Many window and door applications call for custom profile designs to achieve the desired performance properties. These profiles can range from dense EPDM glazing seals to dual- and tri-durometer extrusions that combine sponge and dense materials.
Engineers will consider factors such as the required closing force and the direction of the load applied in order to achieve an effective seal.
Designing For Compression
When designing compression fit applications, it is necessary to have a 30–40 percent compression in the channel for sponge sections to hold the seal in place. By the same token, for dense sections, up to 10 percent compression is necessary to hold the seal in the channel.
Another consideration is size of the gap or opening the profile is expected to seal.
This includes both the minimum and maximum gap widths that exist in the application, taking into account tolerances of the enclosure and sealing material.