Abstract
Natural rubber is an important manufacturing raw material. It is used primarily in vehicle tyres, but is also contained in many other products including foam articles, tubing, footwear, and belting. It is produced by the tree Hevea brasiliensis, in tropical areas with a well distributed annual rainfall of at least 1800 to 2000 mm (figure 1 and Table 1). It provides the main livelihood of over 22 000 000 persons in these places, and benefits additional workers through its manufacture in industrial countries.
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