Under practical conditions a minimum moisture content of 80% demande by the German quality standard RAL-RG 411 can not be guaranteed throughout the year. Storage of logs with bark prolonges the drying process; a storage without bark must be avoided. A sufficient penetration according the standard can be achieved at least with a moisture content of 60%, optimal conditions may prevail between 100% and 120% mc. Above 125% the treatability of the logs declines considerably. Logs with broader annual rings evealed a deeper penetration than those with small rings. Machine barked logs showed a deeper penetration than handbarked ones.

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