In the oil, gas, offshore, and subsea industries, O-rings may be small components, but they perform a critical role in maintaining the integrity of high-value equipment. These elastomer seals operate in some of the world's harshest environments, where they are exposed to extreme and fluctuating pressures, wide temperature ranges, aggressive hydrocarbons, chemical injection fluids, and sour gas containing hydrogen sulphide (H₂S).

Failure of a single O-ring can lead to loss of containment, unplanned downtime, environmental incidents, costly repairs, and serious safety risks. As a result, operators and equipment manufacturers rely on internationally recognised standards and material qualification programmes to ensure sealing reliability throughout the life of an asset.

Understanding offshore O-ring standards and certification requirements is essential for engineers, procurement professionals, maintenance teams, and project managers responsible for specifying sealing solutions in demanding oil and gas applications.

Why O-Ring Certification Matters in Offshore and Subsea Environments

Offshore and subsea equipment places significant demands on elastomer materials. Certified O-rings provide confidence that the seal material has been tested and qualified to perform under the conditions it will encounter in service.

Using qualified sealing materials helps ensure:

• Reliable sealing under high pressures and challenging temperatures
• Resistance to sour gas (H₂S), hydrocarbons, and aggressive chemicals
• Compliance with operator, project, and regulatory requirements
• Consistent manufacturing quality and material traceability
• Reduced maintenance costs and lower lifecycle risk

Ensuring you use certified O-rings is a risk management strategy, not just a regulatory requirement.

NORSOK Standards: M-710 & M-711 for Offshore Elastomers

Developed by the Norwegian petroleum industry, NORSOK standards were created to improve safety, reliability, and cost efficiency across the Norwegian Continental Shelf. Today, NORSOK standards are widely specified throughout global offshore and subsea projects and are often regarded as the benchmark for elastomer qualification.

While NORSOK compliance is not legally required outside Norway, many operators and equipment manufacturers specify NORSOK-qualified materials as part of their technical requirements. In practice, this can make compliance essential for participation in offshore projects worldwide.

It is important to understand that NORSOK standards qualify elastomer compounds rather than individual O-rings. To maintain compliance, manufacturers must produce seals using approved formulations, controlled manufacturing processes, and full batch traceability.

Key Points:

• NORSOK is not legally required outside Norway, but operators often treat it as mandatory.
• NORSOK standards focus on compound qualification, not individual O-rings.
• Approved elastomer compounds must be manufactured with controlled processes and full traceability to maintain compliance.

Scope of NORSOK Elastomer Standards

NORSOK M-710 remains one of the most widely specified qualification standards for elastomer materials used in offshore and subsea sealing applications, particularly where long-term reliability is critical.

Global Use of Offshore Elastomer Standards

While NORSOK standards originated in Norway, offshore operators worldwide often specify a combination of NORSOK, NACE, API, and ISO requirements depending on project location and operating conditions.

Understanding which standards apply to a project is a crucial part of selecting suitable offshore O-rings and sealing materials.

AED & RGD Testing for High-Pressure Elastomers

One of the most important considerations for offshore and subsea elastomers is resistance to rapid gas decompression (RGD), sometimes referred to as explosive decompression.

When an elastomer is exposed to high-pressure gas, molecules can permeate into the material. If pressure is released too quickly, the trapped gas expands faster than it can escape, causing internal cracking, blistering, or catastrophic seal damage.

AED/RGD resistance is particularly important in:

• High-pressure valves
• Subsea connectors
• Production manifolds
• Gas compressors
• Blowout preventers (BOPs)
• Downhole completion tools

Because pressure cycling is unavoidable in these applications, AED/RGD-qualified O-rings are often considered essential for long-term reliability.

NACE TM0187 for Sour Service

Hydrogen sulphide (H₂S) presents one of the most aggressive environments encountered in oil and gas production. Exposure to sour gas can accelerate elastomer degradation, resulting in swelling, embrittlement, cracking, and premature seal failure.

