Rubber - Varieties

Varieties

The major commercial source of natural rubber latex is the Pará rubber tree (Hevea brasiliensis), a member of the spurge family, Euphorbiaceae. This species is widely used because it grows well under cultivation and a properly managed tree responds to wounding by producing more latex for several years.

Many other plants produce forms of latex rich in isoprene polymers, though not all produce usable forms of polymer as easily as the Pará rubber latex does; some of them require more elaborate processing to produce anything like usable rubber, and most are more difficult to tap. Some produce other desirable materials, for example gutta-percha (Palaquium gutta) and chicle from Manilkara species. Others that have been commercially exploited, or at least have shown promise as sources of rubber, include the rubber fig (Ficus elastica), Panama rubber tree (Castilla elastica), various spurges (Euphorbia spp.), lettuce (Lactuca species), the related Scorzonera tau-saghyz, various Taraxacum species, including common dandelion (Taraxacum officinale) and Russian dandelion (Taraxacum kok-saghyz), and guayule (Parthenium argentatum). To distinguish the tree-obtained version of natural rubber from the synthetic version, the term gum rubber is sometimes used.

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Other articles related to "varieties":

Hungarian Wine - History
... Over the following centuries, new grape varieties were brought in from Italy and France ... in 1699, the Germanic influence was felt with the introduction of grape varieties such as Blauer Portugieser ... (Kékfrankos) and the Bordeaux varieties in red wine districts, and of Furmint, Muscat and Hárslevelű in Tokaj ...
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... damson developed directly from forms of sloe, perhaps via the round-fruited varieties known as bullaces, and that the cherry plum did not play a role in its parentage ... used to refer to them in English, but many of the English varieties from which the name "damson" was originally taken have both a different typical flavour and pear-shaped (pyriform) appearance compared to ... As time progressed, a distinction developed between the varieties known as "damascenes" and the (usually smaller) types called "damsons", to the degree that by 1891 they were the subject of a ...
Scorpaenidae - Varieties
... General characteristics of family members include a compressed body, ridges and/or spines on the head, one or two spines on the operculum, and three to five spines on the preopercle ... The dorsal fin will have 11 to 17 spines, often long and separated from each other, and the pectoral fins will be well-developed, with 11 to 25 rays ...
Hungarian Wine - Hungarian Grape Varieties
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... The clustered flowers of the acidic varieties are purplish tinted from outside, but the sweet ones are white-yellowish ... The acidic varieties include the Florentine and Diamante citron from Italy, the Greek citron and the Balady citron from Israel ... The sweet varieties include the Corsican and Moroccan citrons ...

Famous quotes containing the word varieties:

    Now there are varieties of gifts, but the same Spirit; and there are varieties of services, but the same Lord; and there are varieties of activities, but it is the same God who activates all of them in everyone.
    Bible: New Testament, 1 Corinthians 12:4-6.