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Notwithstanding the enormous benefits of medium density fiberboard, free formaldehyde emission and low water resistance are the significant disadvantages to reducing their application. In this research, phenolic compounds such as phenol, 1,2,4-trihydroxy benzene (hydroxyquinol), and 4-tert-butyl catechol in various amounts were added to an industrial-grade liquid urea-formaldehyde polymer in an attempt to alleviate these defects. Medium density fiberboard panels were manufactured from the modified urea-formaldehyde resins. The panels' physical and mechanical properties, such as thickness swelling, water absorption, formaldehyde emission, modulus of rupture, modulus of elasticity, and internal bond strength were then investigated. The results showed that the free formaldehyde emission contents for the modified composite panels ranged from 25.4% to 50.1% lower than for the unmodified panel. Also …