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a week, followed <strong>with</strong> the prices of synthetic rubber.<br />
After that it moved up to $5 per kilo and stays there.<br />
Out of 30 million tons of rubber consumed in worldwide,<br />
natural rubber shares one third of this quantity. Because<br />
of good mechanical properties and good tack properties,<br />
natural rubber is widely used in tire and glove. Natural rubber<br />
had its origin from countries in Latin America. In 1493,<br />
Christopher Columbus brought this product to Europe.<br />
Natural rubber found its commercial value after Mr. Charles<br />
Goodyear discovered the method to cured natural rubber<br />
from thermoplastic to thermosetted rubber by using sulfur<br />
in 1839. In 1976, Henry Wickman brought natural rubber to<br />
plant in Cylon (Sri Lanka), Malaysia, Singapore and Indonesia.<br />
Now-a-day, Thailand, Indonesia and Malaysia are three<br />
largest natural rubber producers <strong>with</strong> two third of natural<br />
rubber production.<br />
Natural rubber and synthetic rubber<br />
Since World War I, rubber had become a strategic<br />
material indispensable to war operations. US and Japanese<br />
Banja Junhasavasdikul, Ph.D.<br />
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