Polypac — Trusted Rod Seal Suppliers for Hydraulic Systems
Polypac — Trusted Rod Seal Suppliers for Hydraulic Systems
Polypac is a scientific and technical hydraulic seal manufacturer and leading rod seal supplier, combining advanced material science with precision production. Founded in 2008, we specialize in filled PTFE rod seals and a wide range of elastomer O-rings, delivering solutions that perform in high pressure, high temperature, and abrasive environments.
Precision Manufacturing & Advanced Materials
Our custom rubber ring and O-ring factory spans over 10,000 square meters with 8,000 square meters of production space and industry-leading equipment. We produce bronze-filled, carbon-filled, graphite, MoS2-filled and glass-filled PTFE rod seals alongside NBR, FKM, silicone, EPDM, and FFKM O-rings. As reliable rod seal suppliers, we ensure material consistency and tight tolerances for long service life.
Custom Solutions for Special Working Conditions
Polypac excels at creating tailored rod seal designs for unique applications. Whether you need seals resistant to aggressive media, extreme temperatures, or severe mechanical wear, our R&D team develops compounds and geometries to match your specifications. We work closely with customers to prototype quickly and scale production to meet demand.
Collaborative R&D and Rigorous Testing
We maintain long-term partnerships with universities and research institutions domestically and internationally to stay at the forefront of seal technology. Every rod seal and O-ring undergoes strict dimensional, hardness, and leakage testing to meet performance targets. Our quality control protocols ensure repeatable results and compliance with industry standards.
Why Choose Polypac as Your Rod Seal Supplier
Polypac combines advanced materials, expansive manufacturing capacity, and responsive customization to be your preferred rod seal supplier. Benefit from proven PTFE expertise, rapid prototyping, competitive lead times, and global logistics. Contact Polypac for consultations, samples, and volume quotations — engineered sealing solutions that protect performance and extend equipment life.
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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.
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.
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.
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.
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