Our Technical Advices

How does the Carbon and metal wires conductivity compares in relation with temperature increase ? 

The evolution of electrical conductivity of metal and carbon are different with temeprature increase

☉  At the opposite of carbon yarns, metallic electro heating wires generally have a resistivity that increases with temperature, giving them a slight regulating effect at high températures.

☉  Carbon wires have their resistivity that decreases with temperature! At rather high températures, this may induce an acceleration of the damage through eventual hot spots​.

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Compare carbon and metallic wires on the chart hereunder !

• As for an example , for high temperature heating applications, the slightest difference of structure or damaged heating mat or wire will concentrate the current in this small zone, that becomes more and more conductive