forces or high temperatures. The thermoplastic adhesives facilitate a high bond strength even with a small application surface, long durability and superior [...] compartment also requires superior levels of temperature resistance: the filter bond may be exposed to temperatures from 80 to 130°C. Lamination of activated charcoal [...] Thermoplastic PO and reactive PUR hot melt adhesives facilitate flat surface bonds of activated charcoal media with a high permeability of the filter medium.
https://www.jowat.com/sv-SE/nyhetsrumdetalj/high-performance-adhesives-for-the-manufacture-of-filter-media/