EPDM rubber ( ethylene propylene diene monomer rubber ), a type of synthetic rubber, is an elastomer characterized by various applications. This is an M-Class rubber in which 'M' in M-Class refers to its classification in the ASTM D-1418 standard; class M including rubber having saturated chain of polyethylene type. Dienes used in the manufacture of EPDM rubber are dicyclopentadiene (DCPD), ethylidene norbornene (ENB), and vinyl norbornene (VNB). EPDM rubber is closely related to ethylene propylene rubber: ethylene propylene rubber is an ethylene and propylene copolymer, whereas EPDM rubber is terpolymerized from ethylene, propylene, and diene components.
Ethylene content is about 45% to 85%. The higher the ethylene content, the higher the likelihood of polymer loading, better mixing, and extrusion. This polymeric pickling peroxide provides a higher cross-density than the amorphous pair. Amorphous polymers are also excellent in processing. The ability of the process is strongly influenced by its molecular structure. Dienes, typically comprising 2.5% to 12% by weight of the composition, serve as sites of cross link when heals with sulfur and resin; with the peroxide drug, the diene (or the third monomer) acts as a coagee, which provides unexpected resistance to stickiness, creep, or flow during end use.
Video EPDM rubber
Properties
EPDM is compatible with polar substances, e.g. fire resistant hydro fluids, ketones, hot and cold water, and alkali. This is not compatible with most hydrocarbons, such as oil, kerosene, aromatics, gasoline, and halogenated solvents. EPDM shows exceptional resistance to heat, ozone, steam and weather. This is an electrical insulator.
The peculiar nature of EPDM vulcanizates is given below. EPDM can be aggravated to meet certain properties to some extent, depending on the available EPDM polymers, then the processing methods and preservation processes used. EPDM is available in a variety of molecular weights (shown in terms of Mooney ML density (1 4) at 125 ° C), various levels of ethylene, third monomer, and oil content.
Maps EPDM rubber
Usage
Common uses are in the vehicle: door seals, window seals, rod seals, and occasional hood covers. Often, this seal is the source of noise due to movement of the door to the car body and the friction produced between EPDM rubber and the mating surface (painted metal or glass sheets). This noise can be reduced by the use of special coatings applied during the manufacture of weather seals. Such layers can also improve chemical resistance of EPDM rubber. Some vehicle manufacturers also recommend lightweight applications of dielectric grease silicon to weatherstripping weath to reduce noise. Other uses in the vehicle include a cooling system circuit hose in which the water pump, thermostat, EGR valve, EGR cooler, heater, oil cooler, radiator, and vacuum bottle are connected to the EPDM hose, as well as a charge air pipe on a turbocharged engine to connect the cool side of the air conditioner charge (intercooler) to the intake manifold.
EPDM rubber is used in seals (for example, used in cold room doors as it is an insulator, as well as in the face seal of industrial respirators in an automotive spray paint environment.EPDM is also used in glass-operated ducts, radiators, gardens and hose tools, tubes, ponds, washing machines, belts, electrical insulation, vibrators, O-rings, solar panel heat collectors, and conical speakers surround.
It is also used as a medium for water resistance in power cable connections, roofing membranes (because it does not pollute run-off rainwater, which is essential for rainwater harvesting), geomembranes, rubber mechanical goods, plastic impact modifications, thermoplastics, vulcanizates, and many applications others. EPDM colored granules are mixed with polyurethane binder and sprayed or sprayed onto concrete, asphalt, filtration, interlocking bricks, wood, etc. To create a non-slippery, soft, and porous safety surface for wet deck areas such as pool deck and as a bottom surface safety play playing equipment (designed to help reduce fall injuries).
References
Source of the article : Wikipedia
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