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RUBBER Natural Rubber NR. (Hevea, rubber, natural cis-polyisoprene) (slide 1) I'm going to talk to you about rubber, I'll talk about natural rubber first and then go on to talk about the way in which its natural state can be modified and manipulated so its advantageous properties can be used. (slide 2) Natural rubber is an excellent engineering material and is used as the main material in many everyday items the most prevalent being car tires which I'll discuss later also. (slide 3) Natural rubber is obtained from the milky white fluid called latex, found in many plants however synthetic rubbers are produced from unsaturated hydrocarbons (basically this means that there are carbon atoms in the rubber molecule that have a potential to be bonded to more hydrogen. Latex is a milky fluid found in specialized cells, called lactiferous cells. To gather the latex from plantation trees, a diagonal cut angled downward is made through the...

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