EPDM (APTK)

Ethylene-propylene-Caoutchouc

Polymere from ethylene, propylene and a small portion of dienes.
Good swelling resistance in hot water, vapour, suds, bases, acids and many others.
Elastomeres made from EPDM show a good ozone resistance, are non-aging and are resistant to atmospheric attacks.
 
detailed comparison of materials