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

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Polypac Pressure Seal Solutions — PTFE, O-Rings & Custom Seals

Pressure Seal Solutions from Polypac

High-performance Materials for Pressure Seals

Polypac manufactures Pressure Seal components using industry-leading materials: bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS₂-filled PTFE, glass-filled PTFE and elastomers including NBR, FKM, silicone, EPDM and FFKM. These material options enable seals to resist extrusion, friction and chemical attack under high pressure while maintaining low permeability and long service life.

Precision Manufacturing & Advanced Testing

Our custom rubber ring and O-ring factory spans over 10,000 m² with an 8,000 m² production footprint and top-tier production and testing equipment. Founded in 2008, Polypac combines automated molding, CNC machining and rigorous inspection protocols to ensure each Pressure Seal meets dimensional, hardness and performance standards required for hydraulic and high-pressure systems.

Customized Solutions for Special Working Conditions

Polypac specializes in tailored sealing solutions for extreme temperatures, aggressive fluids and high-pressure cyclic loads. We collaborate long-term with universities and research institutes to develop material formulations and seal geometries that reduce leakage, minimize wear and extend maintenance intervals—delivering reliable Pressure Seal solutions for hydraulic cylinders, pumps, valves and rotating equipment.

Applications & Performance Benefits

Our Pressure Seal portfolio is engineered for hydraulics, oilfield equipment, industrial compressors and process valves. Benefits include superior extrusion resistance, improved frictional stability, chemical compatibility and simplified installation. Polypac seals enhance system reliability, lower downtime and support optimized total cost of ownership.

Why Choose Polypac

As one of China’s largest dedicated seal manufacturers, Polypac combines decades of application knowledge with advanced materials science and custom production capabilities. Whether you need off-the-shelf Pressure Seals or bespoke designs, our team provides rapid prototyping, testing and scale production to meet demanding specifications. Contact Polypac to specify the right material and geometry for your sealing challenge.

Pressure Seal Display

FAQ:

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.

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.

Table of Contents

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Pressure Seal Solutions from Polypac
High-performance Materials for Pressure Seals
Precision Manufacturing & Advanced Testing
Customized Solutions for Special Working Conditions
Applications & Performance Benefits
Why Choose Polypac
Pressure Seal Display

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