Natural rubber is a kind of crystalline rubber with high self-reinforcing function and excellent mechanical strength. Natural rubber has outstanding air tightness. Natural rubber has outstanding alkali resistance and weak acidity. Natural rubber is a solvent-free rubber, which can only resist certain solvents, but it swells in solvent-free and has poor oil resistance and solvent-free properties.

Because natural rubber has outstanding comprehensive functions, it can be used alone as a variety of rubber products, and can also be combined with other rubbers to enhance the functions of other rubbers, such as molding viscosity, tensile strength, etc., thereby improving the functions of rubber products. Natural rubber is suitable for water at room temperature, below 70℃, without corrosive media. According to the medium used, rubber materials are selected, and the flange materials are carbon steel/spheroidal graphite QT450/stainless steel, etc.

The flange on the natural rubber joint is the central equipment that connects the rubber joint with the pipeline and the water pump. In addition, the sealing function of the NR joint is closely related to the flange. In order to prevent flange joint leakage, it is usually necessary to press them together. If the quality is not good, there may be problems without flanges. Therefore, for natural rubber joints, the selection of rubber joint flanges is very important. Natural rubber has a wide range of sources, low price, good resilience, high mechanical strength, and good flexibility. It occupies an appropriate proportion in various rubber-metal bonding materials.