Cashew nut shell liquid (CNSL) is a cheap agro-by-product and renewable resource which consists mainly of substituted phenols. A CNSL based resol resin was used in this study as a binder for particleboards. The resin was a copolymer obtained by condensing a mixture of phenol and CNSL with hexamethylenetetramine. Properties of the board viz. water absorption, tensile strength parallel to the surface, tensile strength perpendicular to the surface and compressibility were determined. The effects of the resin content, P:F ratio and CNSL: P ratio of resin binder on the properties of particleboard were also studied. About 10% resin in the moulding formulation was essential to give a board of acceptable quality. The P:F ratio was not very significant in determining the properties. It was possible to include up to 50% CNSL without any deterioration in the properties of the board. This is significant from the conservation viewpoint.
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