NACE TM0187, provides internationally recognised guidance for material selection in H₂S-containing environments. Compliance helps ensure sealing materials maintain their performance and integrity throughout service life.

Typical Applications Requiring NACE Compliance

While NORSOK focuses on overall offshore elastomer qualification, NACE specifically addresses material performance in sour service environments.

O-Ring Material Selection and Certification

Selecting the correct O-ring material involves far more than choosing a polymer family. Performance depends on the complete compound formulation, including fillers, curing systems, and manufacturing controls.

As a result, generic material descriptions alone are insufficient when specifying O-rings for offshore, subsea, or sour service applications.

Elastomer Materials Availability. 

For demanding offshore applications, HNBR, FKM, and FFKM compounds are among the most frequently specified materials due to their ability to satisfy multiple qualification requirements simultaneously.

Material	NORSOK	AED / RGD	NACE	Typical Use	Notes
HNBR	✓	✓	✓	Oil & gas, sour service	Widely used in high-pressure sour applications
FKM (Viton)	✓	✓	✓	High-temp hydrocarbons	Select compound grades only
Aflas	✓	✓	✓	Sour gas wells, high-pressure gas systems, chemical injection systems	Excellent resistance to H₂S
FFKM	✓	✓		Extreme chemicals & temperature	Often used in critical subsea applications

Only compounds that have passed recognised tests, should be used for these applications, contact Polymax to ensure you are selecting a certified compound.

Choosing the Right O-Rings

When specifying O-rings for offshore, subsea, and sour service environments, it is important to evaluate both the application conditions and the certification requirements.

Before selecting a sealing material, consider:

• Required standards and project specifications, including NORSOK M-710, M-711, NACE TM0187, & TM0297.
• Operating pressures and temperature ranges
• Exposure to hydrocarbons, production chemicals, and sour gas
• AED/RGD resistance requirements
• Material certification and traceability documentation
• Long-term reliability and maintenance considerations

Selecting the correct offshore O-ring requires more than matching material types. Certification status, pressure profile, temperature range, chemical exposure, and sour service requirements all influence sealing performance and operational reliability.

Our technical team can help identify compliant NORSOK, AED/RGD-resistant, and NACE-compliant O-ring solutions for your application. Contact us on +44 (0) 1420 474 123 or email us for expert technical guidance.

What is Compression Set?

Compression set occurs when an elastomer undergoes permanent deformation and fails to fully recover its original shape after being subjected to prolonged compression. In sealing applications, this loss of elasticity can significantly reduce sealing performance and increase the risk of leakage.

A common example is an O-ring that remains flattened after extended service. As the material loses its ability to rebound, the sealing force decreases, making compression set one of the leading causes of O-ring failure. Understanding what causes compression set and how to minimise it is essential when selecting seals for long-term reliability.

How is Compression Set Measured?

Compression set is a measure of an elastomer's ability to recover after being compressed for a specified period of time. It is commonly evaluated using the ASTM D395 testing standard, which measures the permanent deformation that remains after the compressive load has been removed.

During testing, the elastomer is compressed by a specified percentage, typically 25% of its original thickness for a defined period and temperature. Once the load is removed, the material is allowed to recover before its final thickness is measured.

The result is expressed as the percentage of the original deformation that has not recovered. Lower compression set values indicate better elastic recovery and generally provide improved long-term sealing performance.

Compression Set Formula for O-rings

Compression Set (%) = ((T₀ − Tᶠ) / (T₀ − Tc)) × 100 

Where:

• T₀ = Original O-ring cross-sectional thickness
• Tᶠ = Final thickness after testing
• Tc = Thickness under compression

Causes of Compression Set

Compression set can develop due to several factors, often acting together over time. Common causes include:

Inadequate Heat Resistance

Exposure to elevated temperatures can accelerate the breakdown of elastomer properties, reducing the material's ability to recover after compression. Selecting high-temperature materials such as FKM (Viton®) or silicone can help maintain elasticity in demanding environments.

