Polypac GST Series Seal — High-Performance Hydraulic Seals

GST Series Seal — High-Performance Hydraulic Sealing Solutions

Overview

The GST Series Seal from Polypac is engineered for demanding hydraulic and oil-sealing applications where reliability, low friction and extended service life are critical. Built on decades of material science and precision manufacturing, GST Series Seal products are ideal for cylinders, valves and rotating shafts operating under high pressure, temperature variation and contaminated environments.

Advanced Materials and Construction

Polypac leverages its heritage in filled PTFE technology and modern elastomers to produce GST Series Seal variants that include bronze-filled PTFE, carbon-filled PTFE, graphite PTFE and MoS2-filled PTFE, plus complementary O-ring options in NBR, FKM, silicone, EPDM and FFKM. This material versatility enables the GST Series Seal to balance wear resistance, chemical compatibility and sealability for specific operating conditions.

Performance Features

GST Series Seal designs focus on minimizing leakage and friction while maximizing durability. Key features include precision-molded profiles, stable dimensions under pressure, excellent extrusion resistance and optimized lip geometry for fast seal-in and reliable dynamic performance. These features reduce downtime and maintenance costs for end users.

Customization for Special Conditions

Polypac's 10,000+ m2 production footprint and advanced testing equipment support tailored GST Series Seal solutions. Working closely with domestic and international research partners, Polypac delivers custom tolerances, compound formulations and integrated sealing systems to meet unique environmental, temperature and media challenges.

Quality Assurance and Testing

Every GST Series Seal undergoes rigorous dimensional inspection, material verification and performance testing to ensure consistent quality. Our supply chain and production processes follow strict controls so that each seal meets customer specifications and industry standards.

Why Choose Polypac GST Series Seal

Choosing the GST Series Seal means partnering with a specialist seal manufacturer with decades of PTFE expertise, broad material capability and scalable production. Polypac combines proven technology with responsive engineering support to deliver sealing solutions that extend equipment life and improve system efficiency.

Contact & Next Steps

For samples, drawings or application evaluation of the GST Series Seal, contact Polypac’s technical team. We provide fast prototyping, material recommendations and full documentation to accelerate your project.

GST Series Seal 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.

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.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

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.

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.

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