Thermal and Electrical Insulation for High-Temperature Critical Applications

Politubes offers a specialized line of polyimide (Kapton®) tubes and caps, manufactured using ultrasonic welding technology and designed to provide electrical insulation and thermal protection for heating components operating in high-temperature environments.

These components can withstand temperatures exceeding 300 °C and offer excellent dielectric strength, making them ideal for applications such as:

• Anti-condensation resistors (RAC)
• Cartridge heaters
• Thermistors and electrical resistors
• Heating elements
• PTC resistors
• PTC (Positive Temperature Coefficient) heating modules

Politubes polyimide tubes and caps are also used inside PTC heating assemblies, serving as a functional structural barrier to electrically insulate the active elements.

Specifically:

• The PTC element is housed within an internal plastic frame, in contact with two opposing metal plates connected to the power supply.
• The assembly is then enclosed within a Politubes insulating cap, which acts as an electrical and protective barrier.
• The entire system is finally inserted into an aluminum heat sink, which is plastically deformed to ensure optimal contact pressure.

Technical Features and Customization

• Material: Polyimide Kapton® (DuPont™)
• Thermal resistance: >300 °C
• High dielectric strength, ideal for critical applications
• Available configurations:
  • Open-ended tubes (both sides open)
  • Tubes with one ultrasonically hermetically sealed end, ensuring maximum safety, protection against contaminants, and secure containment

Our Kapton® polyimide components are engineered to integrate seamlessly into automated production processes and compact high-efficiency devices, ensuring reliable and long-term performance.

Kapton® is a registered trademark of DuPont™.