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Heavy Duty Step Seal — Robust Sealing Solutions by Polypac

Heavy Duty Step Seal

Product Overview

Polypac's Heavy Duty Step Seal is engineered for demanding hydraulic and rotary systems that require superior wear resistance, extrusion control, and stable sealing under high pressure. Built from advanced filled PTFE variants and High Quality elastomers (NBR, FKM, EPDM, silicone, FFKM), these step seals combine the low friction of PTFE with tailored backup materials to minimize leakage and extend service life.

Key Benefits

Heavy Duty Step Seal offers exceptional benefits for industrial applications: enhanced pressure capacity, improved extrusion resistance, reduced friction torque, and predictable performance across wide temperature ranges. Polypac’s R&D-backed formulations reduce maintenance intervals and increase equipment uptime — critical for heavy machinery, construction equipment, and fluid power systems.

Materials & Customization

Our step seals leverage Polypac’s expertise in filled PTFE (bronze, carbon, graphite, MoS₂, glass) and a broad range of elastomers. Custom sealing profiles, material blends, and dimensional tolerances are available to meet specific working conditions like abrasive media, chemical exposure, or extreme temperatures. Long-term partnerships with universities and research institutes ensure continuous material innovation.

Applications

Designed for harsh environments, the Heavy Duty Step Seal is ideal for high-load hydraulic cylinders, heavy-duty rotary equipment, piston and rod seals, and specialty oil seal applications. It excels where high pressure, frequent cycling, or contamination risk would compromise standard seals.

Why Choose Polypac

Founded in 2008, Polypac combines scientific rigor and advanced manufacturing across a 10,000+ m² facility to deliver reliable sealing solutions. As one of China’s largest seal manufacturers, we provide precise engineering, strict quality control, and scalable production — from prototype to large-volume custom O-rings and rubber components.

Ordering & Support

Polypac offers technical consultation, rapid prototyping, and testing services to ensure the Heavy Duty Step Seal meets your system requirements. Contact our specialists for material selection, performance validation, and custom design options tailored to your operating environment.

Heavy Duty Step 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.

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.

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.

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.

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.

Table of Contents

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Heavy Duty Step Seal
Product Overview
Key Benefits
Materials & Customization
Applications
Why Choose Polypac
Ordering & Support
Heavy Duty Step Seal Display

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