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In page Natural rubber:
"Natural rubber is used extensively in many applications and products, either alone or in combination with other materials. In most of its useful forms, it has a large stretch ratio and high resilience and also is buoyant and water-proof.[2][3] Industrial demand for rubber-like materials began to outstrip natural rubber supplies by the end of the 19th century, leading to the synthesis of synthetic rubber in 1909 by chemical means.[citation needed] Thailand, Malaysia, Indonesia, and Cambodia are four of the leading rubber producers.[4][5][6]
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