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4 Ways to Improve Polymer Seal Performance

Posted On May 25, 2018

Whether it’s a labyrinth seal used in a compressor or a spring-energized seal used in a cryogenic application, seal performance is critical. Premature failure of seals is simply not acceptable, but there are ways to prevent these problems. In this blog post, we are going to discuss material selection, wear sleeves, lubrication, and optimized seal design as options for improving the performance of your seals.

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Posted in: Polymer Seals

What Engineers Should Know About Polymer Seals and Outgassing

Posted On August 10, 2016

You know that wonderful new car smell? There’s a name for that phenomena: outgassing.

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Posted in: Polymer Seals, PEEK, PTFE

Most Common Causes of Polymer Seal Failure

Posted On July 26, 2016

In this article, we are going to look at five of the most common phenomena involved with polymer seal
failure, and what causes are behind the failure. Let’s start with extrusion.

Extrusion

One of the common causes of seal failure is extrusion. If the extrusion took place on the static side of
the seal, then either the back-up ring is too small or the support surface is somewhat uneven. If it is
extruded on the dynamic side, then there could be one of three causes: extreme pressure, worn
bearings, or too large a gap between the mating surfaces.



Fracturing

Fracturing can take several forms, such as chunks missing or long cracks. If you see entire chunks
missing from the dynamic side, the cause is most likely excessive back pressure. If you see the pressure side of the seal broken and burned, the cause could well be the explosion, at high pressure, or residual air. Long cracks appearing in the V-portion of a seal can result from frequent spikes in pressure or too low a temperature at system start up.

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Posted in: Polymer Seals

Factors Influencing PTFE Seal Behavior: The PV Limit - Part 2 in a 3 Part Series

Posted On June 17, 2016

The performance of a dynamic PTFE seal depends greatly on the pressure and shaft velocity involved. In reality, a seal is in contact with only a small area of rotating shaft, which means that the dynamic forces and energy are going to be concentrated there. Much of the energy that comes from the shaft is going to be dissipated in two forms: wear and frictional heat, both of which can reduce the useful life of a seal. An increase in the force that holds the seal lip against the shaft or an increase in the speed of the shaft makes the effects of wear and heat even worse.

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Posted in: Polymer Seals, PTFE Seals, Spring-Energized Seals, PTFE Spring-Energized Seals

Critical Factors: Reverse Engineering Polymer Seals, Bellows, Diaphragms, & Bearings

Posted On May 20, 2016


What is Reverse Engineering?

Reverse engineering means to recreate a part based on available data about it.  Keep in mind that the goal of reverse engineering is not so much as to create a part that looks and feels identical to the original part (although it can be), but rather provides the same (or better) performance as the original part.  The material might be different.  While it will likely fit in the same space envelope, non-critical geometry might not be the same.  However, the part achieves the same purpose and performs the same function. 

 

Need some more information? Check out these post on the Advanced EMC Technolgies blog:

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Posted in: Polymer Seals, Polymer Bearings, Polymer Bushings, advanced polymers, polymer bellows

3 Reasons You Should Consider PEEK for High Pressure Polymer Seals

Posted On April 15, 2016


Polyetheretherketone PEEK

There are many applications that require high-pressure seals, such as down-hole safety valves, water jet intensifiers, and oil and gas valvesPEEK, short for polyetheretherketone, is a high performance engineering polymer that’s a common choice for high pressure seals.  Let’s see why …

 

 

Want to stay ahead of the curve? Check out additional articles on high performan PEEK seals from the Advanced EMC Technologies blog:

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Posted in: Polyetheretherketone PEEK, Polymer Seals, advanced polymers, PEEK

Cheat Sheet on Surface Finishes and PTFE Spring-Energized Seals

Posted On April 01, 2016


PTFE Spring-Energized Seal Design

When designing a component that includes a spring-energized PTFE seal, it’s not enough just to specify all the seal parameters; another key part of the design is the surface finish of the mating surface.  In this article, we are going to review what surface finish is, discuss the effects of surface finish on seal life, and then go over recommended surface finishes for spring-energized PTFE seals.

 

For more articles on PTFE Spring-Energized Seals from the Advanced EMC Technologies Blog:

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Posted in: Polymer Seals, PTFE Seals, polymer solutions, Spring-Energized Seals, PTFE, PTFE Spring-Energized Seals

Four Most Popular Rotary Shaft Seals Material Options and How They Compare

Posted On March 05, 2016


Evolution of Seal Materials

The evolution of seal materials evolved as seals faced more rugged demands.  Early needs could be met using packed hemp or leather, but as the demands became more and more rigorous new materials were sought.  This led to the introduction of natural rubber seals, which evolved into synthetic elastomers, and finally engineering polymers like PTFE (Polytetrafluoroethylene).

Four of the most common modern material options for rotary shaft seal lips are nitrile rubber, polyacrylate, FKM, and PTFE.  Of these materials, three are elastomers – nitrile rubber, polyacrylate rubber and FKM – and only one is polymer – PTFE.  Let’s see how these materials stack up.

 

Want more about PTFE? Check out these artiicles from the popular Advanced EMC Technologies blog:

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Posted in: Polymer Seals, Sealing Solutions, PTFE Rotary Shaft Seals, PTFE

PTFE Energized Seals with PEEK Back-up Ring: Match Made in Heaven for High Pressure Applications

Posted On February 05, 2016


PEEK Back Up Ring Oil & Gas:

One of the popular choices for seals for the intense, high pressure, corrosive, high temperature environments found in the oil and gas industry is a combination of a PTFE spring-energized seal with a PEEK back-up ring (BUR) installed on the downstream side of the seal gland.  Why?

 

Need more information? Check out these PEEK resources and articles rom the Advanced EMC Technologies:

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Posted in: Polymer Seals, Seals for Oil & Gas, PTFE Seals, advanced polymers, PEEK, Oil & Gas Industry, BUR, back up ring

PTFE Spring-Energized Cryogenic Seals Revisited

Posted On January 29, 2016


Cryogenic Seals

Cryogenic seals must not only handle unbelievable low temperatures, but also perform under high pressure conditions.  If you aren’t familiar with cryogenic seals, a cryogenic seal is a special type polymer seal used with media at temperatures below -238°F and down to -460°F (absolute zero).  Cryogenic seals can be found in a variety of industries, from LNG compressors and loading arms in the petroleum industry to rocket propulsion systems in the aerospace industry.

 

 

Other important articles on Cryogenic Seals from Advanced EMC Technologies:

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Posted in: Dynamic Sealing, Polymer Seals, Cryogenic Seals, PTFE Seals, polymer solutions, mechanical loading arm

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