POB-Filled PTFE Gasket

The polyphenyl ester filled PTFE gasket is produced with PTFE as the matrix, blended with polyphenyl ester filler and functional additives via high-speed mixing and compression molding.

With polyphenyl ester incorporated, the material features excellent creep resistance, wear resistance and self-lubricity. Its short-term peak temperature resistance reaches 300–315℃, with a continuous service temperature range of -180 ~ +260℃.

Why Choose a POB-Filled PTFE Gasket?

What Is Polyphenyl Ester (POB)?

Polyphenyl Ester (POB) is a high-performance heat-resistant aromatic polyester engineering plastic with outstanding thermal and tribological properties.

Key Performance Parameters:

POB features outstanding thermal stability with a decomposition temperature of 530°C. Its continuous service temperature reaches up to 260°C, while short-term peak temperature can hit 300–315°C. It delivers superior comprehensive performance in thermal stability, self-lubricity, hardness, electrical insulation and wear resistance among high-performance polymers.

Combination of POB and PTFE: The POB-filled PTFE composite retains PTFE’s full chemical resistance and low friction coefficient, while greatly improving PTFE’s inherent weakness of poor wear resistance and cold flow, delivering complementary performance advantages.

Product Form

Typical Color: Dark Brown, Black, Gray

POB Filled PTFE vs. Conventional PTFE Gasket

Core Advantages

1. High-Temperature Resistance

Product Features: Thermal decomposition temperature reaches 530°C; continuous operating temperature up to 260°C, short‑term peak temperature up to 315°C; suitable for high‑temperature sealing environments.

Customer Value: Ideal for sealing applications in equipment such as high‑temperature valves, compressors, and heat exchangers; minimizes the risk of material failure caused by high temperatures.

2. Creep Resistance

Product Features: Creep resistance is up to four times higher than that of virgin PTFE; offers superior dimensional and sealing stability under sustained pressure.

Customer Value: Helps maintain stable bolt preload and torque; reduces the need for re‑tightening and lowers maintenance frequency.

3. Wear Resistance

Product Features: Wear resistance is up to 1,000 times higher than that of virgin PTFE; exhibits excellent mating surface compatibility, minimizing damage to counter‑surfaces.

Customer Value: Ensures a long service life under conditions of continuous friction and oil‑free lubrication; reduces the need for component replacement and equipment downtime.

4. Self-Lubrication

Product Features: Dynamic friction coefficient ranges from approximately 0.16 to 0.32; offers excellent self‑lubricating properties without relying on external lubricants.

Customer Value: Enables stable, long‑term operation under oil‑free conditions; reduces costs associated with lubricants and routine maintenance.

5. Chemical Resistance

Product Features: Resistant to chemicals across the full pH range (0–14); withstands strong acids, strong alkalis, and various organic solvents.

Customer Value: Compatible with almost all common corrosive media; meets sealing requirements for demanding environments in the chemical, pharmaceutical, and other industries.

6. Thermal Conductivity

Product Features: Thermal conductivity is approximately 3–5 times higher than that of standard plastics; efficiently conducts and dissipates heat generated during friction.

Customer Value: Helps minimize frictional heat buildup and enhances continuous operational stability; suitable for high-speed motion and high-frequency operating conditions.

Technical Specifications

NOT Suitable For: Molten alkali metals and fluorine gas (PTFE is inherently incompatible)

Product Applications

FAQ

Q: What is the difference between POB-filled PTFE gaskets and conventional PTFE gaskets?

Q: What is the difference between POB-filled PTFE gaskets and conventional PTFE gaskets?

A: POB-filled PTFE gaskets contain POB filler, continuous temperature up to 260°C, short-term peak temperature up to 315°C (virgin PTFE only 260°C), up to 4x better creep resistance, up to 1000x better wear resistance, dynamic COF 0.16-0.32. Virgin PTFE softens and creeps above 260°C.

Choose POB filled for: Short-term peak service above 260°C, oil-free lubrication, long-service-life applications.

Choose virgin PTFE for: General chemical sealing, temperatures below 260°C, non-critical applications. POB-filled PTFE offers 1-2x better comprehensive performance than virgin PTFE.

Q: What are the temperature and pressure limits for POB-filled PTFE gaskets?

A: Temperature: Continuous -180°C to +260°C (short-term peak up to 315°C).

Decomposition temperature: 530°C, excellent high-temperature stability.

Pressure: Depends on gasket design and flange conditions, POB-filled PTFE offers up to 4x better creep resistance than virgin PTFE.

Chemical: pH 0-14, excellent resistance to almost all organic solvents and oils.

For application-specific data, please provide your media, temperature, and pressure.

Q: What is the optimal POB content for POB-filled PTFE gaskets?

A: According to research data, 20% (by weight) POB content provides optimal performance.

At this filler level, the composite achieves an optimal friction coefficient and wear scar width while maintaining good mechanical properties.

As POB content increases, friction coefficient and wear scar width decrease, but when content exceeds 30%, tensile strength decline slows and hardness increases.