PTC rubber is made from polydimethylsiloxane (PDMS) loaded with carbon nanoparticles.The quantum mechanical tunneling effect inside the material is highly temperature dependent.At a specific temperature the quantum mechanical tunneling effect current ceases.The copper is in turn connected to a voltage to provide the electrical field inside the material necessary to trigger the tunneling effect.These heaters will provide high power when they are cold and rapidly heat up themselves to a constant temperature and remain there virtually unaffected by changes in the ambient conditions.
PTC rubber, a material for which the resistivity grows exponentially with increasing temperature up to a temperature where it ceases to conduct electricity. Above this temperature the material is an electrical insulator.
