Hi all. I'm trying to find a durable elastic material for a project of mine but I can't seem to find the needed information. Basicly what I need is a elastic/rubber band that can withstand at least 100 000 (or preferably over 1 million) stretch cycles without its resting length increasing more than a few percent. In my device I have a rubber band that is 100mm long that gets stretched to 170mm in each cycle and if its resting length increases more than 2.5mm then the device will cease to function. I'm aiming for at least 100 000 stretch cycles and a temperature range between -15 and +35 celsius with the resting length staying inside -2.5 and +2.5mm. Are there any materials that can handle this? Thanks!