DMS SEALS TECHNOLOGY CO.,LIMITED

The Professional Sealing Solution Supplier(O Ring Suppliers & Oil Seal Manufacturers).

DMS Seals - Hydraulic Seals and Oil Ring Seals Manufacturer & Supplier

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PTFE vs. NBR: Which O-Ring Seal Is Best for Your Application?

2026-09-28

Machine seals play an important role in keeping equipment running safely and efficiently. The right seal helps prevent leaks and protects internal components from damage. One seal failure can cause the entire machine to break down. This may seem like a small issue, but it can lead to serious consequences.

An O-ring seal is one of the simplest parts in any system. It's a simple ring, but it prevents oil, air, gas, and water from escaping.

Demand for these parts grows quickly. The total market value of O-ring seals is estimated at US$14.8 billion in 2023 by IMARC Group. This growth reflects the wide range of applications that rely on the right sealing solution.

The most popular O-ring materials are PTFE and NBR. Let's discuss and compares these two types.

corrosion resistance plastic white virgin pure PTFE o ring

PTFE O-Ring Seal vs. NBR O-Ring: What Is the Difference?

Before comparing performance and specifications, it helps to understand what PTFE and NBR actually are. They are different sealing materials, with distinct properties that affect how their O-rings perform in different applications.

What is an O-Ring Seal Made From PTFE?

PTFE stands for polytetrafluoroethylene. It is a hard plastic material and is typically stiffer than rubber O-rings.

It has a very low coefficient of friction, allowing parts to slide smoothly across its surface. It also offers resistance to a wide range of chemicals, making it suitable for demanding applications.

Engineers use PTFE o ring seals in:

Chemical processing plants
Pumps and valves
High-temperature equipment
Systems where friction must stay low

What Is an NBR O-Ring?

NBR stands for nitrile rubber, also known as Buna-N. It is soft and stretchy, unlike PTFE. An NBR O-ring bends and flexes easily, and it resists petroleum oils very well. This makes it a top pick for oil-based systems.

You will often find NBR O-rings in:

Hydraulic systems
Pneumatic equipment
Automotive fuel and oil lines

PTFE vs. NBR O-Ring: Key Material Properties

Here is a quick side-by-side comparison.

Property	PTFE O-Ring	NBR O-Ring
*Flexibility*	Lower	Higher
*Chemical resistance*	Excellent	Good for common fluids
*Oil resistance*	Excellent	Excellent
*Friction*	Very low	Low
*Temperature resistance*	Very high	Good
*Elasticity*	Low	High
*Typical use*	Chemical, high-heat systems	Hydraulic, automotive systems

Temperature Resistance of PTFE and NBR O-Rings

High temperatures can quickly affect seal performance. The wrong material may crack, harden, or soften when exposed to excessive heat.

PTFE handles heat exceptionally well. Some suppliers rate it from around −185°C up to +232°C, based on published material data. This wide range suits extreme environments.

NBR performs well too, but within a smaller window. The working range in most manufacturer's data is −30°C to 90°C, although temporary excursions can reach 120°C.

Your actual operating temperature matters most. Always check the real conditions your seal will face, not just the general limits.

Chemical and Oil Resistance: Which O-Ring Wins?

Every fluid or chemical reacts differently with rubber and plastic. Picking the wrong seal material can lead to fast leaks.

When to Choose a PTFE O-Ring

PTFE resists nearly every aggressive chemical. It barely reacts with most substances it touches. This makes it a safe pick for tough environments.

Choose a PTFE o ring seal for:

Strong acids and bases
Solvents
High chemical exposure
Low-friction moving parts

When to Choose an NBR O-Ring

NBR handles petroleum products very well. It stays flexible even after long contact with oil. This is why so many hydraulic systems use it.

An NBR o ring is a strong pick for:

Hydraulic fluids
Fuels and grease
General industrial sealing tasks

If your system runs on oil or hydraulic fluid, NBR70/NBR90 nitrile rubber o-ring is built to handle high pressure up to 40 MPa. It suits demanding hydraulic and industrial setups.

Stiff vs. Stretchy: The Installation Factor

Flexibility and friction both affect how well an o ring seal fits and lasts. Each material behaves differently once it is under pressure.

