The paper presents recent treatment experiences in Europe for the preservation of cultural heritage with the bio-based gel-emulsion solution XILIX® containing SYNERKEM® technology, whose higher diffusion capacity has been proven (up to 8 mm pyrethroid penetration into the wood). This gel-emulsion is already authorized and marketed as preventive and remedial wood preservative in Europe for more than ten years. It is not assumed that due to the low market volume, no products will be going to be authorized for this specific use, and there will be the need for exemptions in Europe. Eight cultural sites located in the following countries: Bulgaria, Czech Republic, France, Hungary, Slovakia and treated up to ten years ago are described including churches, cathedrals, palaces renovated into hotels, castles. Both insect and fungi damages were observed. The matrix “wood” revealed to be well protected.

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