Properties of laboratory-made plywood with Fipronil? insecticide added in the resin formulation

With the increased use of wood composites in wide-ranging applications, protection against decay fungi and termites will represent one important criterion in material selection. Fipronil?, an insecticide already used to protect agricultural crops and used in the public health sector, was added in the formulation of phenol-formaldehyde resin during the laboratory manufacture of 5-ply plywood. Three-point static bending and shear tests were conducted. The value of modulus of elasticity ranged from 1.1 to 1.2 million psi (7.71 to 8.54 GPa) and the modulus of rupture from 8,000 to 9,099 psi (55.2 to 62.7 MPa). Shear strength and wood failure varied from 198 to 249 psi (1.36 to 1.71 MPa) and 73 to 92 percent, respectively. Analyses of variance showed that the addition of 37.5 to 375 ppm of fipronil did not significantly affect the shear strength or the bending strength at the 5 percent level (p < 0.05). After 24 months of exposure aboveground and in ground contact in Gainesville, Florida, 150 to 250 ppm fipronil loading was sufficient to control the termite activity on plywood samples.

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