EPDM (Ethylene Propylene Diene Monomer) rubber washers are highly versatile sealing and spacing components known for their excellent resistance to weathering, ozone, UV radiation, and a wide range of chemicals. Available in various full dimensions and commonly in black or grey, EPDM washers are ideal for outdoor applications and environments exposed to harsh elements. Their key properties ensure a durable and long-lasting seal.

Definition

An EPDM full dimensions rubber washer is a flat, ring-shaped seal precision-cut or molded from Ethylene Propylene Diene Monomer rubber. “Full dimensions” implies that these washers are available in a comprehensive range of standardized (e.g., ASME, DIN) or custom inner diameter (ID), outer diameter (OD), and thickness specifications to suit diverse application requirements. EPDM rubber offers superior resistance to weathering, ozone, UV light, steam, water, and many polar solvents, acids, and alkalis. They are typically produced in black, due to carbon black often used as a reinforcing filler, but can also be found in grey or other colors, often for aesthetic purposes or to indicate specific grades/compounds.

Advantages

• Excellent Weather Resistance: Highly resistant to degradation from sunlight, UV radiation, ozone, and general weathering, making them ideal for outdoor and automotive applications.
• Good Temperature Range: Typically performs well in temperatures ranging from approximately -40°C to +120°C (-40°F to +250°F).
• Water and Steam Resistance: Exhibits very good resistance to hot and cold water, as well as steam.
• Chemical Resistance: Resists many polar solvents, dilute acids, alkalis, ketones, and alcohols. (Note: Not recommended for oils, gasoline, or hydrocarbon solvents).
• Electrical Insulation Properties: EPDM is an excellent electrical insulator.
• Flexibility and Elasticity: Maintains its flexibility and sealing properties over a wide temperature range.
• Durability and Longevity: Known for its long service life, especially in outdoor and demanding environments.
• UV Resistance: Exceptional resistance to ultraviolet light, preventing material degradation and cracking.
• Vibration Damping: Can offer some vibration isolation and cushioning properties.

Applications

• Outdoor Sealing: Ideal for roofing, windows, doors, and facades where exposure to weather elements is constant.
• Automotive Industry: Used in various under-the-hood applications (e.g., coolant systems), exterior seals, and weatherstripping.
• HVAC Systems: Gaskets and seals in air conditioning units, ventilation systems, and ductwork.
• Plumbing and Water Systems: Gaskets in pipe fittings, pumps, and irrigation systems due to excellent water and steam resistance.
• Electrical Enclosures: Sealing electrical boxes and outdoor lighting fixtures to protect against moisture and dust.
• Construction: Used as spacers, seals, and vibration isolators in building structures and architectural applications.
• Appliance Manufacturing: Seals in washing machines, dishwashers, and other appliances involving water.
• Marine Applications: Exterior seals on boats and docks, offering resistance to saltwater and UV.