EPDMkumista

EPDM-kumi, or EPDM, is a synthetic rubber formed from ethylene, propylene, and a non-conjugated diene monomer. The diene component enables crosslinking, giving EPDM elastomeric properties while maintaining flexibility over a wide temperature range. EPDM is produced by addition polymerization and can be vulcanized using sulfur or peroxide curing, with the choice affecting elasticity, heat aging, and chemical resistance.

EPDM is renowned for excellent resistance to weathering, ozone, UV light, and aging, as well as good low-temperature flexibility and impermeability to water and steam. It maintains electrical insulating properties and remains stable over a broad temperature span, typically from about -40°C to +120°C (with short excursions above). However, EPDM shows limited resistance to oils, fuels, and many hydrocarbon solvents, and its performance against chemicals depends on the formulation and curing system.

Common applications include roofing membranes, door and window seals, automotive weatherstripping, gaskets, hoses, and electrical insulation components. In construction and automotive contexts, EPDM is valued for long-term durability in outdoor or wet environments and for maintaining elasticity under temperature fluctuations.

Environmental and disposal considerations include the chemical inertness of EPDM in use, but recycling and end-of-life processing can be challenging. Reclamation is possible through devulcanization or mechanical grinding, and reclaimed EPDM is sometimes used in asphalt rubber and other secondary products. Overall, EPDM remains a versatile material for sealing, weatherproofing, and gasket applications where moisture resistance and durability are prioritized.