Polypac Hydraulic Seals & O-Rings

Polypac offers durable hydraulic seals and O-rings—PTFE, NBR, FKM, silicone and more—manufactured with advanced equipment and strict testing. Custom sizes and materials for demanding conditions with fast support and reliable quality.

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Product Description

Polypac Hydraulic Seals — Reliable Performance for Demanding Systems

Polypac designs and manufactures hydraulic seals and O-rings that deliver long life, low friction, and dependable sealing in tough working conditions. Founded in 2008, Polypac combines advanced production and testing equipment with over a decade of sealing expertise to meet the needs of hydraulic systems across industries.

Why choose Polypac hydraulic seals?

Our seals are made to protect your equipment, reduce downtime, and lower maintenance costs. We focus on practical benefits you can see: improved durability, consistent sealing under pressure, and compatibility with hydraulic oils and additives. As one of China’s largest dedicated seal manufacturers, we ensure stable supply and fast turnaround.

Materials and product range

Starting from filled PTFE products—bronze, carbon, graphite, MoS₂, and glass-filled PTFE—Polypac now offers a wide selection of materials to match different environments, including:

NBR (nitrile) for oil resistance and general hydraulic use
FKM (Viton) for high-temperature and chemical resistance
Silicone for wide temperature ranges and flexibility
EPDM for water and steam systems
FFKM for extreme chemical resistance

Custom solutions and quality assurance

Our custom rubber ring and O-ring factory covers more than 10,000 m² with 8,000 m² of factory space, equipped for precision molding and rigorous testing. We partner with universities and research institutes to develop sealing materials and tailor solutions for special working conditions. Every batch undergoes inspection to meet performance and dimensional standards.

Fast support and partnership

Polypac values clear communication and reliable service. Whether you need standard hydraulic seals or a custom compound and profile, our team provides application guidance, rapid prototyping, and production scale-up. Contact us for a quote, material recommendation, or samples—our goal is to protect your equipment and help your application run smoother.

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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.

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 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.

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