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GST Series Seal — Polypac High-Performance Hydraulic Seals

Polypac GST Series Seals deliver low friction, excellent wear and chemical resistance for hydraulic and industrial use. Available in filled PTFE and elastomer options, fully customizable and produced with advanced testing for reliable performance in harsh conditions.

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Product Details

GST Series Seal — Reliable sealing for demanding applications

The Polypac GST Series Seal is a family of high-performance hydraulic seals engineered for long life and low friction. Combining our expertise in filled PTFE materials and high-quality elastomers, GST seals provide excellent wear resistance, wide temperature tolerance, and strong chemical compatibility. They are ideal for mobile hydraulics, industrial cylinders, pumps, and custom equipment that require dependable sealing under tough conditions.

Key Features & Benefits

Low friction design — reduces energy loss and heat build-up for smoother operation.
Superior wear resistance — filled PTFE options (bronze, carbon, graphite, MoS₂, glass) extend service life.
Wide material choice — PTFE variants and elastomers (NBR, FKM, EPDM, silicone, FFKM) for tailored compatibility.
Strong chemical and temperature performance — suitable for aggressive fluids and broad temperature ranges.
Custom sizes and profiles — manufactured to customer drawings or samples for special working conditions.
Precision quality — produced in a modern 10,000+ m² facility with advanced production and testing equipment.

Technical Highlights

GST seals use Polypac’s proven filled PTFE compounds for low wear and excellent sliding properties, paired with optimized elastomeric elements when needed for sealing flexibility. Tolerances are tightly controlled, and material selection is guided by application pressure, speed, fluid type, and temperature.

Typical Applications

Hydraulic cylinders, piston and rod seals, rotary shafts, pumps, valves, heavy machinery and any custom equipment exposed to high pressures, abrasive media, or extreme temperatures.

Why Choose Polypac

Founded in 2008, Polypac combines decades of sealing expertise with extensive R&D partnerships. Our large factory and advanced testing capabilities ensure consistent quality. We offer fast prototyping, flexible production runs, and tailored sealing solutions backed by technical support—so you get the right GST seal for your toughest challenges.

Contact Polypac to specify GST Series Seals for improved durability, reduced maintenance, and reliable performance in the field.

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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.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

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.

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.

Get in Touch

PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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GST-PHE01 Guiding Elements | Specialized Bidirectional Seal for Hydraulic Equipment