Choosing between Buna-N and EPDM O-rings is a critical decision for system performance, durability, and cost-efficiency.

Buna-N works best for oil-based systems, while EPDM excels in steam, water, and outdoor environments.

Keep reading for a complete material comparison with real-world examples, performance charts, and selection guidance.

What Are Buna-N and EPDM O-Rings Commonly Used For?

Material selection matters. Different sealing environments require different rubber compositions.

Buna-N fits oil and fuel systems, while EPDM is ideal for heat, weather, and steam exposure.

Buna-N (NBR) offers excellent resistance to petroleum products and is widely used in automotive and hydraulic applications. EPDM, on the other hand, resists steam, heat, UV, and ozone—perfect for outdoor, hot water, or drinking water systems. Here's how they compare:

Свойство	Буна-Н	ЭПДМ
Диапазон температур	-40°C to 121°C	-51°C to 150°C (204°C for steam)
Маслостойкость	Отличный	Бедный
Steam Resistance	Бедный	Отличный
UV/Ozone Resistance	Умеренный	Отличный
Расходы	Ниже	Выше
Типичное использование	Engine and fuel systems	Hot water or steam applications

Which O-Ring Material Is Better for High Temperature Use?

When high temperatures are involved, EPDM is the superior choice.

It withstands up to 150°C normally and even higher in steam applications.

For example, in food processing equipment using steam valves, EPDM offers long-term resistance. You can find options on the Страница продукта EPDM O-Ring.

Is Buna-N More Suitable for Oil and Fuel Resistance?

Yes, Buna-N is specifically engineered to handle petroleum-based fluids.

It's a popular choice for motor oil, diesel, and hydraulic systems due to its stability in such environments.

Check out Нитриловые уплотнительные кольца for affordable, oil-resistant sealing solutions.

Can EPDM O-Rings Handle Chloramine and Outdoor Exposure?

Absolutely. EPDM’s strength lies in its ability to resist UV, ozone, and chloramine.

This makes it ideal for drinking water systems, solar equipment, or outdoor valves.

Compared to a general-purpose O-Ring Seal, EPDM is built for more aggressive weather conditions.

How Do Costs Compare Between Buna-N and EPDM?

Buna-N is generally cheaper, making it suitable for cost-sensitive bulk applications.

However, EPDM often offers longer service life under harsh conditions, balancing the upfront cost with long-term value.

For multi-material options, consider the Комплект уплотнительных колец.

How Should You Choose Between Buna-N and EPDM?

Ask yourself:

• What fluids or gases will be sealed?
• Will the seal face high temperatures or UV/ozone exposure?
• Is chloramine resistance required for potable water use?
• What’s your cost vs. durability priority?

When in doubt, contact us for tailored material recommendations based on your system specs.

Заключение

Choose Buna-N for oil-based applications; choose EPDM for water, heat, and weather resistance.

Find the Right Seal Material Without Guessing

📩 Электронная почта: [email protected]
📞 WhatsApp: +86 17622979498

Related post

• Сравнение уплотнительных колец FKM и NBR
• EPDM vs FKM Full Analysis
• Buna vs Nitrile: What's the Difference?
• Silicone vs Buna-N O-Ring Guide

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