Poor Compression Set Performance

Different elastomers exhibit varying resistance to permanent deformation. Materials with naturally lower compression set characteristics, such as EPDM and FKM, are often preferred for applications requiring long service life.

Excessive O-ring Squeeze

Applying too much compression during installation places additional stress on the elastomer and can accelerate permanent deformation. Recommended squeeze levels are typically:

• Static seals: 15–30%
• Dynamic seals: 8–16%

Following established gland design guidelines helps optimise sealing performance while minimising compression set.

Chemical Degradation

Exposure to incompatible chemicals can alter the molecular structure of an elastomer, leading to hardening, softening, swelling, or permanent deformation. Ensuring material compatibility with the media being sealed is essential for long-term reliability.

Factors Affecting Compression Set

Shore Hardness (ShA)

Shore hardness influences how readily an elastomer deforms under load. Softer materials, such as 50 ShA silicone, generally compress more easily and may exhibit higher compression set values. Harder materials, such as 75 ShA FKM, tend to resist deformation more effectively and often provide improved compression set performance.

Selecting the correct hardness helps balance sealing effectiveness, installation requirements, and long-term durability.

O-ring Size

Correct O-ring sizing plays an important role in maintaining seal integrity and reducing compression set. The cross-sectional thickness and gland dimensions determine the amount of squeeze applied during installation.

Thicker O-rings may experience greater compression, increasing the risk of permanent deformation. Conversely, O-rings that are too thin may not generate sufficient sealing force. Oversized O-rings can also experience excessive installation stress, which may affect service life.

Compression Set Performance of Common O-rings Materials

Different elastomer compounds exhibit varying levels of compression set resistance. While application requirements such as temperature, chemical compatibility, and hardness should always be considered, the table below provides a general comparison of common O-ring materials and their typical compression set performance.

Why is Compression Set Important When Selecting an O-ring?

O-rings function by maintaining continuous contact between the sealing surfaces and the gland. To achieve this, the elastomer is compressed during installation, creating the sealing force required to prevent leakage.

Over time, heat, pressure, and chemical exposure can alter the polymer structure of the material. As elasticity decreases, the O-ring becomes less capable of returning to its original shape, reducing the sealing force available within the assembly.

For this reason, compression set should be considered alongside chemical compatibility, temperature resistance, and hardness during material selection. Choosing an elastomer with good compression set resistance helps prevent premature seal failure, reduce maintenance costs, and improve long-term system reliability.

In critical applications such as hydraulic systems, chemical processing equipment, and industrial machinery, compression set is often one of the most important indicators of long-term sealing performance.

Need Help Call +44 (0)1420 474123 or e-mail us. We're here to help you find the perfect solution for reliable, long-lasting sealing.

Choosing the right O-ring involves more than just size and material. One of the most critical but often overlooked factors is the material hardness. This indicates how soft or firm a rubber compound is, influencing how well the O-ring seals, resists pressure, and performs in real-world conditions.

For most O-ring applications, Shore A hardness (abbreviated ShA or HA) is the primary scale used. However, understanding how different Shore scales work provides important context for making the best choice.

What Is Shore Hardness?

Shore hardness is a measure of how resistant a material is to indentation, indicating how soft or hard it is on a standardised scale. It is determined using a device called a durometer, which applies a standardised force to a material and measures its resistance to indentation. The result is a numerical value that helps compare the hardness of different materials.

Overview of Shore Hardness Scales

There are several Shore scales, but the most commonly used for polymers and elastomers are:

• Shore A (ShA or HA): Used for soft, flexible materials like rubber, silicone, and other elastomers. This is the standard scale for O-rings. The scale ranges from 0 (very soft) to 100 (very hard). For example, a 70 ShA O-ring offers a balance of flexibility and durability.
• Shore D (ShD or HD): Designed for harder plastics such as nylon, polycarbonate, and rigid thermoplastics. Shore D is not used for standard rubber O-rings, but may be referenced for rigid back-up rings (PTFE) or non-elastomeric sealing components.
• Shore 00: Less common in O-ring applications, Shore 00 is used for very soft gels or foams, like sponge rubber or soft silicone gels.

