Jiangyin Chengxin Alloy Material Co., Ltd ，
Jiangsu Xiangcheng Supply Chain Management Co. LTD
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NF25 Nickel Content 60-65% PTC Ni-Fe Alloy Wire for Electric Blanket, Resistance 0.25
PTC Ni-Fe alloy NF25 is a nickel-iron alloy with approximately 60% nickel and 40% iron, known for its positive temperature coefficient (PTC) properties. As the temperature increases, NF25’s electrical resistance rises, making it ideal for temperature-sensitive and self-regulating applications. This unique property allows Ni-60 to be effectively used in various industrial, automotive, and electronic applications where thermal stability and precise temperature response are essential.
The alloy’s moderate electrical resistivity, high-temperature tolerance, and good corrosion resistance make it suitable for components like current limiters, temperature sensors, thermistors, and self-regulating heating elements. In particular, NF25 is valued in applications such as overcurrent protection devices and battery management systems, as well as in automotive and aerospace electronics that demand consistent performance in extreme conditions.
NF25’s reliability in fluctuating or high-temperature environments makes it versatile and useful for a range of applications requiring robust thermal control and protection. These qualities make NF25 a preferred choice for industries focused on safety and precision in thermal and electrical regulation.
| Main Chemical Composition Wt.% NF25 PTC Ni-Fe Alloy | % | Ni | Fe |
| Min | 60 | ||
| Max | 65 | Bal. |
Key features of the PTC Ni-Fe alloy NF25 include:
These features make NF25 a durable and adaptable choice for applications requiring stable and responsive thermal behavior.
Applications:
Due to its PTC behavior, NF25 is widely used in temperature sensors for automotive, industrial, and HVAC systems where resistance change can be monitored to track temperature shifts accurately.
NF25’s positive temperature coefficient allows it to act as a self-regulating current limiter, making it suitable for applications requiring overcurrent protection in circuits and electrical systems.
NF25 is used in self-regulating heating elements and thermistors, providing consistent heat generation and control in appliances, climate control systems, and industrial heating applications.
The alloy’s increasing resistance with temperature helps prevent electrical overloads, making it useful in fuses, circuit breakers, and other protective devices.
In electric vehicles and other battery-powered equipment, NF25 assists with thermal regulation to maintain safe and stable battery temperatures.
NF25’s durability in high-temperature environments makes it valuable for electronic components and sensors in aerospace and automotive sectors, where materials need to perform reliably under extreme conditions.
These applications leverage NF25’s stable thermal response, PTC characteristics, and resilience, making it a versatile choice for industries requiring precise thermal and electrical control.
Resistance Values and Naming Conventions for PTC Ni-Fe Alloy Wires
| Alloy brand | 20℃ Resistivity | The tolerance range | ||||
| NF13 | 0.13 | ±0.02 | ||||
| NF15 | 0.15 | ±0.02 | ||||
| NF20 | 0.20 | ±0.02 | ||||
| NF23 | 0.23 | ±0.02 | ||||
| NF25 | 0.25 | ±0.02 | ||||
| NF32 | 0.32 | ±0.02 | ||||
| NF36 | 0.36 | ±0.02 | ||||
| NF38 | 0.38 | ±0.02 | ||||
| NF40 | 0.40 | ±0.02 | ||||
| NF43 | 0.43 | ±0.02 | ||||
| NF46 | 0.46 | ±0.02 | ||||
| NF52 | 0.52 | ±0.02 | ||||
| NF60 | 0.60 | ±0.02 | ||||
Chemical Composition of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | Chemical element | ||||
| Ni % | Fe % | ||||
| NF13 | 85-95 | Rest | |||
| NF15 | 75-85 | Rest | |||
| NF20 | 70-75 | Rest | |||
| NF23 | 60-65 | Rest | |||
| NF25 | 60-65 | Rest | |||
| NF32 | 50-55 | Rest | |||
| NF36 | 50-55 | Rest | |||
| NF38 | 50-55 | Rest | |||
| NF40 | 50-55 | Rest | |||
| NF43 | 45-50 | Rest | |||
| NF46 | 45-50 | Rest | |||
| NF52 | 45-50 | Rest | |||
| NF60 | 45-50 | Rest | |||
Temperature Coefficients of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | 120℃ Temperature coefficient PPM | The tolerance range PPM | ||||||||||||
| NF13 | 4200 | ±300 | ||||||||||||
| NF15 | 4400 | ±300 | ||||||||||||
| NF20 | 4500 | ±300 | ||||||||||||
| NF23 | 4800 | ±300 | ||||||||||||
| NF25 | 4600 | ±300 | ||||||||||||
| NF32 | 4200 | ±300 | ||||||||||||
| NF36 | 3800 | ±300 | ||||||||||||
| NF38 | 4000 | ±300 | ||||||||||||
| NF40 | 3800 | ±300 | ||||||||||||
| NF43 | 3400 | ±300 | ||||||||||||
| NF46 | 3200 | ±300 | ||||||||||||
| NF52 | 3000 | ±300 | ||||||||||||
| NF60 | 2500 | ±300 | ||||||||||||
Mechanical properties (tensile strength)
| Category | Diameter range mm |
Elongation rate ≥ % |
|
| Cold drawn wire | 0.05 ＞ d ＜ 0.1 | ≥ 18 | |
| 0.1 ＞ d ＜ 0.3 | ≥ 20 | ||
| 0.3 ＞ d ＜ 0.5 | ≥ 20 | ||
| 0.5 ＞ d ＜ 1.0 | ≥ 20 | ||
Size (diameter)
| Alloy Code | Diameter mm | |||||
| Wire | Rod | Wire rod | ||||
| NF13 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF15 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF20 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF23 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF25 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF32 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF36 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF38 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF40 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF43 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF46 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF52 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF60 | 0.05-8.0 | 12-30 | 8-14 | |||
Support and Services:
1. Technical Consultation
2. Product Selection
3. Time Guarantee
4. Warranty and After-Sales Support
Q&A:
1. Can you provide free samples?
If the samples you need happen to be in stock, we can provide samples free of charge.
2. If we use custom products, will the price be higher?
Usually our prices are higher for special products, because it is related to production efficiency, but all prices depend on the quantity of the order.
3. What is the minimum quantity the customer can order?
If the stock of the required product is sufficient, we can provide a single copy as a sample, if the stock is insufficient, the minimum order quantity is 5kg.