Static Seals

Bal Seal® Static Seal

The custom-engineered Bal Seal® static seal sets new standards for performance and reliability in static applications. Precision machined from PTFE and other premium polymers, our seal combines innovative geometries with a wear-reducing energizer to extend the service life of the critical equipment you design.

Static Seal Profiles

Static seal designs can vary greatly in their size, geometry, even orientation. But they all share a common characteristic: they don’t see motion in their service. Here’s a small sampling of the thousands of profiles we’ve engineered for specific static sealing requirements.

Designed for use in applications with internal pressures to 3,000 psi (207bar), this seal features symmetrical lips in an axial orientation.

Bal Seal® Static Seal Axial Profile

This seal, ideal for use in cryogenic applications and pressures to 3,000 psi (207 bar), features an axial orientation and radial-shaped lips for improved sealing effectiveness.

Bal Seal® Static Seal Profile

Ideal for pressures up to 3000 PSI (207 bar), this seal also features a symmetrical lip design in a radial orientation.

Bal Seal® Static Seal Radial Profile

Designs are provided as examples only. By precisely adjusting lip and heel geometries, energizer forces, and material formulations, we’ll create a solution that meets your unique static sealing requirements.

Static Seal Materials

The Bal Seal® spring-energized static seal gives you the ability to closely control frictional forces and optimize sealing effectiveness in a broad range of chemicals, temperatures, and pressures. Base jacket materials consist of polytetrafluoroethylene (PTFE), polyethylene (PE), polyetheretherketone (PEEK), and other specialty polymers. We combine these with advanced filler materials to enhance performance properties. Here’s a small sampling of the materials we’ve formulated for specific static application requirements.

Static Seal Modified PTFE

Excellent wear resistance in various gases, Low abrasion to dynamic surfaces and soft mating materials (aluminum, mild steel, brass, plastics), FDA compliant

Static Seal Graphite-filled PTFE

Light-duty service, Low friction, Very good chemical compatibility, Good wear resistance in liquids, humid conditions

Static Seal Graphite-reinforced PTFE

Severe service conditions, Excellent performance in applications with high pressure, low speed, and high temperature

Static Seal Moly-disulfide PTFE

Severe dry and liquid service, Excellent wear and extrusion resistance in liquids, inert gases, and vacuum

Static Seal Polymer-filled PTFE SP5

Superior heat and wear resistance, Performs well in high or low speed applications when running against soft metals

Static Seal Polymer-filled PTFE SP45

Ideal for contact with housings made from soft metal or plastic, Performs well in high-speed, low pressure applications

Static Seal Polymer-filled PTFE SP191

Light-duty service, Low friction, Excellent chemical compatibility, FDA compliant

Static Seal Polyethylene UPC16

High purity, High wear resistance in water and aqueous solutions, FDA compliant

Static Seal UHMWPE UP30

Suitable for very high pressure, low speed, FDA compatible

Static Seal PEEK P69D

Ideal for bearing seals and backup ring applications, Tolerance for high temperatures and pressures, Excellent chemical compatibility

Static Seal Energizers

At the heart of almost every Bal Seal® static seal is an energizer that’s precision-engineered to promote even wear and longer seal service life. Choosing the right energizer – with the ideal combination of force, fit, and finish – is as critical to the success of your design as the seal material itself.

Bal Spring® canted coil spring energizer (low)
Bal Spring®
Canted Coil Spring Energizer

Friction: Low
Sealing Force: Low

Bal Spring® canted coil spring energizer (medium)
Bal Spring®
Canted Coil Spring Energizer

Friction: Moderate
Sealing Force: Moderate

Bal Spring® canted coil spring energizer (heavy)
Bal Spring®
Canted Coil Spring Energizer

Friction: High
Sealing Force: High

Bal Spring helical spring energizer
Bal Spring®
Helical Spring Energizer

Friction: High
Sealing Force: High

Bal Spring® cantilever spring energizer (heavy)
Bal Spring®
Cantilever Spring Energizer

Friction: High
Sealing Force: High

Elastomeric O-Ring Energizer
Elastomeric O-Ring Energizer

Friction: High
Sealing Force: High

Spring Energizer Force

The Bal Spring® canted coil spring exhibits a unique deflection and force behavior when it’s compressed. Unlike typical spring technologies, our spring exerts a near-constant force across the working deflection range, and its forces remain consistent – even in wide temperature ranges. It resists compression set, and its individual coils compensate for misalignment, tolerance variations, and surface irregularities.

Spring Energizer Force Chart

A variety of spring energizer materials are available to meet chemical, temperature, and galvanic compatibility requirements


Static Seal Sizes

We produce our Bal Seal® spring-energized seals for static applications in sizes ranging from 0.020 in (.508 mm) to 120 in (304.8 cm) inside diameter.

Static Seal Sizes

Static Seal Service Conditions

Temperature, pressure, speed, and media. These are just a few of the major factors you’ll need to consider when choosing a seal for static applications. Our nearly limitless combination of seal materials, energizers, and geometries – coupled with our consultative engineering approach – will help you address all of them, and create a solution that sets your designs apart. Here’s a look at how our Bal Seal® spring-energized seal performs under a variety of conditions.

Pressure Resistance
(thousand pounds per square inch)

Static Seal Pressure Resistance

Vacuum Resistance

Static Seal Vacuum Resistance

Temperature Resistance
(° fahrenheit)

Static Seal Temperature Resistance

Frictional Values
(coefficient of friction)

Static Seal Frictional Coefficient

Seal Media Compatibility

Static Seal Media Compatibility

Locking & Anti-Extrusion Devices

For applications requiring an added level of protection, we can integrate an engineered metal locking ring into the Bal Seal® spring-energized seal design. The locking ring prevents rotation of the seal in the hardware, and it promotes consistent sealing contact under thermal cycling conditions. Backup devices made from PEEK and other materials can be designed to integrate with the seal jacket geometry, or they can be provided as separate parts.

Locking Anti-Extrusion Devices

Static Seal Applications

Technical Resources

Product Catalog

Bal Seal® Reciprocating and Static Seals

Technical Report

Chemical Compatability Guide

Custom components that drive tomorrow’s technologies.®

© 2024 Bal Seal Engineering. All Rights Reserved.

Custom components that drive tomorrow’s technologies.®

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