Which Shore A Hardness Rating is Best for your Application

The Shore A hardness rating of an O-ring has a direct impact on its ability to seal, resist deformation, and withstand pressure. As a guide what rating should you use for different applications.

• Soft O-rings (40–60 ShA): Highly flexible, excellent for low-pressure applications or when sealing against rough or uneven surfaces. However, they may wear more quickly and be prone to extrusion under high pressure.
• Medium O-rings (70 ShA): The most commonly used hardness for O-rings, striking a balance between elasticity and strength. Suitable for both dynamic and static sealing in hydraulics and pneumatics.
• Hard O-rings (80–90 ShA): Best for high-pressure environments. These O-rings are more resistant to extrusion and abrasion but require smooth sealing surfaces and higher installation force.

Reduce Cost and Downtime by Getting your Selection Right

Understanding the Shore Hardness scale, especially Shore A (ShA) for elastomers, is essential for selecting the right O-ring. By matching the material hardness to your application's requirements, you can ensure a more reliable, longer-lasting seal that minimises downtime and maintenance.  To find out more contact our team of experts.

Ensuring food-contact O-rings, seals, gaskets, and silicone tubing are safe and compliant is essential for manufacturers, installers, and end-users operating in the United States, European Union, and global food-processing markets.

Regulatory compliance helps:

• Protect consumer health
• Reduce contamination risk
• Ensure export-ready certification
• Support hygienic design standards in processing systems

This guide compares the three most important frameworks for food-contact elastomers and sealing components:

• FDA 21 CFR (U.S.) – focuses on ingredient safety, extractable limits, and migration testing.
• EC 1935/2004 (EU) – prioritises migration limits, traceability, and documentation.
• 3-A Sanitary Standards (3-A SSI) – ensures hygienic design, cleanability, and bacterial prevention in equipment.

Achieving FDA and EC 1935 compliance is essential for manufacturers exporting to the U.S. and EU, while 3-A compliance ensures hygienic design in food and pharmaceutical systems worldwide.

Key Differences Between FDA, EC 1935, and 3-A Sanitary Standards

Key Insight

• FDA focuses on chemical safety and permitted substances
• EU EC 1935/2004 focuses on migration limits and traceability across materials
• 3-A SSI focuses on equipment design, cleanability, and hygienic performance

Together, they define the global compliance landscape for food-contact sealing components.

Steps to Achieve FDA 21 CFR Compliance

FDA compliance for food-contact elastomers and plastics follows a structured process:

1. Verify Approved Materials (Positive List Compliance)

Materials must comply with FDA 21 CFR regulations, especially:

• 21 CFR 177 (polymers used in food-contact applications)
• Only listed additives, stabilisers, and resins may be used
• New substances require a Food Contact Notification (FCN)

2. Extraction & Migration Testing

FDA requires lab testing to measure migration of substances into food simulants. EC 1935/2004 also requires migration testing but uses different simulants and measurement units.

3. Good Manufacturing Practices (GMP)

• Clean, traceable production environments guarantee consistent quality and contamination prevention.
• Essential for manufacturers and reassuring for installers and end-users.

4. Declaration of Compliance (DoC)

• A self-issued document summarising compliance, usually backed by independent lab reports.
• Required for audits, inspections, and export documentation.

Authority cue: A properly prepared DoC demonstrates regulatory compliance to FDA, EC, and 3-A standards, reinforcing credibility with customers and regulators.

Selecting the Right O-Rings, Seals, and Tubing

When specifying components for food-contact applications, consider:

• Regulatory compliance: FDA & EC 1935 for chemical safety; 3-A SSI for hygienic design.
• Material properties: Durometer/hardness, chemical compatibility, temperature resistance.
• Documentation: Lab reports, DoC, audit-ready datasheets.
• Installation suitability: CIP/SIP systems, hygienic operation, maintenance access.

