I need something stretchy like a rubber band for holding things together, but it has to be very creep resistant because it needs to withstand a constant ~50% elongation for at least 3-5 years without significantly changing length/tension. I tried it with natural latex rubber but after only a few months it lost its shape and thus, its tension. Note that I did not protect the rubber latex from oxygen, although it was not exposed to UV and was kept indoors mostly so I'm not sure if that's what caused it.
I'm thinking spandex might be suitable but I'm not sure if its creep resistance is superior to natural rubber. Btw, cost is not a problem.
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