Kapton® RS - electrically heated film

Kapton® RS is a conductive variant of the standard Kapton® HN model. By adding conductive particles, DuPont was able to design a conductive, very flexible and lightweight RS model, in which half the film thickness (25 µm) is an insulater, while the other half (25µm) provides an ideal Ohmic resistor. The surface resistance is 100 Ohm/square and remains constant over a wide range of temperatures. The film can be used between -270°C and +240°C and in an oxygen-free atmosphere this can extend even to up to 325°C!

Kapton® 200RS100 is made completely from polyimide, which lends the foil its excellent characteristic chemical and thermal properties.

In the case of Kapton® RS, in contrast to coatings or evaporated layers, the conductivity is established via a uniform layer of filled polyimide. This 25 µm thick layer cannot easily be broken or abraded.
As the entire surface is used for heat dissipation, this results in a very high efficient energy conversion.

  • Continuous operation up to 240°C
  • Constant resistance over wide temperature ranges
  • Very uniform heat distribution over the area
  • Damage (e.g. perforation) does not leads to complete failure (operational safety)
  • Hot spots can be created within a single area
  • Very fast activation and deactivation (<30 seconds)
  • When laminating on top of metal the output can exceed 20 W/cm²!!

The dissipated output of heat can be controlled by stamping, cutting and applying accurate geometry to the printed conductor paths for the power supply. In this way, the film can be adapted individually for different applications for operating voltages between 12V and 400V+.

One application involves the use of Kapton® RS in PEM- fuel cells that are in discontinuous operation. In this situation problems with the process often arise due to the formation of water as soon as the overall system cools below 0°C. In automotive applications, for instance, part of the energy gained must therefore be used to remove water from the fuel cell.
In this case, Kapton® RS can be used to introduce heat energy into the fuel cell system extremely quickly via a back-up battery. The film heats up instantaneously and gives off an amount of heat that is more-or-less freely determinable.

Other applications typically include:

  • Flat heating elements, which are often required for heating up pipes, surfaces or flowing materials (air, liquids).
  • Floor or wall heating elements in aircraft (very lightweight technology)
  • De-icing of areas (e.g. wind turbines, high-rise buildings, pitched roofs)
  • Thermosetting of composite materials
  • Heating of air and other materials
  • Heating of operating tables in medicine
  • Pain-reducing thermal cushions for e.g. for backache
  • Food warming in aeroplanes (IR radiators)

Our CMC product designation is CMC 70010. The material can be slitted, die-cut, laminated with insulation layers that are even thermal conductive and can be coated fitting to your requirements.

 

Kapton® RS is heated up within seconds when set under electrical voltage