The natural rubber we usually refer to is a solid material made from natural rubber latex collected from rubber trees and processed through solidification, drying, and other processes. Natural rubber is a natural polymer compound mainly composed of polyisoprene, with a molecular formula of (C5H8) n. Its rubber hydrocarbon (polyisoprene) content is over 90%, and it also contains small amounts of protein, fatty acids, sugar, and ash.

The physical properties of natural rubber. Natural rubber has high elasticity and slight plasticity at room temperature, with excellent mechanical strength, low hysteresis loss, and low heat generation during multiple deformations. Therefore, its flexural flexibility is also good, and because it is non-polar rubber, its electrical insulation performance is good. [1]

Rubber, along with plastic and fiber, is known as one of the three major synthetic materials and is the only polymer material with high stretchability and excellent elasticity. The biggest characteristic of rubber is that its elastic modulus is very small, while its elongation is very high. Secondly, it has excellent breathability and resistance to various chemical media and electrical insulation properties. Some special synthetic rubbers have better oil and temperature resistance, and can resist swelling of fatty oil, lubricating oil, hydraulic oil, fuel oil, and solvent oil; Cold resistance can be as low as -60 ℃ to -80 ℃, and heat resistance can be as high as+180 ℃ to+350 ℃. Rubber is also resistant to various types of bending and deformation due to its low hysteresis loss. The third characteristic of rubber is that it can be combined, blended, and compounded with various materials to modify and achieve good comprehensive performance.