CIvit ( Swlntonia florlbunda ) veneer, dry (10—20 percent moisture content) boric acid and 1.9 percent for 10, 25 and 40 minutes, three-ply plywood. 1.5 mm thick, both green and were soaked in 1 25 percent borax solutions separately at 90° —100°C These were conditioned and glued into with a ureaformaldehyde adhesive fortified with melamine, for producing boil-resistant glue-bond. Plywood shear test samples were prepared and tested in both dry and wet (boiled in water for six hoyrs and tested while wet) states.

Dry shear tests show that green veneers treated with both boric acid and borax, and dry veneers treated with borax had the higher bond strength, while the longest treating time (40 minutes) had the lowest bond strength, all the differences being significant at the 5% level. The wet test shows significant differences at the 5% level between the preservatives, borax treatment producing better bond strength However, all the treatment combinations resulted in adequate bond strength for the type of plywood produced.

For manufacturing highly water resistant Civit plywood which will also resist fungal lyctus and drywood termite attack, the veneers can be treated with borax or boric acid solutions without adversely affecting subsequent gluing.