EPDM
Ethylene Propylene Diene Monomer
Glass Transition (Tg)
-55 to -45 °C
Melting Point (Tm)
—
Density
0.86 g/cm³
CAS Number
25038-36-2
Recycling Code
None
Category
Elastomer
Repeat Unit
–[CH₂–CH₂]ₓ–[CH₂–CH(CH₃)]ᵧ–[diene]𝑧–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Saturated backbone gives outstanding ozone, weather and steam resistance; excellent electrical insulation; poor resistance to mineral oils.
Applications
Automotive weatherseals, roofing membranes, radiator hoses, cable insulation.