Gaseous or vapor phase treatment of wood with boron preservatives

摘要

The invention comprises a process for the preservation of timber with a boron based compound, such as trimethyl borate. The timber is dried to a low moisture content, is then subjected to a vapour of the boron compound in a suitable treatment vessel, and after vapour treatment is steam conditioned to return the moisture content of the timber to a normal working level. The vapour treatment is preferably carried out under heat and reduced pressure.