Compliance Comparison at a Glance

• • FDA: Focused on ingredient safety and extractable limits; critical for the U.S. market.
  • EC 1935/2004: Ensures migration limits, traceability, and safe food-contact materials for EU export.
  • 3-A SSI: Ensures hygienic design, cleanability, and bacterial prevention, supporting CIP/SIP systems.
  • Manufacturers exporting to U.S. and EU markets need both FDA and EC 1935 compliance.
  • Proper documentation and independent testing support audits, inspections, and global market access.

Tip: Following these standards ensures high-quality, safe O-rings, gaskets, and tubing for food-contact applications worldwide.

Expert Guidance and Contact

Our team of compliance specialists can help you identify FDA, EC 1935, and 3-A compliant materials, Contact our team of Experts

FFKM (Perfluoroelastomer) O-rings are one of the most reliable sealing solutions available, offering unmatched performance in some of the most demanding environments. Combining extreme temperature tolerance, excellent chemical resistance, and mechanical integrity, FFKM has earned its place in industries ranging from aerospace to chemical processing. 

What is FFKM and Why is It So Effective?

FFKM, or Perfluoroelastomer, is a highly fluorinated version of fluoroelastomer that was first developed in the 1960s. Its unique composition gives it the ability to withstand extreme temperatures ranging from -45°C to +330°C, and makes it resistant to over 1,800 chemicals, including hydrocarbons, oils, fuels, and aggressive solvents. This extraordinary versatility is why FFKM is now used extensively across industries that require the highest standards of sealing performance.

Key Benefits of FFKM O-Rings

1. Exceptional Temperature Resistance FFKM O-rings are designed to perform in both extremely high and low-temperature environments. They can withstand temperatures as low as -45°C (-49°F) and as high as 330°C (635°F). This makes them ideal for industries such as aerospace, automotive, and heavy-duty machinery where temperature extremes are common.
2. Unmatched Chemical Resistance One of the standout features of FFKM is its resistance to a wide range of chemicals. With the ability to resist over 1,800 chemicals, solvents, and plasmas, FFKM O-rings ensure reliable performance even in aggressive environments. This resistance makes FFKM ideal for applications in chemical processing, oil and gas, and semiconductor manufacturing.
3. Superior Permeation Resistance FFKM O-rings are highly resistant to gas and liquid permeation, which can lead to seal degradation and failure. Their ability to prevent permeation helps maintain the integrity of the sealing system, extending the lifespan of the equipment and preventing costly downtime or leaks.
4. Weathering and Ozone Resistance FFKM seals are highly resistant to ozone and weathering, making them perfect for outdoor applications. Whether exposed to fluctuating temperatures, humidity, or UV radiation, FFKM O-rings retain their structural integrity and sealing ability. This resistance is essential in industries like automotive and oil and gas, where outdoor exposure is common.
5. Safety and Non-Flammability FFKM O-rings are typically self-extinguishing and exhibit very low flammability in air due to their fully fluorinated polymer structure. This makes them suitable for applications where fire safety and thermal stability are important considerations.
6. Low Outgassing and Extractables In industries like pharmaceuticals, medical device manufacturing, and semiconductor production, outgassing and particle contamination can cause serious problems. FFKM O-rings feature low outgassing properties, ensuring that they don’t release harmful vapors or particles, which is critical for maintaining cleanliness in high-sterility environments.
7. Outstanding Mechanical Properties FFKM O-rings offer excellent compression set resistance and sealing performance, even under mechanical stress. This makes them ideal for heavy-duty machinery, aerospace, and automotive applications, where maintaining a tight seal under pressure is essential.
8. Suitability for Explosive Decompression FFKM is resistant to explosive decompression, a phenomenon that occurs when a material rapidly decompresses under pressure. This resistance prevents rupture, leaks, and seal failures, making FFKM O-rings highly reliable in high-pressure applications.
9. Customisable Shapes and Sizes FFKM O-rings can be easily customized into a variety of shapes and sizes to meet specific application requirements. Whether you need O-rings, gaskets, or custom seals, FFKM's flexibility ensures a perfect fit for your sealing needs.
10. Ultra-Clean Formulas for High-Sterility Environments For applications requiring the highest levels of cleanliness, such as pharmaceuticals and semiconductor manufacturing, FFKM O-rings are available in ultra-clean formulations. Manufactured in cleanroom environments, these seals are free from contaminants, ensuring the integrity of your processes.
11. We can also supply FFKM with approvals such as:
    • 3-A
    • AED/RGD
    • BfR XXI
    • FDA
    • Low Temperature
    • NORSOK M-710-2
    • NORSOK M-710-3
    • Steam Resistance
    • USP Class VI

