Ethylene Propylene Diene Monomer
EPDM rubber (ethylene propylene diene monomer (M-class) rubber), is an elastomer which is characterized by a wide range of applications.
The M refers to its classification in ASTM standard D-1418. The M class includes rubbers that have a saturated chain of the polymethylene type.
The ethylene content is around 45% to 75%. The higher the ethylene content the higher the loading possibilities of the polymer. As a result better mixing and extrusion.
Peroxide curing these polymers give a higher crosslink density. This is very much influenced by their molecular structure. The dienes, typically comprising from 2.5% up to 12% by weight of the composition, serve as crosslinks when curing with sulphur and resin, with peroxide cures the diene functions as a coagent, which provide resistance to unwanted tackiness, creep or flow during end use.
EPDM exhibits satisfactory compatibility with fireproof hydraulic fluids, ketones, hot and cold water, and alkalis, while unsatisfactory compatibility with most oils, gasoline, kerosene, aromatic and aliphatic hydrocarbons, halogenated solvents and concentrated acids.
The main properties of EPDM are its outstanding heat, ozone and weather resistance. The resistance to polar substances and steam are also good. In addition it has excellent electrical insulating properties.
Used in almost all types of applications as a universal material, suitable both in cleaning and sterilization processes. Typical applications are filling, dispensing, pumps, pipe and flange gaskets, valves, quick connectors, tanks, separators, homogenizers, decanters and heat exchangers. The most common use, however, is probably in vehicles. EPDM is used in door and window seals, boot seals, and also bonnet seals.
Available products include O-Rings, Square Seals and Kantseals. Also Flat Seals, Gaskets, Diaphragms, and reinforced. EPDM has the ability to be bonded to other materials and delivered as engineered parts in almost any design.