Polypac Step Seal Solutions for Hydraulic & Oil Seal Applications
Polypac Step Seal Solutions
Overview: What is a Step Seal and Why It Matters
Step Seal is a precision-engineered sealing element designed to handle pressure differentials, reciprocating motion, and shaft misalignment in hydraulic systems. Polypac’s Step Seal line combines decades of sealing expertise with modern manufacturing to deliver low-friction, long-life seals that reduce leakage, maintenance downtime and total cost of ownership.
Materials & Technology: Engineered for Performance
Polypac began with filled PTFE (bronze, carbon, graphite, MoS₂, glass) and now offers Step Seal variants in PTFE and elastomers including NBR, FKM, EPDM, silicone and high-performance FFKM. Advanced compounding and precision machining ensure consistent lip geometry and material compatibility for hydraulic fluids, oils and aggressive media — essential for reliable Step Seal performance.
Customization: Tailored Step Seals for Special Conditions
Every application has unique demands. Polypac’s 10,000+ m² facility and industry-leading testing equipment enable bespoke Step Seal designs — from custom cross-sections and compound blends to integrated O-ring energizers and multi-stage sealing solutions. We partner with universities and research institutes to solve complex sealing challenges for extreme temperatures, high speeds, and contaminated environments.
Applications: Where Step Seals Excel
Step Seals are ideal for hydraulic cylinders, piston and rod assemblies, rotary shafts and oil-seal housings. Polypac supplies OEMs and aftermarket channels across agriculture, construction, aerospace, and industrial machinery, providing reliable sealing under high pressure, dynamic motion, and variable lubrication.
Quality Assurance & Support
Founded in 2008, Polypac integrates advanced production and rigorous testing protocols to ensure every Step Seal meets performance targets. Our factory-scale capabilities, traceability systems and technical support deliver rapid prototyping, validation testing and global logistics — making Polypac a trusted Step Seal partner for demanding sealing projects.
Why Choose Polypac
Choose Polypac for proven Step Seal expertise, broad material options, and custom sealing solutions backed by research partnerships and modern manufacturing. Contact Polypac to specify your Step Seal, request samples, or start a custom development program tailored to your equipment’s needs.
Step Seal Display
What is the difference between a static seal and a dynamic seal?
A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.
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.
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.
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.
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