Due to the property of the material to stretch, the substrate can increase by 2.5 times, and then return to its original state. Also, the resin has a thermosetting property. This means that it only reacts once to the thermal effect during manufacture. Further heating will not melt it.
The ability to withstand such stresses and the subsequent “respite” is explained by a special three-dimensional “crosslinked” structure of the resin, which distributes the mechanical load evenly. For comparison, most of the rubbers lose their properties after several stretches.
Conducting electrodes are made of a layer of carbon nanotubes , “adhered” to the resin. Unlike indium and tin, the nanotube material does not crack and does not lose electrical conductivity.
Samples of electrodes for circuits are made of a paste consisting of the same polymer as the substrate, only mixed with silver. This explains the resistance to mechanical deformation and the conservation of conductivity.