How Flexibility Affects Fit

NBR stretches easily during installation. Its soft, elastic feel makes it forgiving in tight grooves.

A PTFE o ring seal is much stiffer. It needs careful handling when you install it. A rushed fit can crack the ring.

Keep these tips in mind for PTFE:

Warm the ring slightly before fitting, if the manufacturer allows it
Avoid stretching it too far or too fast
Check for nicks or cracks before installing

How Friction Affects Performance

Friction matters most for moving seals. Low friction means less wear over time. An NBR o ring has low friction too, but PTFE goes even lower. This makes PTFE a strong choice for:

Fast-moving parts
Rotating shafts
Systems needing smooth, repeated motion

Why Groove Size Still Matters

Even the best seal fails in the wrong groove. Groove size and design change how well a seal holds up.

Always match the seal to the groove specs from your supplier. This one step prevents most early seal failures.

From Factories to Fuel Lines: Where Each Seal Fits

The right o ring seal shows up in almost every machine you can think of. Where it works best depends on the material.

Common PTFE O-Ring Applications

A PTFE o ring seal handles tough jobs across several industries. You will often find it in:

Chemical process lines transport very corrosive acids and solvents on a regular basis.
High-temperature equipment needs PTFE that is resistant to high temperature.
PTFE is used for seals in pumps and control valves.
Equipment needing very low friction runs smoother with PTFE parts.

Common NBR O-Ring Applications

An NBR o ring fits well in systems that run on oil or fuel. Common uses include:

Hydraulic cylinders and hoses depend on NBR for oil resistance.
Pneumatic tools use NBR to handle constant air pressure.
Automotive engines and fuel systems trust NBR for daily wear.
General factory machinery uses NBR for cost-effective, reliable sealing.

DMS Seals offers O-Ring options in PTFE and NBR, so you can choose the material that suits your operating conditions.

No More Guesswork: Pick the Right Seal

Before you pick an o ring seal, think through your full setup. A few key factors decide which material fits best. Walk through these points first:

Operating temperature affects how the seal holds up over time.
Fluid or chemical exposure changes which material stays safe.
System pressure determines how strong the seal needs to be.
Movement and friction level decide how much wear the seal takes.
Required flexibility affects how easily the seal fits your groove.
Installation conditions affect how careful you must be during setup.
Expected service life helps you judge long-term value.
Sometimes, budget limits your choice to high-quality or standard-quality products.

Quick Decision Guide

Once you consider these factors, choosing the right seal becomes much easier.

Pick a PTFE O-ring seal where chemical resistance, low friction, and heat are your primary considerations.
Select an NBR O-ring where flexibility, oil resistance, and affordability are the main considerations.

Why Choose DMS Seals for O-Ring Solutions?

DMS Seals has supplied o-ring products for more than 13 years. The company works across many industries with different sealing needs.

DMS Seals uses the following materials to manufacture its O-rings:

Nitrile (NBR)
Fluoroelastomer (FKM)
Silicone
Ethylene Propylene Diene Monomer (EPDM)
Hydrogenated Nitrile.

These choices provide a variety of both inexpensive rubber products and more expensive products suitable for difficult applications.

For a low-cost product offering oil resistance, the NBR70/NBR90 nitrile rubber o-ring works well at pressures up to 4.

For chemically demanding jobs, the PTFE-encapsulated silicone o-ring combines PTFE's chemical resistance with a flexible core.

The team also supports custom sizing and material selection. This helps buyers match the right seal to their exact operating conditions.

Wrap Up!

Still wondering which seal will actually hold up in your system? PTFE and NBR both do their job well, just in different conditions. PTFE handles harsh chemicals and high heat with ease.

NBR flexes easily and stands up to oil and hydraulic fluid. The right o ring seal comes down to your real temperature, fluid, and pressure needs, not guesswork. Take a moment to match your setup to the material built for it.

Looking for the right o-ring for your application? Explore DMS Seals' o-ring solutions to find a sealing option built for your needs.

Frequently Asked Questions About PTFE and NBR O-Rings

Is NBR good for hydraulic applications?

NBR is applied to hydraulic applications because it has resistance to the hydraulic fluids based on petroleum, which are commonly used in the industry.