dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac Bidirectional PTFE Seal

Polypac Bidirectional PTFE Seal delivers low friction, long life, and reliable performance in demanding hydraulic and rotary applications. Customizable, tested, and backed by advanced R&D and manufacturing.

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Product Description

Polypac Bidirectional PTFE Seal — Reliable, Low-Friction Sealing

Our Bidirectional PTFE Seal is engineered for applications that require smooth motion, tight sealing and long service life. Made from high-quality PTFE compounds, the seal resists wear, chemicals and temperature changes, providing dependable performance in hydraulic cylinders, rotary shafts and other demanding environments.

Key Features

Bidirectional sealing: effective in both directions for greater installation flexibility.
Low friction: minimizes energy loss and reduces heat, improving system efficiency.
High wear resistance: extends maintenance intervals and lowers lifecycle cost.
Chemical and temperature resistant: suitable for a wide range of oils and media.
Available in filled PTFE variants: bronze, carbon, graphite, MoS₂ and glass fills for tailored performance.

Benefits for Your Application

This seal improves equipment uptime and reduces operating costs. Its low friction design helps maintain precise motion control and reduces actuator load. Because Polypac offers multiple PTFE fills, you can choose the balance of stiffness, wear resistance and friction that best fits your working conditions.

Specifications & Customization

Standard sizes cover common shaft and bore dimensions. Polypac also provides custom dimensions, compound selection and tight tolerances to meet special working conditions. Our production uses advanced equipment and strict testing to ensure consistent quality.

Why Choose Polypac

Polypac is a scientific and technical manufacturer specializing in seals and sealing materials. Our custom rubber ring and O‑ring factory spans over 10,000 m² with 8,000 m² of production space. Founded in 2008, we began with filled PTFE seals and now supply a wide range of O‑ring materials (NBR, FKM, silicone, EPDM, FFKM). We collaborate with universities and research institutes to continually improve product performance.

Contact Polypac for a consultation. Tell us your operating conditions and we’ll recommend the optimal Bidirectional PTFE Seal to maximize performance and reduce downtime.

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Q&A

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

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.

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.

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PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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