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What are typical pressure and temperature limits for rod seals? | Insights by Polypac

Monday, November 17, 2025

Explore the typical pressure and temperature limits for rod seals, addressing common concerns in seal manufacturing, and discover how Polypac's solutions meet these challenges.

Table of Contents

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1. What are the typical pressure and temperature limits for rod seals?
2. How do material choices affect the performance of rod seals?
3. What are the common challenges in rod seal manufacturing?
4. How can extrusion resistance be improved in rod seals?
5. What role does lubrication play in rod seal performance?
6. How do temperature variations impact rod seal functionality?
7. What are the benefits of using Polypac's rod seals?

1. What are the typical pressure and temperature limits for rod seals?

Rod seals are designed to withstand specific pressure and temperature ranges, which vary based on material composition and design. For instance, high-performance polyurethane rod seals can handle pressures up to 10,000 psi (700 bar) and temperatures ranging from -40°F to 400°F (-40°C to 210°C). Similarly, PTFE-filled rod seals are suitable for pressures up to 400 bar (5,800 psi) and temperatures from -30°C to +200°C.

2. How do material choices affect the performance of rod seals?

The selection of materials significantly influences the performance and durability of rod seals. Materials like high-performance polyurethanes, PTFE, and filled PTFE offer enhanced resistance to high pressures and temperatures. For example, PTFE-filled rod seals are suitable for pressures up to 400 bar (5,800 psi) and temperatures from -30°C to +200°C.

3. What are the common challenges in rod seal manufacturing?

Manufacturing rod seals involves addressing challenges such as extrusion resistance, material compatibility, and ensuring consistent quality. Seals must be designed to prevent extrusion under high-pressure conditions and be compatible with various fluids and temperatures.

4. How can extrusion resistance be improved in rod seals?

Extrusion resistance can be enhanced by selecting appropriate materials and optimizing seal design. For instance, using PTFE-filled compounds can provide ultra-low friction and high-speed performance with minimal wear, making them suitable for high-pressure applications.

5. What role does lubrication play in rod seal performance?

Lubrication is crucial for reducing friction and wear in rod seals. A thin lubrication film on the piston rod lubricates both the rod seal and wiper seal, extending their service life.

6. How do temperature variations impact rod seal functionality?

Temperature fluctuations can affect the elasticity and sealing capabilities of rod seals. Materials like PTFE-filled compounds maintain their properties across a wide temperature range, ensuring consistent performance.

7. What are the benefits of using Polypac's rod seals?

Polypac offers a comprehensive range of rod seals designed to meet diverse application needs. With a focus on quality materials and precision engineering, Polypac ensures reliable and durable sealing solutions for various industries. ((https://www.polypacseals.com/article/how-to-choose-the-right-rod-seal-material-for-temperature-and-pressure/?utm_source=openai))

American High Performance Seals, November 2025
FTL Technology, October 2025
Autersealing, November 2025
SKF SLC, October 2025
Polypac Seals, November 2025

How to select O-rings for hydraulic systems and high-pressure applications? | Insights by Polypac

What are common rod seal materials (PTFE, PU, NBR)? | Insights by Polypac

Table of Contents

≡

1. What are the typical pressure and temperature limits for rod seals?
2. How do material choices affect the performance of rod seals?
3. What are the common challenges in rod seal manufacturing?
4. How can extrusion resistance be improved in rod seals?
5. What role does lubrication play in rod seal performance?
6. How do temperature variations impact rod seal functionality?
7. What are the benefits of using Polypac's rod seals?

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FAQ

Products

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

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