Polymer and vulcanizate properties of EPM and EPDM rubbers

 
The ethylene/propylene ratio, the diene content, the molecular weight and the oil content are the principal factors influencing the properties of Buna® EP.
The Buna® EP product range comprises three main groups:

• Amorphous EPM/EPDM polymers containing approximately equal amounts of ethylene and propylene; the monomer units are randomly distributed along the polymer chains.
• EPM/EPDM block polymers with an increased proportion of ethylene; some of the ethylene forms small blocks within the polymer chain; consequently, these polymers have a partially crystalline structure.
• Oil-extended grades include both of the aforementioned groups.

Within these three groups, the polymers have different diene contents and molecular weights. All LANXESS EPM/EPDM grades contain a non-staining stabilizer.
General features of Buna® EP compounds are provided _here.

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