Polypac Excavator Piston Seals — Durable Hydraulic Sealing Solutions

Polypac excavator piston seals provide reliable, leak-free hydraulic performance in harsh conditions. Custom materials, strict testing, and advanced production ensure longer life, less downtime, and easy installation.

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Product Description

Polypac Excavator Piston Seals — Reliable Performance for Heavy Duty Use

Polypac excavator piston seals are designed to deliver dependable, leak-free operation in the most demanding construction and earthmoving environments. Built for durability and ease of installation, these seals protect hydraulic cylinders from contamination, reduce maintenance frequency, and extend component life.

Key Benefits

Long service life: Wear-resistant materials and optimized profiles resist abrasion and extrusion.
Stable sealing: Effective sealing under high pressure keeps hydraulic systems efficient and clean.
Low maintenance: Reliable performance reduces downtime and lowers total cost of ownership.
Easy replacement: Compatible sizes and clear installation guidance speed field service.

Materials & Custom Options

Polypac offers piston seals in a wide range of materials to match working conditions — from filled PTFE variants (bronze, carbon, graphite, MoS₂, glass) to elastomers like NBR, FKM, silicone, EPDM and high-performance FFKM O-rings. We provide tailored compounds and geometries for extreme temperatures, chemical exposure, or abrasive environments.

Quality, Testing & Production Capacity

Founded in 2008, Polypac is a scientific and technical manufacturer focused on seal production and material development. Our custom rubber ring and O-ring factory spans more than 10,000 m² with 8,000 m² of production space. Equipped with advanced production and testing facilities, we maintain rigorous quality control and collaborate with universities and research institutes to stay at the cutting edge of sealing technology.

Why Choose Polypac

Choosing Polypac means getting a partner who values reliability and responsiveness. We deliver customized sealing solutions, fast sample turnaround, and technical support to ensure your excavator hydraulic systems run smoothly. Whether OEM or aftermarket, our seals are engineered to reduce leaks, minimize wear, and keep your equipment working longer.

Contact Polypac for expert advice on selecting or customizing excavator piston seals tailored to your machine and operating conditions.

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Q&A

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.

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

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.

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