All of my rubber-bands have broken and im mad. I want answers... NAO!!!
Mostly, repeated stressing and destressing causes the polymer strands to separate, weakening the band.
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UV light effects the chains and breaks them down causing the rubber to crack and crumble into molecular dust.
To avoid this keep them out of sunlight in a cool place and apply a natural oil such as castor oil to them to keep the bands supple.
Oh and don't over stretch them.
Rubber has a further odd property in that when you stretch it it gets cooler.
i wish i could pick your answer :D
If they're natural latex, this is the "perishing" that rick' referred to, but they'll oxidise in darkness too. Try to find some synthetic rubber instead. The latex bands are essentially disposable, not intended to last very long. L
The rubber gets old and dries out - it gets brittle and breaks easily. Other times, a small nick or tear will form, and tension on the band causes the tear to grow until it snaps.