Applications of FFKM O-Rings in Different Industries

Given the exceptional benefits of FFKM, it's no surprise that this material is used across a wide range of industries. Here are some of the key applications:

• Chemical Processing: FFKM O-rings are ideal for chemical processing applications, including reaction column seals, chemical fluid handling, and heavy-duty cleaning processes. Their chemical resistance makes them perfect for handling aggressive solvents and chemicals.
• Oil and Gas: In the oil and gas industry, FFKM is commonly used for sealing applications in pump and motor stators, packer elements, and critical sealing parts exposed to hydrocarbons and fuels. Its ability to withstand harsh chemicals and extreme pressure makes it a trusted material for this industry.
• Aerospace: Aerospace applications require materials that can handle extreme temperatures, pressure variations, and environmental stress. FFKM is ideal for use in aircraft engines, seals, and piston rings, where performance reliability is paramount.
• Heavy-Duty Machinery: FFKM O-rings are used in heavy-duty machinery where seals are subject to high mechanical stresses. Industries such as manufacturing, construction, and mining benefit from the durability and performance that FFKM seals provide.
• Automotive: FFKM's resistance to high temperatures, ozone, and a wide range of chemicals makes it a perfect fit for automotive applications. It is widely used in fuel systems, injectors, and high-pressure pumps, ensuring long-lasting, reliable performance in automotive environments.

Why Choose FFKM O-Rings from Polymax?

At Polymax, we specialise in providing top-quality FFKM O-rings and sealing solutions for a wide range of industries. Our FFKM O-rings are manufactured to the highest standards to meet the demanding needs of your applications. Whether you are in aerospace, chemical processing, or automotive, we offer the perfect sealing solution to improve efficiency, reduce downtime, and enhance safety.

We can supply FFKM compounds similar to:

The Polymax team can also work closely with designers and engineers to identify a Polymax compound suited to your specific application. We can support your development process with detailed datasheets, helping you confidently specify the correct material for both current requirements and future designs.

Contact Polymax today to find out how FFKM O-rings can enhance your sealing applications. Let us help you choose the right material and design to meet your specific needs, ensuring performance, reliability, and long-term success. Contact our team on: +44 (0) 1420 474 123 or [email protected] 

Polymax EPDM O-Rings WRAS Certified for Safe Use in Drinking Water Applications

We are pleased to announce that Polymax EPDM O-rings have officially received WRAS (Water Regulations Advisory Scheme) approval, a mark of quality that guarantees compliance with UK water regulations. With Polymax WRAS approved EPDM O-rings, customers can have complete confidence that they are using high-quality, reliable products that meet stringent regulatory standards and perform consistently in every application.  Check out the official Polymax WRAS Listing on the WRAS Website

Our WRAS approved EPDM O-rings offer: Suitability for Drinking Water Systems: The primary benefit is that WRAS approval certifies that a non-metallic product is suitable for contact with drinking water, in compliance with standard BS 6920-1 / 2000. This makes them ideal for use in drinking water applications, such as water supply pipes and plumbing fixtures.

