epdm

As a noun elastomer

is elastomer.

As an initialism epdm is

ethylene propylene diene terpolymer.

As a noun neoprene

is a synthetic rubber, a polymer of chloroprene, commonly used in wetsuits, laptop sleeves, orthopedic braces, electrical insulation, liquid and sheet-applied elastomeric membranes and flashings, car fan belts, etc.

As an initialism epdm is

ethylene propylene diene terpolymer.

As a noun rubber

is (uncountable) pliable material derived from the sap of the rubber tree; a hydrocarbon polymer of isoprene or rubber can be (sports) a series of an odd number of games or matches of which a majority must be won (thus precluding a tie), especially a match consisting of the best of a series of three games in bridge or whist.

As a verb rubber

is to eavesdrop on a telephone call.

As an initialism epdm is

ethylene propylene diene terpolymer.