What are the materials of diaphragm rubber

In industrial applications, one of the core components of a diaphragm pump, a device that can safely and efficiently transport a variety of media, is the diaphragm. The material of the diaphragm has a direct impact on the performance and service life of the pump. In this article, we will introduce several common diaphragm rubber materials, as well as their respective properties and application areas.

EPDM (Ethylene Propylene Monomer)

EPDM is a rubber made from the copolymerization of ethylene, propylene, and a small amount of unconjugated diolefin. It is known for its excellent resistance to aging, chemicals, and water. EPDM separators are widely used in automotive components, building materials, and seals. It is capable of long-term use in temperatures ranging from -40°C to 130°C and has good ozone and UV resistance.

PTFE (Polytetrafluoroethylene)

Polytetrafluoroethylene, also known as "Teflon", is a polymer compound known for its superior corrosion resistance and non-stickiness. PTFE diaphragms are resistant to almost all chemicals, including strong acids and bases. It is also very temperature resistant and can be used in a wide temperature range from -196°C to 260°C. However, PTFE is not resistant to radiation and can be a potential health risk to humans in some cases.

FKM (fluoroelastomer)

Fluoroelastomer is a polymer material containing fluorine atoms, which has excellent weather and chemical resistance. FKM separators are resistant to most organic and inorganic solvents, as well as petroleum-based oils. It retains high mechanical strength at 200°C, but some volumetric deformation may occur. FKM separators are commonly used in the chemical, automotive, and petroleum industries.

NBR (Nitrile Butadiene Rubber)

Nitrile rubber is a synthetic rubber made from the copolymerization of butadiene and acrylonitrile, which is favored for its excellent oil and chemical resistance. NBR diaphragms are suitable for conveying petroleum products, hydraulic fluids, and other oil-based fluids. It has good performance in a temperature range of -20°C to 100°C.

Neoprene

Neoprene is a synthetic rubber polymerized from chloroprene monomer, which has good oil resistance, heat resistance, and aging resistance. It is suitable for the manufacture of diaphragm pump diaphragms, especially in the field of non-corrosive liquid transfer, such as sewage treatment, tap water, or seawater.

Nitrile rubber

Nitrile rubber is similar to neoprene but has better oil and abrasion resistance. It is suitable for conveying petroleum and oil liquids such as leaded gasoline, diesel, hydraulic oil, etc., as well as non-corrosive slurries with large consistency.

Other Materials

In addition to the rubber materials mentioned above, there are also special separator materials such as thermoplastic elastomers (TPEs), polytetrafluoroethylene copolymers (PTFE), and rubber elastomers. These materials offer more selectivity to suit different industrial applications and media characteristics.

Conclusion

Choosing the right diaphragm rubber material is critical to ensuring the performance and reliability of your diaphragm pump. Each material has its own unique performance characteristics and range of applications. When designing and selecting a diaphragm pump, factors such as the chemistry of the medium, the temperature range, the pressure requirements, and the cost-effectiveness need to be taken into account. With the development of materials science, there may be more innovative separator materials in the future to meet the changing needs of industry.