Natural rubber comes from Hevea rubber tree supplying a lot of commercial rubber. When it is injured, it secretes a lot of sap rich in rubber emulsion. In addition, fig trees and some plants of the Euphorbia family can also supply rubber.

During the World War, Germany had tried to obtain rubber from these plants because the supply of rubber was blocked, but it was later changed to produce artificial rubber. In the beginning, rubber trees were good at growing in South America, but through artificial transplantation, many rubber trees are now also planted in Southeast Asia.

In fact, Asia has become an important source of rubber. Rubber made of guayule gum can reduce sensitivity. Other rubber-related materials Although more than half of the rubber is artificial, natural rubber is still very important in some fields, such as automobiles and military industries.