What is ethylene-propylene rubber?

 

The general term "ethylene-propylene rubber" refers to two different kinds of polymers:

• EPM represents a copolymer from ethylene and propylene monomers; EPM is entirely saturated and therefore requires vulcanization by radiation or products that release free radicals, such as organic peroxides.
  
  
• EPDM denotes a terpolymer based on three monomers: ethylene, propylene and a non-conjugated diene; EPDM grades have a residual unsaturation in the side chains and can therefore be cured with sulfur and accelerators. Its heat resistance is distinctly better than that of Natural Rubber, SBR and Butadiene Rubber

The molecules of both EPM and EPDM have a completely saturated hydrocarbon backbone, through which excellent ozone resistance and very good resistance to heat and oxidation are achieved.

 

Ethylene-propylene rubbers from LANXESS are designed according to the following criteria:

• Mooney viscosity
• Ethylene/propylene ratio
• Diene content
• Oil content and oil type.

 

Buna is a registered trademark in many countries of the world.