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Bidirectional PTFE Seal — Polypac Two-Way Sealing Solutions

Bidirectional PTFE Seal — High-Performance Two-Way Sealing

Key Features

Polypac's Bidirectional PTFE Seal combines ultra-low friction, excellent wear resistance, and stable dimensional performance to deliver dependable two-way sealing under reciprocating and rotary motion. The Bidirectional PTFE Seal resists extrusion and accommodates pressure from either side, making it ideal for hydraulic cylinders, pumps, and valve stems where reversible pressure differentials occur.

Materials & Fillers

Available in a wide range of filled PTFE compounds, our Bidirectional PTFE Seal options include carbon-filled, bronze-filled, graphite-filled, MoS2-filled, and glass-filled PTFE. Each filler is selected to optimize friction, thermal conductivity, and wear characteristics for specific media and temperatures. Polypac also supplies complementary elastomeric parts—NBR, FKM, EPDM, silicone, and FFKM O-rings—for hybrid sealing assemblies.

Customization & Manufacturing

With an 8,000 m2 production area and advanced machining and testing equipment, Polypac offers tailored Bidirectional PTFE Seal designs to match shaft tolerances, surface finishes, and service conditions. We collaborate with customers and research institutes to develop custom geometries, back-up rings, and bonded configurations, ensuring fast prototyping and scalable manufacturing for OEM and aftermarket needs.

Typical Applications

Bidirectional PTFE Seals from Polypac are engineered for high-demand environments: hydraulic cylinders in mobile equipment, bidirectional pumps, subsea actuators, aerospace controls, and chemical processing valves. Their chemical inertness and broad operating temperature range make them suitable for hydraulic oil, synthetic fluids, aggressive chemicals, and steam applications.

Quality Assurance & Testing

Polypac enforces stringent QA protocols—material traceability, dimensional inspections, friction and wear testing, and pressure-cycle validation—ensuring each Bidirectional PTFE Seal meets performance specifications. Long-term durability tests and real-world simulations confirm reliability under extreme pressure, speed, and temperature cycles.

Why Choose Polypac

As a leading scientific and technical seal manufacturer, Polypac blends decades of PTFE expertise with modern production capabilities to deliver Bidirectional PTFE Seal solutions that reduce maintenance, extend service life, and improve system efficiency. Contact Polypac for consultation, samples, and customized sealing strategies.

Bidirectional PTFE Seal Display

FAQ:

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 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.

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.

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.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

Table of Contents

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Bidirectional PTFE Seal — High-Performance Two-Way Sealing
Key Features
Materials & Fillers
Customization & Manufacturing
Typical Applications
Quality Assurance & Testing
Why Choose Polypac
Bidirectional PTFE Seal Display

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