EPDM
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
Properties
EPDM elastomers have excellent heat, ozone/weathering, and aging resistance. They also exhibit excellent electrical insulation, compression set, and low temperature properties, but only fair physical strength properties. Their resistance to chemicals is generally good. EPDMs are probably the most water resistant rubbers available. However, they are not compatible with mineral and synthetic di-ester lubricants, and hydrocarbon fuels and solvents. They also have poor flame resistance.
Applications
EPDM is used as a cheaper alternative to silicone rubber for parts that will have a lot of outdoor or moisture exposure, or for electrical insulation. However it can also be used as roofing or liners. It’s mainly used in four industries:
- • Automotive. This is EPDM’s most common application, thanks to its flexibility, resiliency, and weatherability. It can be found in vehicle weather stripping, seals, sealant, wire and cable harnesses, and brake systems. It’s also blended with other materials to make fender extensions, rub strips, and car bumpers.
- • Industrial. Industrial applications use EPDM for its electrically insulating and waterproof properties, as well as its resilience and flexibility. EPDM can be found in parts such as water system O-rings, hoses, and gaskets, as well as in electrical insulators and connectors for wire and cable. It also takes the form of accumulator bladders, diaphragms, grommets, and belts.
- • Construction. Thanks to its insulating, weatherproof, and waterproof capabilities, roofing is a major application for EPDM. However it is also used for sealant, expansion joints, garage door seals, pool and tank liners, and waterproof coating for bitumen roofs. It’s even used on RV roofs.
- • HVAC. In this industry EPDM takes the form of grommets, tubing, gaskets, seals, and insulation, thanks to its weatherability and temperature resistance.
TECHNICAL DATA SHEET
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