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Polypac Bidirectional Sealing — Reliable Reversible Seal Solutions

Polypac Bidirectional Sealing offers durable, leak-proof solutions for hydraulic and oil systems. Custom materials, advanced production, and tested designs protect equipment under forward and reverse pressure.

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Product Details

Polypac Bidirectional Sealing — Reliable, Reversible Seal Solutions

Polypac Bidirectional Sealing is designed to prevent leakage and extend service life in systems that experience pressure from both directions. Simple to install and robust in operation, these seals are ideal for hydraulic cylinders, valves, pumps and rotating shafts where reverse-pressure and variable loads exist.

Key Features

Bidirectional sealing capability — effective under forward and reverse pressure.
Wide material range — PTFE (including bronze, carbon, graphite, MoS₂, glass filled), NBR, FKM, silicone, EPDM, FFKM.
Custom sizes and profiles — tailored to special working conditions and tight tolerances.
High wear and extrusion resistance — designed for long life and low maintenance.
Strict quality control — advanced production and testing equipment ensure consistent performance.

Why Choose Polypac

Founded in 2008, Polypac combines deep sealing expertise with modern manufacturing. Our custom rubber ring and O-ring factory spans over 10,000 m², with 8,000 m² of production space and industry-leading equipment. We began with filled PTFE seals and have expanded to offer a broad range of elastomers and high-performance materials. Long-term partnerships with universities and research institutes help us develop reliable, application-focused solutions.

Practical Benefits

Polypac Bidirectional Sealing reduces downtime and maintenance costs by providing stable sealing under changing pressure directions. Its compact design fits existing housings, and material options let you choose the best balance of friction, chemical resistance, and temperature tolerance. For demanding environments, we offer customized designs to handle aggressive media, high temperatures, or heavy contamination.

Applications

Common uses include hydraulic cylinders, directional control valves, piston and rod seals, rotary unions, and oil-retaining features in pumps and gearboxes. Engineers and maintenance teams value these seals for predictable performance and longer service intervals.

Contact Polypac for tailored bidirectional sealing solutions—engineered for reliability, tested for real conditions, and backed by professional support.

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Q&A

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.

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 can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

If you have any other questions, please write email to us or call us , we will reply you ASAP.

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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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