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Natural rubber is an elastic hydrocarbon polymer that naturally occurs as a milky colloidal suspension, or latex, in the sap of some plants. It is used extensively in many applications and products. It can also be synthesized. The entropy model of rubber was developed in 1934 by Werner Kuhn. The scientific name for the rubber tree commercially used to obtain natural rubber is Hevea brasiliensis.


Varieties
The major commercial source of natural rubber latex is the Para rubber tree, Hevea brasiliensis (Euphorbiaceae). This is largely because it responds to wounding by producing more latex.

Other plants containing latex include figs (Ficus elastica), Castilla (Panama rubber tree), euphorbias, lettuce, the common dandelion, Taraxacum kok-saghyz (Russian dandelion), Scorzonera tau-saghyz, and Guayule. Although these have not been major sources of rubber, Germany attempted to use some of these during World War II when it was cut off from rubber supplies[citation needed]. These attempts were later supplanted by the development of synthetic rubber. To distinguish the tree-obtained version of natural rubber from the synthetic version, the term gum rubber is sometimes used.