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Polypac Sealing Gasket Solutions — Precision Hydraulic Seals

Polypac Sealing Gasket Solutions

Overview

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier focused on reliable Sealing Gasket solutions. Founded in 2008, we began with filled PTFE seals and have grown into one of China’s largest seal developers. Our custom rubber ring and O-ring factory covers over 10,000 square meters with 8,000 m² of production space, enabling consistent quality at scale.

Materials and Production Capabilities

We manufacture a broad range of Sealing Gasket and seal materials: bronze-filled, carbon-filled, graphite, MoS₂-filled and glass-filled PTFE, plus O-rings in NBR, FKM, silicone, EPDM and high-performance FFKM. Our production and testing equipment are among the industry’s most advanced, supporting precise tolerances, repeatable molding, and rigorous QA for long service life.

Custom Engineering and Testing

Polypac specializes in bespoke Sealing Gasket designs for special working conditions—high temperature, aggressive media, high pressure, and high-speed rotary applications. We collaborate with universities and research institutes domestically and internationally to optimize compound formulations and sealing geometries. Comprehensive testing (dimensional, material, friction, and endurance) ensures each custom solution meets spec.

Applications and Performance

Our Sealing Gasket products serve hydraulic cylinders, pumps, valves, compressors, and rotary shafts across oil & gas, automotive, chemical processing, and industrial machinery. Engineered for low leakage, wear resistance, and chemical compatibility, Polypac seals reduce maintenance, extend equipment life, and improve system efficiency.

Why Choose Polypac

Choose Polypac for proven materials expertise, rapid prototyping, and scalable production. From PTFE-filled seals to specialty O-rings, our client-focused approach delivers cost-effective, high-performance Sealing Gasket solutions with dependable lead times. Contact us to discuss custom sealing options and samples tailored to your application.

Sealing Gasket Display

FAQ:

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.

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.

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.

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.

Table of Contents

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Polypac Sealing Gasket Solutions
Overview
Materials and Production Capabilities
Custom Engineering and Testing
Applications and Performance
Why Choose Polypac
Sealing Gasket Display

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