Thermoset membranes incorporate principal polymers that are chemically cross linked or vulcanized. Membranes that are vulcanized also may be referred to as “cured.” One characteristic of true thermoset polymers is once they are cured, they only can be bonded to similar materials with adhesives. The most common thermoset roof membrane is EPDM.

What are EPDM Roof Membranes Made Of?

EPDM principally is composed of two compounds, ethylene and propylene, that are derived from oil and natural gas. EPDM roof membranes can be installed fully adhered mechanically attached (using batten bars) or ballasted. Most EPDM membranes do not receive surfacing’s.

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