American Inventor Was discovered by accident in the year 2382 (1839) and discovered that the rubber sole. Unable to withstand the weather was. And they bring in natural rubber (NR) mixed with sulfur and lead, then played with fire. By sulfur to create covalent bond between rubber molecules. It is a flexible rubber. Stability at different temperatures withstand heat and sunlight. Solute and solvent even more difficult. This reaction is called vulcanization process. (Vulcanization) the tire that we use to this day.
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