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ETHYLENE PROPYLENE DIENE MONOMER (EPDM).

 

EPDM (Ethylene Propylene Diene Monomer) is an elastomer. It denotes a terpolymer based on three monomers namely ethylene, propylene and a non-conjugated diene.

EPDM finds use as elastomer in several growth oriented application sectors such as automobile, building and construction, wires and cables, etc.

Types of diene

Type Features
Dicyclopentadiene (DCPD) Slow cure rate, foul odour, inexpensive
Ethylidine norbornene (ENB) Fast cure, expensive
Hexadiene (HD) Moderate cure, better heat stability

ENB is used in 90 % of global EPDM production

Form Pellet form or bale form.

Grade EPDM grades have residual unsaturation in the side chains and can therefore be cured with sulfur and accelerators.

Process


EPDM is a synthetic elastomer produced as a copolymer of ethylene and propylene, with small amounts of a pendant diene (double bonds) in order to cross link the material.

The actual abbreviation EPDM conforms to the ASTM nomenclature guidelines as describing an Ethylene Propylene Diene PolyMethylene main chain elastomer.

The pendant diene includes hexadiene, dicyclopentadiene or ethylidene norbornene in the polymer side chain.

EPDM is typically produced by a solution, suspension or vapour-phase process.

Global scenario


Global installed capacity

1.3 million metric tonnes per annum

Global production

1.1 million metric tonnes per annum

Major global producers include the following :

  • Lanxess
  • ExxonMobil Chemical
  • Dow Elastomers
  • Kumho Polychem
  • Mitsui Petrochemical
  • Sumitomo Chemical
  • PetroChina