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Polypac Viton (FKM) Piston Rod Seal

Polypac Viton (FKM) piston rod seals offer reliable high-temperature, chemical and oil resistance for hydraulic cylinders. Precision-made in our advanced facility, they deliver long life, low friction and customizable options for demanding environments.

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Product Details

Polypac Viton (FKM) Piston Rod Seal — Reliable Hydraulic Rod Sealing

Polypac Viton (FKM) piston rod seals are engineered for hydraulic and pneumatic cylinders that demand exceptional resistance to heat, oils and aggressive chemicals. Made from high-quality FKM (Viton) compound, these rod seals provide durable, low-friction protection to extend cylinder life and reduce maintenance.

Key Features

High temperature resistance — stable up to 200°C (392°F) for demanding thermal conditions.
Chemical and oil resistance — excellent performance with hydraulic fluids, fuels and many solvents.
Low friction and wear — smooth rod operation reduces energy loss and component wear.
Precision manufacturing — made in Polypac’s advanced facility with strict quality control and testing.
Custom sizes available — tailored seals for special working conditions and non-standard rods.

Applications

These FKM piston rod seals are ideal for heavy machinery, construction and mining equipment, high-temperature hydraulic presses, marine hydraulics and any application where oil and chemical resistance are critical. Whether replacing worn seals or designing a new system, Polypac rod seals keep cylinders running smoothly.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with over a decade of experience. Our 10,000+ m² custom rubber and O-ring factory, advanced production and testing equipment, and long-term research partnerships ensure you get reliable, consistent seals. We began with filled PTFE seals in 2008 and now offer a wide range of materials including NBR, FKM, silicone, EPDM and FFKM.

Customer Value

We prioritize product quality and customer support. Every Viton (FKM) piston rod seal is precision-tested for fit and function. Polypac offers fast quotes, flexible quantities, and technical guidance to help you choose the right hydraulic rod seal for your needs — ensuring reduced downtime and better long-term performance.

Contact Polypac for specification sheets, material certificates, or custom sealing solutions designed for extreme environments.

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Q&A

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 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 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.

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.

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