PTFE Envelope Gaskets

Custom Gaskets for Every Application
Stephens Gaskets is Your Reliable Supplier for PTFE Envelope Gaskets
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Bespoke Manufacturing


Instant Quote Service

Worldwide Delivery


Various Gauges/Thicknesses

Bespoke Manufacturing


Instant Quote Service


Instant Quote Service

Worldwide Delivery


Various Gauges/Thicknesses

Global Leaders in Shim Solutions

As a trusted provider of shim solutions, we serve OEMs and businesses globally.

At Stephens Gaskets, we are a proud supplier of PTFE Envelope Gaskets that can be custom made to meet the needs of our customers. Moreover, our experienced team is equipped with the latest technology and machinery to manufacture high-quality PTFE Envelope Gaskets that are built to last.

If you’re seeking high-quality PTFE Envelope Gaskets with a quick turnaround, look no further.

Our reputation as the best in the business is well-deserved. With over 70 years of experience delivering top-notch products that meet both your budget and timeline. Our commitment to quality and efficiency is unwavering.

What are PTFE Envelope Gaskets?

PTFE envelope gaskets are specialised sealing solutions designed for applications that require high chemical resistance and stability under a range of temperatures. These gaskets feature an envelope of PTFE (Polytetrafluoroethylene) material, which encases an inner core typically made from materials like compressed fibre or elastomers. The PTFE layer provides exceptional resistance to corrosive chemicals and solvents, making them ideal for use in industries such as pharmaceuticals, food processing, and petrochemicals.

Key Features and Benefits of PTFE Envelope Gaskets

Chemical Resistance:

PTFE is virtually inert, meaning it can handle exposure to a wide range of aggressive chemicals without degrading.

Temperature Range:

These gaskets can perform under varying temperature conditions, which is crucial for processes that involve heat fluctuations.

Non-Stick Surface:

The natural non-stick properties of PTFE prevent materials from adhering to the surface of the gasket, simplifying cleaning processes.


The robust design and materials used in PTFE envelope gaskets provide long-lasting seals, reducing the need for frequent replacements.


They can be tailored to fit various flange sizes and types, ensuring a perfect fit for specific applications.

These qualities make PTFE envelope gaskets a reliable choice for ensuring tight seals in harsh environments, enhancing the safety and efficiency of your operations.

Benefits of PTFE Envelope Gaskets

These benefits make PTFE envelope gaskets a superior choice for applications requiring reliable sealing performance in challenging conditions. Whether you’re dealing with high temperatures, corrosive materials, or hygiene-critical processes, PTFE envelope gaskets can provide effective and efficient sealing solutions.

Exceptional Chemical Resistance

PTFE, also known as Teflon, is highly resistant to almost all industrial chemicals and solvents. This resistance makes PTFE envelope gaskets particularly useful in chemical processing industries, where seals are frequently exposed to corrosive substances.

Wide Temperature Range

PTFE can withstand temperatures ranging from -200°C to +260°C (-328°F to +500°F), allowing these gaskets to perform effectively in environments with extreme temperature fluctuations without losing integrity.

Non-Stick Surface

The non-stick nature of PTFE prevents substances from adhering to the gasket surface. This feature is especially beneficial in processes where residue build-up could compromise the integrity of the seal or contaminate the product.

Reduced Contamination Risk

Because PTFE does not leach into or react with other materials, it is ideal for use in pharmaceutical and food and beverage industries, where purity and non-contamination are critical.

    Durability and Longevity

    The robustness of PTFE helps prolong the lifespan of these gaskets, reducing the frequency of replacement and maintenance. This durability also contributes to overall cost-effectiveness in the long run.

    Flexibility in Application

    PTFE envelope gaskets are highly adaptable and can be custom-engineered to fit a wide variety of sealing faces, sizes, and shapes, ensuring a perfect seal and compatibility with existing equipment.

    Ease of Installation

    Despite their resilience, PTFE envelope gaskets are relatively easy to install and replace, requiring no special tools or processes, which minimises downtime and labour costs.

