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

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Polypac Dual Lip Seal Design

Polypac Dual Lip Seal Design delivers reliable, low-friction hydraulic sealing with a primary sealing lip plus a secondary dust lip. Built from premium materials and advanced production, it offers long life, leakage control, and custom options.

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Product Description

Polypac Dual Lip Seal Design

Polypac Dual Lip Seal Design is a compact, high-performance sealing solution for hydraulic and rotary applications. The dual lip layout combines a primary sealing lip for fluid retention and a secondary lip for contamination protection, giving you reliable operation in tough conditions.

Key Features

Double-lip structure: primary lip for pressure sealing, secondary lip for dust and particle exclusion.
Low friction profile: reduces wear and energy loss for smoother motion and longer life.
Material versatility: available in PTFE-filled compounds, NBR, FKM, EPDM, silicone and FFKM to suit temperature and chemical needs.
Precision molding & testing: manufactured with modern equipment to tight tolerances for consistent performance.

Benefits

Excellent leakage control—ideal for medium to high pressure hydraulic systems.
Improved contamination resistance—secondary lip protects the main seal from dust and debris.
Extended service life—low friction design reduces wear on shaft and seal.
Customizable—size, compound and tolerances tailored to special working conditions.

Applications

Suitable for hydraulic cylinders, rotary shafts, pumps and industrial machinery where reliable sealing and contamination protection are needed. Widely used in construction equipment, agriculture, oil & gas and manufacturing.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer with over a decade of experience. Our facility covers over 10,000 m² and uses industry-leading production and testing equipment. Founded in 2008, we began with PTFE-filled seals and now supply a wide range of O-rings and custom rubber parts. We collaborate with universities and research institutes to deliver durable, optimized seals for special conditions.

Choose Polypac Dual Lip Seals for dependable performance, tailored materials, and expert support. Contact us for samples, drawings review, and custom quoting to meet your exact demands.

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Question you may concern

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 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.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

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.

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

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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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