Development of Bio-Resin from Sengon Bark Extracts for Sustainable Wood Adhesives

This study aims to develop a formulation for bio-resins derived from Sengon bark for application in plywood products. The research results demonstrated that bio-resin formulas for plywood applications include Bark Extract (E): Tapioca (T): Resorcinol (R): Formaldehyde (F) = (1.00 : 0.025 : 0.50 : 0.1) % and E : T : R : F : Resin (PF) = (1.00 : 0.025 : 0.025 : 0.1 : 0.025) %. Laboratory trials show that both adhesive formulations technically have potential for plywood production applications. Bio-resin adhesives exhibit high moisture resistance. Sengon bark extract, tapioca starch, resorcinol, and formaldehyde can be formulated into bio-resins with alkaline catalysts or PF fortifiers, maintaining a final pH of 10–11. The resulting adhesives show potential for plywood production, exhibiting high moisture resistance.