The research focused on exploring the potential use of tannin (T) and furfuryl alcohol (FA)-based adhesives as a sustainable alternative to synthetic adhesives containing substances harmful to the environment and human health. The main objective was to determine the influence of adhesive mixture composition and pressing parameters (temperature, time) on the shear strength of bonds. In-depth analysis was carried out on three mixtures: T10–FA20, T10–FA20–H1, and T10–FA20–H1.5, with hexamethylenetetramine (H) added as a crosslinker. For a rapid assessment of strength and curing dynamics, the ABES (Automated Bonding Evaluation System) method was applied. A shear test according to the standards SIST EN 205:2016 and SIST EN 12765:2016 was also planned for the most promising mixture, however, it was ultimately carried out with the additional adhesive mixture T10–FA30. ABES results showed a significant increase in shear strength with higher temperature and longer pressing time. The highest average shear strength values were achieved with T10–FA20–H1.5, at 150 °C after 600 s, for which the strength exceeded 8 N/mm². The standard test confirmed that the T10–FA30 adhesive can be classified into the C1 non-structural thermosetting adhesive class, and even into class C2, as the average shear strength of the bonds was 10.54 N/mm² (batch 1) and 10.20 N/mm² (batch 2). The conclusion of the research is that tannin and furfuryl alcohol-based adhesives, with appropriate selection of composition and pressing conditions, are competitive with some existing synthetic adhesives and represent a sustainable alternative with satisfactory mechanical strength and the potential for improved water resistance.
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