Besides the performance of tannin extract as a formaldehyde scavenger, its effect on mechanical properties was also determined in this study. The modulus of rupture and internal bond strength values of MDF panels are presented in Fig. 2 and Fig. 3, respectively. The change in modulus of elasticity values of these MDF panels produced with UF resin containing tannin solution in different concentrations is submitted in Fig. 4.
In this work, the necessary quality procedures specified in the EN 622 standard method were carried out [12]. The value of MOR is >25 N/mm2, IB is >0.65 N/mm2, and the value of TS (24 h) is