Compliance with UK Regulations: WRAS is the standard used in Great Britain for this purpose. Using WRAS-approved components helps ensure compliance with UK water regulations.

Assured Water Quality: The testing process for WRAS approval ensures that the elastomer materials do not impair the quality of the water they come into contact with. This includes verifying that the material does not: Promote the growth of bacteria Affect the water's colour or appearance Impart any unpleasant taste to the water This milestone reinforces Polymax’s commitment to bringing valuable solutions to the market, in particular where compliance and safety are paramount.

We are often asked questions like: “What’s the difference between a gasket, a seal, and an O-ring?” It’s a great question, and understanding these distinctions will ensure you choose the right sealing solution for your application.

At first glance they may appear to be the same, but when it comes to keeping fluids, gases, or contaminants where they belong, gaskets, seals, and O-rings., each has a unique role in maintaining the integrity of the systems they protect. Choosing the right one is critical for performance, safety, and efficiency.

In this article, we will break down the differences between gaskets, seals, and O-rings, and explain when to use each.

Regardless of the type of seal,  material selection for gaskets, seals, and O-rings is always based on operating criteria such as temperature range, pressure, chemical compatibility, regulatory approval, and mechanical performance.  A common approach that ensures whether your application requires a gasket, seal or O-ring it will deliver reliable sealing in its intended environment.

What is a Gasket?

A gasket is a flat or shaped component that sits between two mating surfaces to primarily prevent leaks, the ingress of any foreign body, and in certain applications reducing noise transfer. Typically compressed between flanges, housings, or covers, gaskets create a tight seal under pressure.

• Materials: Can be manufactured in a wide range of materials including, Rubber (EPDM, Viton®, Nitrile), compressed fibre, graphite, PTFE, metal, or composite laminates.
• Common Uses: Flanged pipe joints, pumps, heat exchangers, automotive applications, HVAC systems, electrical enclosures etc.
• Key Benefits:
  • Excellent for irregular or uneven surfaces
  • Wide choice of materials for chemical, temperature, or fire resistance
  • Can be cut or moulded to suit complex shapes

Short description: Gaskets seal static joints between rigid surfaces.

What is a Seal?

A seal can be used as a generic term to include any component designed to prevent leakage or ingress of fluids, dust, or gases.

However, unlike gaskets, seals are often employed to deal with dynamic applications where there is relative motion at the intersection between moving components, such as rotating shafts or piston rings.

• Types of Seals: Oil seals, mechanical seals, rotary shaft seals, lip seals.
• Materials: Elastomers, PTFE, polyurethane, sometimes bonded to metal for rigidity.
• Common Uses: Pumps, gearboxes, bearings, engines, and hydraulic systems.
• Key Benefits:
  • Withstands movement and pressure
  • Protects against contamination (dust, dirt, water)
  • Extends equipment life

Short description: Seals can cover static applications, but primarily cover dynamic applications, providing a seal between moving parts.

What is an O-Ring?

An O-ring is one of the simplest and most commonly used sealing components. It is a doughnut-shaped ring of elastomer that sits in a groove and compresses between two surfaces.

• Materials: Nitrile (NBR), EPDM, FKM/Viton®, Silicone, PTFE.
• Common Uses: Hydraulic fittings, pneumatic systems, plumbing, automotive, aerospace, food and pharma.
• Key Benefits:
  • Simple, low-cost design
  • Works in static and dynamic environments
  • Standard sizes readily available (BS, AS, ISO ranges)

Short description: O-rings are compact, versatile, and ideal for both static and moving applications.

Gasket vs Seal vs O-Ring — Key Differences

A quick guide to choosing the right option.

• Use a gasket if you are sealing two static, flat surfaces such as flanges.
• Choose a seal if your application involves movement (shafts, rotating parts).
• Select an O-ring when you need a simple, versatile, and low-cost solution for either static or dynamic sealing.

To make sure you make the right choice contact our team