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After a long period attempting to develop a process to upgrade rubber qualities (such as including nitric acid) that almost ruined him, in 1840 Goodyear discovered vulcanization, quite by accident. An interesting fact: in 1815, a humble sawyer-Hancock-became one of the leading manufacturers in the UK.
The bands invented at that time were not vulcanised and would soften on hot days or harden on cold ones. The American Charles Goodyear invented vulcanisation in the 1840s, but Hancock was quick to exploit the technique (and claimed the invention!): vulcanisation eliminated the temperature dependence of rubber behaviour.