    Applications of PTFE Envelope Gaskets

    PTFE envelope gaskets are highly versatile and find applications across a broad spectrum of industries due to their excellent chemical resistance and temperature stability. Here are some of the common applications where these gaskets are particularly useful:

    Chemical Processing

    In industries where strong acids, bases, and solvents are used, these gaskets provide reliable sealing to prevent leaks and contamination.


    The inert and non-toxic nature of PTFE makes these gaskets suitable for processes involving sensitive formulations, ensuring that they remain free from contamination.

    Food and Beverage

    These gaskets are FDA approved for contact with food, making these gaskets a safe choice for food processing applications where preventing contamination is crucial.

    Semiconductor Manufacturing

    The high purity and non-reactive characteristics of these gaskets are essential in semiconductor manufacturing, where even minute contamination can ruin product batches.

    Petrochemical Industries

    The ability of these gaskets to withstand high temperatures and corrosive substances makes them ideal for oil and gas production, refining, and processing.

    Power Generation

    In power plants, these gaskets are used in systems that require stable and durable seals capable of handling both high temperatures and corrosive by-products.

    Pulp and Paper Manufacturing

    Resistance to harsh chemicals and ability to withstand cleaning and bleaching processes make these gaskets useful in the pulp and paper industry.


    Similar to pharmaceutical applications, the biotech industry benefits from the non-toxic and chemically inert properties of PTFE, ensuring that processes remain uncontaminated and safe.

    These applications highlight the adaptability of these gaskets to meet the needs of various high-demand environments, providing effective sealing solutions that enhance safety, efficiency, and operational continuity.

    Looking for a PTFE Envelope Gaskets Supplier?

    Stephens Gaskets is a leading supplier of high-quality PTFE Envelope Gaskets. With over 70 years of experience in the industry, we have a deep understanding of the needs of our customers. We commit ourselves to providing top-notch products and services for companies nation wide.

    Get in touch with us today to learn more about our PTFE Envelope Gaskets and how we can help you with your next project.

    Issues common with PTFE Envelope Gaskets

    While PTFE envelope gaskets offer many benefits, they also come with some challenges or pain points that users may need to consider when selecting them for specific applications. Here are some common issues associated with PTFE envelope gaskets:


    • PTFE is generally more expensive than many other gasket materials. This higher cost can be a significant consideration, especially for large-scale applications where many gaskets are needed.

    Creep and Cold Flow:

    • Under mechanical stress and high temperatures, PTFE can experience creep or cold flow, where the material deforms gradually under constant stress. This can lead to a loss of bolt tension and seal integrity over time, requiring more frequent monitoring and retightening of bolts in critical applications.

    Limited Mechanical Strength:

    • While PTFE is excellent for chemical resistance and temperature tolerance, it does not possess the same level of mechanical strength as some other materials. This can make it unsuitable for applications where high compressive strength is needed.

    Installation Sensitivity:

    • Despite their robustness in harsh environments, these gaskets can be sensitive to over-tightening and improper handling during installation. Over-tightening can compress PTFE excessively, potentially leading to leaks and reduced effectiveness of the seal.


    Thermal Expansion:

    • PTFE has a higher coefficient of thermal expansion compared to many metallic materials used in flanges. This mismatch can sometimes lead to issues with maintaining a seal when there are significant temperature fluctuations.

    Compatibility with Flange Surfaces:

    • To function effectively, these gaskets require well-maintained flange surfaces. Rough, uneven, or damaged flange surfaces can compromise the integrity of the seal.

    Sealing Efficiency:

    • While PTFE is excellent for chemical resistance, its relatively soft surface can sometimes be a disadvantage in applications requiring extremely high sealing efficiency under low bolt loads.

    Understanding these potential drawbacks is crucial for ensuring that these gaskets are used appropriately and effectively. Proper selection, handling, and installation are key to mitigating these issues and maximising the performance and lifespan of these gaskets in various industrial applications.

    Need Guidance on PTFE Envelope Gaskets?

    Stephens Gaskets is a leading supplier of high-quality PTFE Envelope Gaskets. With over 70 years of experience in the industry, we have a deep understanding of the needs of our customers. We commit ourselves to providing top-notch products and services for companies nation wide.

    Get in touch with us today to learn more about our PTFE Envelope Gaskets and how we can help you with your next project.

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