PTFE gaskets are made from synthetic fluoropolymer of tetrafluoroethylene and are highly valued for their unique properties. These gaskets are hydrophobic, have an extremely low coefficient of friction, and are resistant to most chemicals, making them suitable for a wide range of applications. PTFE gaskets can be reinforced with fillers like carbon or graphite to enhance their mechanical strength and reduce creep under high pressures and temperatures. They are available in various forms, including virgin, glass or carbon-filled, etched, and expanded PTFE, each tailored to specific sealing needs. Their key features include excellent chemical resistance, high dielectric insulating strength, temperature resistance from -200°C to +260°C, and good moisture resistance. PTFE gaskets are commonly used in pipework, flanges, food, water, and pharmaceutical applications.

PTFE Gasket Product List

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Key Properties of PTFE Gaskets

1. Excellent Corrosion Resistance: PTFE gaskets are highly resistant to a wide range of chemicals and corrosive substances. They can withstand pH values ranging from 0 to 14, with the exception of molten alkali metals and elemental fluorine under high-temperature and high-pressure conditions. This makes PTFE gaskets ideal for applications involving aggressive chemicals, acids, and bases.

2. Outstanding Aging Resistance: PTFE gaskets exhibit excellent resistance to aging. They do not absorb water and are unaffected by oxygen and ultraviolet light exposure. Even after three years of outdoor exposure, the tensile strength of PTFE remains almost unchanged, although the elongation may decrease slightly.

3. Good Mechanical Strength: PTFE gaskets maintain good mechanical strength within the temperature range of -100°C to 100°C. This allows them to be processed into various shapes and sizes, making them suitable for a wide range of applications.

4. Low Electrical Conductivity: PTFE is an excellent insulator, making PTFE gaskets suitable for applications where electrical insulation is required.

5. Non-Stick Surface: The non-adhesive nature of PTFE means that residues do not stick to the gasket, making cleaning quick and easy.

6. Electrical Insulation: PTFE gaskets offer excellent electrical insulation, making them ideal for applications where electrical isolation is critical.

Types of PTFE Gaskets

PTFE (Polytetrafluoroethylene) gaskets are available in various types to cater to different sealing requirements across industries. Here are the main types of PTFE gaskets.

1. Virgin PTFE Gaskets

Virgin PTFE gaskets are made from pure PTFE without any fillers or additives. They exhibit exceptional chemical resistance, low friction, and broad temperature resilience, making them ideal for high-purity applications. These gaskets are non-stick and ensure minimal contamination, making them suitable for critical applications in chemical processing, food and beverage sectors, pharmaceuticals, and high-temperature environments.

2. Expanded PTFE Gaskets

Expanded PTFE gaskets are manufactured from a form of PTFE that has been expanded or stretched. These gaskets offer superior compressibility and conformability, making them ideal for uneven or damaged flange surfaces. They provide excellent chemical resistance and can withstand a wide range of temperatures, ensuring reliable sealing performance in various industrial applications.

3. PTFE Envelope with Compressed Fiber Insert

This type of gasket features a PTFE envelope encapsulating a compressed fiber insert. The combination of PTFE's chemical resistance and the fiber insert's mechanical strength offers enhanced durability and sealing performance. The non-stick surface of PTFE ensures easy maintenance, while the gasket's conformability allows it to adapt to irregular surfaces, making it suitable for demanding applications in petrochemical and chemical processing industries.

4. Glass-filled PTFE Gaskets

Glass-filled PTFE gaskets are composite materials that combine PTFE with glass microspheres or fibers. This combination enhances the gasket's mechanical strength, wear resistance, and dimensional stability. The presence of glass fillers reduces creep relaxation and improves the gasket's ability to conform to irregularities, ensuring a tighter seal. These gaskets are ideal for demanding applications in petrochemical, automotive, aerospace, and high-pressure sealing environments.

Applications of PTFE Gaskets

Due to their unique properties, PTFE gaskets are widely used in the following industries:

Chemical Industry: For sealing corrosive chemicals and acids.

Petroleum Industry: For applications involving oils, fuels, and other petrochemical products.

Pharmaceutical Industry: For ensuring cleanliness and preventing contamination.

Food Industry: For applications where hygiene and non-toxicity are critical.

Aerospace and Automotive Industries: For their durability and resistance to harsh environments.

How to Select the Right PTFE Gasket?

Selecting the right PTFE gasket involves careful consideration of several key factors to ensure compatibility, performance, and reliability in your specific application. Here are the essential factors to consider:

1. Use or Application

Understanding the specific application is crucial in selecting the appropriate PTFE gasket. Different industries and processes have unique requirements, and choosing a gasket that matches these needs ensures optimal performance and longevity. For example, food and beverage processing may require FDA-compliant materials, while chemical processing plants need gaskets with superior chemical resistance.

2. Temperature and Pressure

Evaluating the temperature and pressure conditions is vital to choosing a gasket that can withstand the operational demands. PTFE gaskets are known for their wide temperature range and ability to handle high pressures, but it's important to select a gasket that matches the specific temperature and pressure ranges of your application. This ensures the gasket maintains its integrity and provides a reliable seal under varying conditions.

3. Chemical Compatibility

Assessing the chemical environment ensures the gasket's longevity and reliability. PTFE is highly resistant to a wide range of chemicals, but certain applications may involve specific chemicals that could affect the gasket's performance. Understanding the chemical compatibility helps in selecting a gasket that will not degrade or fail over time.

4. Choosing the Right Material and Type of PTFE Gasket

Considering the application requirements and environmental factors aids in selecting the most suitable PTFE gasket type and material. Different types of PTFE gaskets, such as expanded PTFE, PTFE envelope with compressed fiber insert, virgin PTFE, and glass-filled PTFE, offer varying levels of performance and characteristics. Matching the gasket type and material to your specific needs ensures the best possible sealing solution.

5. Choosing the Right Groove Dimensions

Ensuring proper groove dimensions is essential for optimal sealing performance and preventing gasket failure. The dimensions of the gasket groove must be precisely matched to the gasket's dimensions to ensure a tight and secure fit. Proper alignment and fit prevent leaks and ensure the gasket operates effectively under the intended conditions.

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