Natural rubber is a kind of to gather isoprene as the main component of natural high molecular compound, molecular formula is n (C5H8), a substance is 91% ~ 94% of rubber hydrocarbon (poly (isoprene), the rest for the protein, fatty acid, ash content, the rubber material such as sugar.Natural rubber is the most widely used general-purpose rubber.Rubber obtained from natural rubber production plant.Natural rubber is mainly sold by hevea latex was prepared.