This Part of EN 599 specifies for each of the five hazard classes defined in EN 335-1, requirements for classifying and marking wood preservative products according to their performance and suitability for use. This Part of EN 599 is applicable to all wood preservative products supplied for application in liquid form for the preventive treatment of timbers (structural and non-structural) against wood-attacking fungi, wood-attacking insects and marine organisms as described in HD 1001 and EN 335-1.