HOW WET MUST WOOD BE FOR BORATE TO DIFFUSE THROUGHOUT THE PIECE?
Wood needs to be at a moisture content of at least 27% for effective diffusion of borate, although this moisture content will only allow a slow migration (it will move at a rate of up to 1mm/week, dependant on temperature). Faster diffusion happens when the moisture content is higher. For example, at moisture contents of 40% or so, the chemical will migrate at a rate of up to 3mm/week, dependant on temperature.
