability, accuracy, and long-term performance.