Sealing Shielding

Sealing Groove-less Applications with Flat Panel Gaskets

Flat panel gaskets are extruded and spliced seals that have a pressure-sensitive adhesive (PSA) backing. This type of gasket is designed specifically for non-groove applications – applications that are neither designed with a groove nor practical for a machined or cast groove due to their thin covers. An application without a groove typically requires a groove-less sealing solution because the applications cannot be retrofitted to accommodate a groove. And PSA is one of the more popular methods of seal attachment that can provide non-groove sealing.

Common PSA-backed profiles
Common PSA-backed profiles

In order for the PSA backing to be applied, the profile of the gasket must consist of at least one flat surface. Hollow D, solid D, hollow square, solid square, rectangle, U-channel and Omega profiles are a few common standard profiles that can be PSA-backed. Other custom profiles with a flat surface can be applied with PSA as well upon review from application engineers. 

PSA-backed hollow profiles on flat panel
Examples of two PSA-backed hollow profiles on flat panel

PSA-backed gaskets are commonly used as environmental seals in outdoor enclosure applications because these gaskets are capable of passing the wind-driven rain test. Typically, the profiles of flat panel gaskets are hollow. This is because sometimes the thin covers of the enclosures, which usually are made of plastic or composite, require a low closure force in order to avoid deflection and / or breakage of the covers.

The shapes of flat panel gaskets vary depending on the shape of the enclosures. With that being said, a majority of flat panel gaskets resemble four-corner or multi-corner picture frames to form a contour of the enclosure’s shape. 

About pressure sensitive adhesive

The two types of pressure sensitive adhesives offered by Parker’s TechSeal are standard temperature PSA and high temperature PSA.

Standard temperature PSA:

PSA Description: Double-coated acrylic tape       
Release Liner: Blue polypropylene plastic
Service Temp Range: -40° to 150°F [-40° to 66°C]. PSA will function for short periods of time, e.g., 200 hours at 200°F [94°C].  Ultimate high temperature limit 250°F [121°C]
Shelf Life Conditions: One year at 70°F [21°C] / 50% RH
Application Temperature Range:  40° to 150°F [4° to 66°C]

High temperature PSA:

PSA Description: High performance silicone
Release Liner:  84 lb. siliconized polycoated kraft paper
Service Temp Range: -130° to 500°F [-90° to 260°C]
Shelf Life Conditions: One year at 70°F [21°C] / 50% RH
Application Temperature Range:  40° to 150°F [4° to 66°C]

 

Typical Peel Strength Data for Standard Temperature PSA
Typical Peel Strength Data for Standard Temperature PSA

 

Preparing and installing PSA-backed gaskets

It is very imperative that the application’s surface is properly prepared before installing PSA-backed gaskets. The surface must be clean and free of dust or debris to ensure maximum adhesion of the PSA to the application. Failure to comply with the cleaning process could result in poor adhesion and thus inadequate sealing. Detailed instructions on surface preparation for installing PSA-backed gaskets can be found on page 6 of TechSeal’s ParFab Design Guide (TSD 5420).

Once the surface has been prepared, installation is easy: simply remove a portion of the release liner and carefully position the gasket. Then, press firmly against the gasket and continue pressing along the entire length of the gasket. Using thumb pressure or a rubber roller is recommended for ultimate adhesion between the PSA and the substrate’s surface. 

For more information about Parker’s flat panel gaskets, please refer to the product bulletin “Flat Panel Gasket” (TSD 5451), or consult with one of our Application Engineers at the TechSeal Division.

 

Ngoc Nguyen_TechSeal Division_Marketing Communication Analyst

 

 

This article contributed by Ngoc Nguyen, Marketing Communication Analyst, Parker TechSeal Division.

 

 

 

Related content:

Sealing for Harsh Environmental Conditions in Telecommunications Applications

Sealing Fundamentals | Face Seal

 

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Comments

Comments for Sealing Groove-less Applications with Flat Panel Gaskets

Johnson McGee
These gaskets look like they would seal really well. I am replacing the gaskets in my car tomorrow with my friend. They look very similar to these pictured here. I can't wait to learn more about how they work in an engine. Do you think I should take notes tomorrow?

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