Natural rubber comes from nature. In nature, there are as many as 2,000 kinds of plants containing rubber. At present, rubber can be extracted from 500 plants, including dandelion and tall trees - Eucommia ulmoides. But the output is relatively low. Plants that truly meet 98% of the world's industrial milk source have something else. This is the Hevea tree.

The trefoil tree is also called the Brazilian rubber tree, referred to as the rubber tree. It has two major advantages: one is that the trees are tall and contain a lot of glue; the other is that the life is long, and a tree can provide rubber for humans for 30 to 40 years.

More than 1,000 years ago, the rubber tree grew silently in the depths of the Amazonian Amazon in South America. After the bark was cut, the white latex would squat down, like tears. Therefore, in ancient Indian language it is called "the tree that will cry." Columbus discovered the American continent, so he brought the rubber balls played by the Indians back to Europe, letting Westerners know about rubber. Later, the American inventors completely developed rubber vulcanization technology, completely overcoming the ills of rubber products becoming harder in the cold weather and softer in the hot weather. This technology greatly expands the range of applications for rubber.