This material looks and feels like ordinary Lycra but is highly conductive. It can be cut into narrow strips to form conducting ‘wires’ or can be used as a soft compliant substitute for metal and foil in switches and sensors. Amazingly, its conductivity depends on how tightly it is stretched so if you pull it, the resistance increases (and drops again when stretched very tightly). In a thin strip, the material also warms up when current is passed thus provides the basis of a heated garment or product such as a hat or gloves.
Application tips: Cut out a 25 mm wide x 300 mm long strip and experiment with simple ciruits using crocodile clip leads to get a ‘feel’ for its practical applications. If you connect this strip to a 6v battery, you will be able to feel an appreciable warming effect. (But note: because of the current drain, batteries have a relatively short life when used for heating.)
Resistance = 5 Ω per 100mm. Increasing to 20 Ω when stretched to 150mm in one axis but dropping to 2.5 Ω when stretched at 90º to this. (100 x 1450mm strip)