Static bending strenght of scots pine and beech wood preated with some preservation chemical

This study has designed for determination of static bending strength (SBS) of mainly boron impregrated scots pine and East beech wood. Other chemicals used as control are polyethylene glycole{PEG-400) (P4) and some commercial preservatives such as Vacsol(V), Ammonium sulphate (AS) and di ammonium phospate(DAP), Stiren, Methylemetacrylate and Isocynate type Water-repellents (WR) were used by secondary process on the boron or PEG treated wood by the aim of improving SBS and avoiding the leachability of both chemicals. Results indicated that V and P4 had the advantages of diff usability retention capacities as percentage (Based on oven drywood). SBS of scots pine wood were reduced by acidic solutions of salts. In beech wood SBS were also effected by neutral pH of the solution. WR, surprisingly don't show their aspected protective properties of SBS, in general. This was due to the insufficient polimerization of WR at 70°C drying process prior to SBS determinations. Keywords: Boron, Fire- reterdants, Water- repellents. Wood preservation, Paraffin, Resist of wood, Static bending VII