Benefits of higher molecular weight

The molecular weight of Buna® EP rubbers can be varied within a relatively wide range during the polymerization. In general, higher molecular weight provides the following properties:

• higher green strength at elevated temperatures
• higher capacity for filler/oil loading
• lower compression set
• better tear resistance

Polymer molecular weight has a substantial influence on the collapse resistance of extrudates at elevated temperatures. This is a property of special importance for the continuous production of extruded products.

Mooney viscosity of EPDM gives an indication of the polymer molecular weight.

 

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