Carbohydrate-based extender for wood-particulate composites

Extenders are commonly added to plywood adhesive mixtures to improve panel properties and reduce cost. This project was performed to determine the effect on nonveneered panel dry mechanical properties of addition to and partial replacement of specific formulations of both urea-formaldehyde (UF) and phenol-formaldehyde (PF) adhesives with a cereal-derived additive (CDA). The addition of CDA did not change bending properties or internal bond strengths for particleboard or flakeboard produced with UF and PF adhesives, respectively. CDA extender replacement of 21 and 17 percent of the UF and PF resin solids, respectively, lowered mechanical properties.

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