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From Wickipedia -
History of vulcanization of rubber
Although vulcanization is a 19th century invention, the history of rubber cured by other means goes back to prehistoric times. The name "Olmec" means "rubber people" in the Aztec language. Ancient Mesoamericans, spanning from ancient Olmecs to Aztecs, extracted latex from Castilla elastica, a type of rubber tree in the area. The juice of a local vine, Ipomoea alba, was then mixed with this latex to create processed rubber as early as 1600 BC.[4] In the western world, rubber remained a curiosity, although it was used to produce waterproofed products such as Mackintosh rainwear.
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