The Importance of Shore A Hardness

Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.  Original content can be found on Parker’s Blog.

Shore A HardnessAn O-ring seal is a circular cross-section ring molded from rubber, used to prevent the loss of a fluid or gas in a gland.  It is the most basic, and at the same time to the most widely used type of seal available since its invention in 1936 by Niels Christensen.

One of the key factors to getting the right O-ring for your application is getting the right hardness.  The hardness of rubber O-rings are measure by the Shore A durometer; the higher the durometer, the harder the compound.  In general, 70-durometer hardness should be used whenever possible, as it offers the best combination of properties for most o-ring applications.

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Spring Energized Seals: Gland Installation

gland1Today we’ll continue our look at spring energized seals by discussing gland designs and installation.

We begin with two-piece glands. Spring energized PTFE seals are rigid when compared to elastomer seals such as O-rings, and can be damaged if stretched or compressed beyond their material limitations.

That’s why we recommend using a two-piece, split gland design whenever possible. This allows easy installation or removal of the spring energized PTFE seal without the need for additional tools, and will greatly reduce the risk of damage to the seal.

Lead-in chamfers that are blended and very smooth are needed to prevent seal damage during installation. You can find full surface finish recommendations by downloading our complete spring-energized seal guide.

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Sealing the Entire Hydroelectric Plant With Garlock Products

Garlock hydroelectricHydroelectric power, generated mainly by hydroelectric dams or run-of-river sites, is a clean, non-emitting, renewable source of energy.  It provides low-cost electricity with virtually zero carbon emissions.

Garlock has more than 100 years of experience in the fluid sealing industry and provides many product lines well-suited for hydroelectric plants.  Couple that with Gallagher Fluid Seals’ vast experience in the hydroelectric industry and you’ll come away with a team that is uniquely qualified to supply all your hydroelectric plant needs.

Read on to learn more from Garlock’s hydroelectric plant product recommendation guide.

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Elastomer or Plastic… Which Should You Choose?

Kalrez KLX-16011Gallagher Fluid Seals is a longtime partner of DuPont®’s, having specified thousands of DuPont perfluoroelastomer parts over the past few decades.

While elastomers were originally created as an alternative to natural rubber, they have expanded to include materials such as high-performance perfluoroelastomers for demanding applications.

These materials can also be used in place of plastics in most, if not all, applications. DuPont is at the forefront of perfluoroelastomer development, creating elastomers with properties that can help meet highly specific application requirements.

Read on to learn more from Dupont about the differences between elastomers and plastics, and how elastomeric seals perform compared to plastic seals.

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Compression Controlled Gaskets for Food and Pharmaceuticals

hygenic2At Gallagher Fluid Seals, we do our absolute best to understand the needs of our customers.  As a Top-25 Parker Distributor, we have a myriad of products at our fingertips to improve your processes.

One relatively new Parker product is their line of hygienic sanitary gaskets, coming out of the company’s integrated sealing systems (ISS) Division in Lynchburg, VA.  These compression controlled gaskets are used widely in the food processing and pharmaceutical industries, being USP Class VI, FDA, and NSF approved.

Here’s what Parker has to say about these products:

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New Video: PTFE Fillers Used During Manufacturing


In our latest video, Gallagher Fluid Seals Engineering Manager Craig Beil discusses the various PTFE fillers used in making seal materials. Fillers include carbon, glass, stainless steel and molybdenum disulfide. Watch the video to learn more about what PTFE fillers can do, and be sure to watch the other videos in our series.

Past videos have explored issues such as radial seal misalignment,  the use of spring energized seals and environmentally-designed static seal gaskets.

We hope you can find something useful in each one.



Garlock THERMa-PUR Style 4122

THERMa-PURTHERMa-PUR™ is a proprietary new gasketing material created by Garlock and designed for use in high temperature sealing applications. It is produced using an environmentally friendly, solvent-free process and combines a unique formulation with a patent-pending fiber core. THERMa-PUR is yet another innovative Garlock Sealing Technologies sealing solution that provides more than just temperature resistance.

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Preliminary Considerations for Spring-Energized Seals

springsealsToday we’ll continue our look at spring-energized seals by exploring some of the preliminary considerations to made when working with these seals.

A spring energized PTFE seal is selected to fit an exact set of service conditions found in your application.

Gallagher Fluid Seals recommends conducting a review of the entire sealing environment. You should use the Engineering Action Request (EAR) form before selecting a seal design.

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New Video: Radial Seal Misalignment Issues


Once again, Gallagher Fluid Seals is pleased to bring its readers another video. This time out, we’re dealing with radial seal misalignment issues.

In this clip, Gallagher Engineering Manager Craig Beil discusses shaft run out and shaft eccentricity, two common radial seal misalignment issues.

Be sure to watch our previous videos on GORE expanded PTFE seals, static seal gaskets and spring energized seals to learn more about our products.

And don’t hesitate to contact Gallagher with any questions, whether they’re about radial seal misalignment or any other product or service. We’ll be happy to help.

Freudenberg Energy Saving Seal

Energy Saving SealThanks to the combination of elastomers capable of withstanding extraordinarily high thermal loads and a friction-optimized sealing lip, the energy-saving seal (ESS) enables the power loss in drive assemblies to be greatly reduced.

The radial shaft seal ESS improves sealing performance by reducing friction between the seal lip and crankshaft through a reduction in radial load of 50% when compared to sprung rubber lip seals and 75% when compared to PTFE lip seals.

Not only does the friction improvement reduce power consumption and improve fuel economy, it also reduces the amount of heat generated at the seal lip and crankshaft interface. The reduction in heat reduces the potential for coked oil build-up and heat aging (hardening) of the rubber. Coked oil build-up, which can reduce the pumping capability and is a typical failure mode of standard PTFE seals, is virtually eliminated.

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