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

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

Elektante la ĝustan 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.

Ili estas ofte uzataj en:

  • 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.

Amaskomunikilaro Rezisto
Akvo ✅ Bonega
Vaporo ✅ Bonega
UV/Ozone ✅ Bonega
Oil/Fuel ❌ Malriĉa

Need to compare materials? Read the O-ringo-fundamenta gvidilo

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.

Amaskomunikilaro Use EPDM? Better Alternative
Vaporo ✅ Jes
UV/Weather ✅ Jes
Mineral Oils ❌ Ne NBR O-ringoj
Fuels ❌ Ne FKM O-ringoj

How to choose the right EPDM O-ring?

Use this 3-step checklist:

  1. Temperaturgamo: EPDM works between -50°C and 150°C
  2. Kemia Ekspozicio: 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

Konkludo

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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Homoj Ankaŭ Demandas

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. Kiom longe daŭras EPDM-O-ringoj?
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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