REI store or online
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REI store or online
Yes, the rubber in the shock cord will show a permanent set if moderate loads are applied for a long time. The same happens under compression, so you don't want to leave the cord with any tight knots.
Stretch rubber too much and the modulus increases, so it is more likely to snap than yield.
Good question. The key property is "glass transition temperature", where the rubber becomes leathery, and this varies significantly between different rubbers. I am putting a sample of the shock cord I use in the freezer right now.....