Aging-Resistant EPDM O-Rings with 70 Shore A Hardness for Weather Stripping and Door Gasket Applications

EPDM O-Rings for Weather Stripping and Door Gasket Applications

EPDM O-rings and round cord used as weather stripping and door gaskets where the seal faces sun, rain, and temperature swings. The ethylene-propylene compound shrugs off UV, ozone, and weather that destroy nitrile and most other rubbers, and it stays flexible enough to compress year after year.

Features

• Resists UV, ozone, and weathering — no cracking outdoors
• Stays flexible in cold for a reliable compression seal
• Compresses to a watertight, dust-tight bead on flat or framed faces
• Available as cord, cut to length, or joined into continuous loops

Applications

Electrical and telecom enclosures, outdoor cabinets, hatch and access-door seals, HVAC panels, marine compartments, and any door or cover exposed to weather where a round-section gasket does the job.

FAQ

Q: Why use an EPDM O-ring for weather stripping instead of a profile gasket?
A: Round EPDM cord compresses into a dependable seal and is cheap and easy to source in many diameters, with no custom extrusion die. For complex outlines a dedicated profile gasket is better, but for straight or simple enclosure seals the O-ring works well.

Q: Will it keep out rain and water?
A: Yes. EPDM resists water and weather and compresses to a watertight bead against a clean, flat, or framed surface. Correct compression and a clean contact face are what make the seal hold.

Q: What temperature range does it handle?
A: -50°C to +150°C. It stays flexible in freezing weather, so it keeps sealing through seasonal cycles outdoors.

Q: Can I cut it to length from cord?
A: Yes. We supply EPDM O-ring cord and cut-to-length sections; ends can be joined with an EPDM-compatible adhesive to make a continuous loop gasket.

Q: Is EPDM safe around oil or fuel?
A: No. EPDM is not compatible with petroleum oils, fuel, or most hydrocarbons. For oily or fuel-exposed door and gasket areas, use NBR or FKM instead.

Q: What hardness should I pick?
A: 70 Shore A is standard and gives a firm seal. Choose 60 Shore A where the door or panel needs a lighter closing force.