Long Life Cylinder Seal Solutions by Polypac
Long Life Cylinder Seal Solutions by Polypac
Overview
Polypac specializes in Long Life Cylinder Seal products engineered to extend cylinder uptime and reduce maintenance cycles. Founded in 2008, our scientific and technical approach combines filled PTFE formulations and modern elastomers to provide reliable hydraulic sealing across industrial, mobile, and special-environment applications.
Materials & Technology
We manufacture seals from advanced materials including bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS2-filled PTFE and glass-filled PTFE, plus NBR, FKM, silicone, EPDM and FFKM O-rings. Our 10,000+ m2 campus and 8,000 m2 factory house industry-leading production and testing equipment to guarantee consistent long-life performance and low friction sealing.
Applications & Performance
Long Life Cylinder Seal designs from Polypac are optimized for hydraulic cylinders in construction, mining, agriculture, and industrial automation. They resist extrusion, wear, temperature extremes and chemical attack, delivering extended service life, improved sealing efficiency and reduced downtime for critical equipment.
Customization & R&D
Polypac provides tailored solutions for special working conditions—high speed, high pressure, abrasive media, or extreme temperatures. We maintain long-term partnerships with universities and research institutes to develop bespoke sealing profiles and materials that meet unique customer specifications.
Quality & Manufacturing Advantage
As one of China’s largest dedicated seal manufacturers, Polypac enforces strict quality control from raw material selection to final inspection. Our factories and labs ensure repeatable manufacturing tolerances, rapid prototyping, and scalable production for OEM and aftermarket clients seeking Long Life Cylinder Seal reliability.
Ordering & Technical Support
Polypac supports customers with technical evaluation, sampling, and lifecycle testing to match the optimal Long Life Cylinder Seal to your system. Contact our sales and engineering teams for material recommendations, custom tooling, and global supply solutions backed by experienced application engineering.
Long Life Cylinder Seal Display
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.
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 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.
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