possible in the small space available. Michael Dressler, product coordinator at Jowat, explains: “To maximize the filter surface area in the small space available [...] manufacturers pleat the filter media and stabilize it using a hot melt adhesive.” Adhesives like Jowatherm 262.25 based on ethylene-vinyl acetate (EVA) are optimally [...] the appropriate open time and high green strength. In addition, hot melt adhesives are solid when cold but remain flexible enough to facilitate a safe handling
https://www.jowat.com/pl-PL/szczegoly-newsroomu/adapting-adhesives-for-the-pleating-process/