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Rubber Tubes for Hydraulic Sealing | Polypac Custom Solutions

Polypac Rubber Tubes — Precision Sealing for Hydraulic Systems

Overview

Polypac specializes in manufacturing high-quality Rubber Tubes and hydraulic sealing components tailored to demanding industrial environments. Founded in 2008, our deep expertise in filled PTFE and elastomeric compounds has evolved into a complete sealing portfolio, including O-rings and custom rubber rings engineered for longevity and leak-free performance.

Product Range

Our Rubber Tubes are available in a wide range of diameters, wall thicknesses and compound formulations to suit dynamic and static sealing applications. From standard NBR tubes for oil resistance to FKM and FFKM for high-temperature and aggressive media, Polypac delivers materials selected for each application to ensure optimal service life and reliability.

Materials and Performance

Polypac combines traditional filled PTFE expertise with modern elastomers—NBR, FKM, EPDM, silicone and FFKM—to create Rubber Tubes that resist abrasion, swelling and chemical attack. Our advanced compounding and testing protocols guarantee consistent hardness, compression set resistance and dimensional stability under pressure and temperature cycles.

Customization and Quality Assurance

With a custom rubber ring and O-ring factory covering over 10,000 square meters and 8,000 square meters of production space, Polypac offers scalable manufacturing and rigorous QC. We provide bespoke Rubber Tubes for special working conditions, rapid prototyping, and close R&D partnerships with universities and research institutions to solve unique sealing challenges.

Applications and Advantages

Polypac Rubber Tubes are engineered for hydraulic cylinders, pneumatic lines, oil and gas equipment, and specialty machinery. Choosing Polypac means selecting a supplier with advanced production equipment, proven material science, and a commitment to on-time delivery and technical support—ensuring reliable sealing performance across industries.

FAQ:

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.

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.

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.

Table of Contents

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Polypac Rubber Tubes — Precision Sealing for Hydraulic Systems
Overview
Product Range
Materials and Performance
Customization and Quality Assurance
Applications and Advantages

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