The origin of rubber and the composition of rubber sheet

According to the documents, the balls were so elastic that the visiting Spaniards thought they were possessed by evil spirits. Rubber is also used as a strap to tie wooden handles to stones or metal appliances, and as a filler for handles.
Maya can use rubber to make shoes. Although Native Americans do not formally vulcanize rubber as modern humans do, they can still use organic substances to achieve similar effects, such as mixing unprocessed emulsions with sap from different varieties of trees or some vines.
Some indigenous people in Brazil use rubber to make waterproof fabrics. It has been reported that Portuguese brought these clothes back to their homeland, frightened their fellow citizens, and were accused of witchcraft and tried.
When rubber was introduced into England, it was found that this material can wipe away the traces left by the pencil effectively. So today, rubber rubber is also used to describe eraser. Interestingly, today's Americans are used to eraser erasers, but rubber is used to describe condoms.
Natural rubber origin clover provides the most commercial rubber. It produces a lot of sap that is rich in latex when it hurts. In addition, fig trees and some Euphorbia Plants also provide rubber.
Germany was tested for rubber from these plants during World War II, when supplies of rubber were blocked, but then artificial rubber was produced. Originally native to South America, rubber trees are now planted in Southeast Asia through artificial transplantation.
In fact, Asia has become the most important source of rubber. The rubber made from Chrysanthemum gum can be reduced sensitively. Other materials about rubber, although more than half of rubber is now manufactured, are still important in some areas, such as automotive and military industries.