For frame grooves, the liquid version FERMAPOR K31-A-9808 is used; for filter frames without a groove, the thixotropic sealing foams FERMAPOR K31-A-9025-7-VP (soft version) or FERMAPOR K31-A-5065-1-G-MX (somewhat harder version) are used.

For a comprehensive filter product portfolio, the DM 503 dosing system can alternatively be used, which is designed for three components. This dosing system can produce panel filters with a single seal on a flat surface, as well as panel filters with a groove design and using two different sealing systems.

The applied material foams, expanding to several times its original volume, and forms an elastic soft foam gasket with the desired foam hardness at room temperature. After the dosing cycle, the coupling point of the foam gasket closes seamlessly and is almost invisible. It achieves consistently tight sealing through uniform compression over the entire contour of the panel filter frame.

The decisive factors for the low water absorption of the foam gasket in its installed state are the fine-cell foam structure and the degree of compression.

The fail-safe DM 502 mixing and dosing machine can be operated easily and intuitively without much training. The dosing and process data are recorded, and can thus be tracked and evaluated by the machine operator via the CONTROL 2 operating panel.