Technical Data

One of our goals was to develop an electrical panel heating as a semi-finished product. CoTexx® Knitted Heating Fabric is the solution for various applications in the field of electrical heating. Accordingly, the required temperatures differ.

 

A sufficient heat transfer from the Knitted Heating Fabric to the surface to be heated is essential for a successful implementation of the panel heating. Because air is a poor conductor of heat, it is recommended for most high temperature applications, to enclose the Knitted Heating Fabric by using a matrix. The matrix improves heat conduction and ensures that the heat flows precisely to the surface to be heated. In addition, the matrix acts as additional electrical insulation and protects against mechanical overloading. Possible matrices are e.g. epoxy resins, silicones or ceramics.

 

The temperature resistance of the isolating lacquer is standard 220 °C. Once the Knitted Heating Fabric is enclosed by the matrix and thereby the litz wires maintain their position, the temperature stability of the system is determined by the temperature stability of the matrix. The highest temperatures occur at the contact surface between the heating wires and the matrix.This heat must be dissipated to avoid overheating the materials in the vicinity of the electrical conductor. The better this is done and the colder the environmental temperature, the higher the achievable heat output per m².

 

Therefore, the values in the following table only represent the characteristics of the Knitted Heating Fabric independent from the surrounding medium.

 

Technical Data for CoTexx® Knitted Heating Fabric (standard widths)
80 mm 100 mm120 mm
strand diameter 50 μm
number of strands per knitted web120
temperature resistance of the isolating lacquer for 20,000 h158 °C
softening temperature of the isolating lacquerapprox. 200 °C
height of knit stitchapprox. 8,5 mm
weight of the knitted meshapprox. 800 g/m²
electrical resistance at 20 °C2,4 Ω/m3,0 Ω/m3,6 Ω/m

 

Please note that the resistances were determined at room temperature. The resistance of PTC materials increases with the temperature according to the following relationship:

The linear temperature coefficient of resistance α is 0,0039 [1/°C] for copper.

Feel free to contact us for further information
hotline: 0800 6677373
telephone: +49(0)8259 8287-81
info@cotexx.com