PI heating element (polyimide heating film/heating element)

The PI heating element is an ultra-thin, flexible surface heating element made of metal-etched alloy foil and PI (polyimide) insulating film, hot-pressed at high temperature. The core is an iron-chromium-aluminum/nickel-chromium resistance heating circuit, with two layers of yellow PI film serving as insulating protective layers.

Basic Parameters

⊙Thickness: 0.13-0.25mm, very thin

⊙Voltage: DC/AC 1-220V, commonly used low voltage: 12V, 24V, 36V

⊙Long-term operating temperature: -40℃～120-150℃; short-term maximum 200-250℃ (depending on adhesive layer)

⊙Withstand voltage: AC1000-1500V Insulation Withstand Voltage

⊙Power Density: Recommended for workpieces with good heat dissipation: ≤1-1.5W/cm²; Recommended for suspended air: ≤0.5-0.8W/cm², excessive power may burn the film.

⊙Minimum Bending Radius: 0.8mm, can be repeatedly bent, suitable for curved and irregularly shaped surfaces.

⊙Resistance Tolerance: Generally ±5%~±10%, resistors, sizes, openings, and lead positions can be customized according to requirements.

Core Advantages

●Ultra-thin and flexible, suitable for curved surfaces and narrow gaps, direct adhesive-backed installation.

●Surface etching heating, uniform temperature, rapid heating, no localized hot spots, high temperature control accuracy.

●High insulation strength, oil-resistant, solvent-resistant, and anti-aging, suitable for vacuum applications and instruments.

●Lightweight, fast response, long lifespan, supports customization with integrated NTC thermistor temperature sensing hole positions.

Disadvantages & Precautions

*Cannot be cut to size! Internally, it features an etched metal circuit; cutting it will cause a short circuit and burn out. Size must be custom-made at the factory.

*Do not forcefully bend, puncture, or scratch the yellow PI insulating film, as this will cause leakage and breakdown.

*Standard adhesive-backed models cannot be immersed in water; water will seep in at the edges. Waterproofing requires custom-made edge sealing at the factory.

*It must be in close contact with the object being heated; dry heating while suspended can easily cause overheating and burnout. It is recommended to use a temperature controller/temperature switch; do not directly supply full power for extended periods without the device.

*The adhesive has limited temperature resistance: ordinary PSA pressure-sensitive adhesive has a resistance of approximately 100-120℃. For high-temperature applications, choose the silicone adhesive layer version.

Typical Applications

◎Heating of 24V low-voltage equipment, battery pack preheating, and insulation of energy storage cells.

◎Medical analyzers, beauty instruments, anti-condensation of optical lenses, and small heated bed modules for 3D printers.

◎Outdoor industrial control, low-temperature preheating of LCD displays, sensor temperature control, and preheating of small molds.