EPDM O-Rings: The Ultimate Selection Guide (2025)

EPDM O-Rings: The Ultimate Selection Guide (2025)

At vælge det rigtige EPDM O-ring is critical to ensure weather resistance, chemical stability, and durability in your sealing application.

EPDM O-rings offer excellent resistance to steam, UV, and weather conditions, ideal for outdoor and water systems.

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Let’s explore how to use EPDM O-rings effectively across industries.

What are EPDM O-rings used for?

EPDM O-rings are made from ethylene propylene diene monomer, which gives them their robust weather and chemical resistance.

De bruges almindeligvis i:

  • Steam and hot water systems
  • Automotive braking and cooling systems
  • Outdoor sealing (HVAC, solar panels)

See all available EPDM sizes

Are EPDM O-rings chemically resistant?

Yes, EPDM’s saturated polymer structure resists oxidation and UV. It's ideal for polar solvents, steam, and weathering.

Medier Modstand
Vand ✅ Fremragende
Damp ✅ Fremragende
UV/Ozone ✅ Fremragende
Oil/Fuel ❌ Dårlig

Need to compare materials? Read the O-ringens grundlæggende guide

Can EPDM O-rings be used outdoors?

Absolutely. EPDM performs extremely well outdoors:

  • Resistant to UV and ozone
  • Doesn’t crack in sunlight
  • Handles temperature swings (-50°C to 150°C)

That’s why they’re often used in rooftop solar panels and HVAC systems.

Compare EPDM to FKM in demanding environments

When should you avoid EPDM O-rings?

Do not use EPDM where oils, fuels, or hydrocarbons are present.

Medier Use EPDM? Better Alternative
Damp ✅ Yes
UV/Weather ✅ Yes
Mineral Oils ❌ Nej NBR O-ringe
Fuels ❌ Nej FKM O-ringe

How to choose the right EPDM O-ring?

Use this 3-step checklist:

  1. Temperaturområde: EPDM works between -50°C and 150°C
  2. Kemisk eksponering: Avoid oils, use in polar solvents, water
  3. Sizing: Measure ID, OD, and CS; verify Shore A hardness

Still comparing with FKM? See our EPDM vs FKM Comparison

Konklusion

EPDM O-rings are your go-to choice for weather, steam, and outdoor sealing—but avoid them in oil-based systems.

Get EPDM O-Rings for your system

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Folk spørger også

1. Are EPDM O-rings safe for drinking water?
Yes, they are non-toxic and suitable for potable water systems.
2. Do EPDM O-rings resist steam?
Absolutely, they are excellent in steam and hot water applications.
3. Can EPDM handle oils or fuel?
No, avoid EPDM with hydrocarbons. Use NBR or FKM instead.
4. Hvor længe holder EPDM O-ringe?
Over 10 years in clean, non-oil environments.
5. Is EPDM UV-resistant?
Yes, it’s ideal for outdoor sealing and solar equipment.
6. What’s the working temperature range?
-50°C to 150°C typically.
7. How do I size an EPDM O-ring?
Measure ID (inner diameter), OD (outer diameter), and cross-section.
8. What Shore hardness is common?
Usually 70 Shore A for general sealing use.

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