Process for improving wood and use of the improved wood

A process for improving wood to impart dimensional stability and resonant properties thereto comprising subjecting wood babies to controlled conditions of elevated temperature and pressure in a closed reaction zone, introducing controlled amounts of at least one polymerizable monomer into said reaction zone under conditions whereby said monomer will polymerize and thereby to deposit a thermoset polymer into the capillary walls of the wood without clogging the capillary passages of the wood, said controlled amount being 0.1 to 2.5 weight percent relative to the dry weight of the wood.