An EPDM washer is a sealing washer made from EPDM rubber (Ethylene Propylene Diene Monomer). It's commonly used with screws, bolts, and roofing fasteners to create a waterproof, weather-resistant seal.
✅ What an EPDM Washer Does
Prevents water leaks
Seals out dust and air
Absorbs vibration
Protects metal surfaces (often paired with a metal washer)
🧱 Where EPDM Washers Are Used
Roofing systems (especially metal roofs)
HVAC and plumbing applications
Automotive assemblies
Electrical enclosures
Window and door installations
🔧 Common Structure
Most EPDM washers come as:
All-rubber EPDM washers, or
Bonded washers (metal washer + EPDM rubber on one side)
💡 Why EPDM Is Used
EPDM is ideal because it offers:
Excellent UV resistance
Strong weatherproofing
Great ozone and aging resistance
Wide temperature tolerance (-40°C to +120°C)
Long service life
📌 Summary
An EPDM washer is simply a durable rubber sealing washer used in many installations-especially outdoors-because EPDM withstands weather and aging better than most other rubbers.
