Adhesive bonds are the most readily modifiable and, at the same time, give the greatest scope for modification of components of lignocellulosic composites. A study of a manufactured lignocellulosic composite based on a phenol-formaldehyde resin and pine veneer with additives modifying the properties of the resin was made. The multifunctional commercial silicon oxide Protectosil 851 and multi-walled carbon nanotubes were modifiers. Flammability properties of unmodified and modified phenol formaldehyde adhesive were characterized by Heat Release Rate, Total Heat Release, Limited Oxygen Index ) measurements, and shear strength. It was found that a positive effect of the silane additive Protectosil® 851 and carbon nanotubes NC7000™ on the flammability properties of the plywood. It was shown that the adhesive joint enriched with the addition of silane and carbon nanotubes showed a lower Total Heat Release value compared to the control sample. Also, the volume of the Heat Release Rate peak was lowered. Limited Oxygen Index values for plywood with modified resin were increased. What is also important from the utility point of view is that adding mineral fillers to the resin does not decrease the strength properties of joints.

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