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Exact Replacement Seal by Polypac

Exact Replacement Seal by Polypac

Polypac offers reliable Exact Replacement Seal solutions designed for direct-fit interchangeability and optimized performance in hydraulic and oil-sealing systems. Founded in 2008, Polypac combines decades of materials expertise and advanced manufacturing to ensure every replacement seal meets or exceeds OEM expectations.

Precision engineered for exact replacement

Our Exact Replacement Seal line is manufactured to tight tolerances to guarantee dimensional interchangeability and consistent performance. Using CNC machining and state-of-the-art molding, each seal replicates original geometry and critical sealing surfaces so retrofit, maintenance, and uptime are simplified.

Advanced materials and proven formulations

We produce filled PTFE variants (bronze, carbon, graphite, MoS2, glass) and a broad range of elastomers including NBR, FKM, silicone, EPDM and FFKM. Material selection is guided by friction, temperature, chemical compatibility and wear resistance to ensure the replacement behaves like — or better than — the original part.

Custom sealing solutions for special conditions

Polypac is not only a seal manufacturer but a partner in problem solving. Our R&D collaboration with universities and research institutes enables customized compounds and profiles for extreme temperatures, aggressive fluids, high speed or abrasive environments where standard parts fail.

Rigorous testing and quality assurance

On a 10,000+ m² campus with advanced production and testing equipment, every Exact Replacement Seal undergoes dimensional inspection, hardness testing, leak and durability trials. Long-term QA protocols ensure batch-to-batch consistency and dependable field performance.

Wide applications and measurable benefits

Ideal for hydraulic cylinders, pumps, motors and oil-sealed rotating equipment, our Exact Replacement Seal reduces downtime, lowers inventory complexity with cross-references, and often improves service intervals thanks to enhanced wear properties and sealing reliability.

Why choose Polypac

Choose Polypac for award-winning expertise, a comprehensive product range and dedicated support for custom retrofits. Contact our engineering team to identify the correct Exact Replacement Seal for your equipment and accelerate your maintenance turnaround.

Exact Replacement Seal Display

FAQ:

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.

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.

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 does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

Table of Contents

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Exact Replacement Seal by Polypac
Precision engineered for exact replacement
Advanced materials and proven formulations
Custom sealing solutions for special conditions
Rigorous testing and quality assurance
Wide applications and measurable benefits
Why choose Polypac
Exact Replacement Seal Display

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