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Polypac Excavator Piston Seals — Durable Hydraulic Solutions

Polypac Excavator Piston Seals — Precision Sealing for Heavy Equipment

Overview

Polypac specializes in manufacturing high-reliability excavator piston seals designed for the most demanding hydraulic systems. Our seals are engineered to provide exceptional sealing performance in high-pressure, high-speed and contaminated environments common to construction equipment. Whether for new builds or retrofit projects, Polypac's excavator piston seals ensure leak-free operation and longer maintenance intervals.

Materials & Performance

We offer a broad range of materials including bronze-, carbon-, graphite-, MoS₂- and glass-filled PTFE for low friction and high wear resistance, alongside elastomers such as NBR, FKM, silicone, EPDM and FFKM for optimal compatibility with oils and extreme temperatures. Each compound is selected to balance friction, extrusion resistance and chemical compatibility so your excavator piston seals perform reliably under shock loads, abrasive particles and thermal cycling.

Manufacturing & Quality

Polypac's custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space and industry-leading manufacturing and testing equipment. Founded in 2008, we combine decades of material expertise with strict QA processes and collaborative R&D with top universities and research institutes to validate seal life, hardness, and dimensional precision for excavator piston seals.

Customization & Application

Every fleet and hydraulic circuit is different. Polypac provides bespoke sealing solutions — from profile redesigns to compound tuning — to meet unique working conditions like high contamination, deep mud, saltwater exposure, or extreme heat. Our custom O-rings and rubber rings complement excavator piston seals to create complete, reliable sealing systems tailored to your equipment.

Why Choose Polypac

As one of China’s largest dedicated seal manufacturers, Polypac combines material science, precision manufacturing and field-proven designs to lower downtime and total cost of ownership. Contact us for sample kits, material data sheets and application-specific recommendations — and experience excavator piston seals engineered to keep your hydraulics running stronger, longer.

excavator piston seals Display

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.

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 does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

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.

Table of Contents

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Polypac Excavator Piston Seals — Precision Sealing for Heavy Equipment
Overview
Materials & Performance
Manufacturing & Quality
Customization & Application
Why Choose Polypac
excavator piston seals Display

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