CEN/TC 38/WG 1 - Hazard classes

This Part of EN 335 gives guidance on the application of the hazard class system, as defined in Part 1 of EN 335, to wood-based panels: plywood, particleboards, oriented strand boards, fibreboards, cement-bonded particleboards in relation only to the biological agencies that can attack wood-based panels over a duration sufficient to result in deterioration. This Part is to be used in conjunction with Part 1 of EN 335. Annex A (informative) provides additional guidance on the use and suitability of wood-based panels, preservative treatment and/or finishing within a given hazard class.

This part of EN 335 gives guidance on the application to solid wood of the hazard classes, as defined in part 1 of EN 335, in relation to the biological agents that can attack solid wood. This part shall be used in conjunction with part 1 of EN 335. Annex A gives information and guidance for the user to determine the appropriate hazard class and to select a suitable level of durability (either natural or conferred by preservative treatment).

This part of EN 335 defines five hazard classes which represent the different service situations to which wood and wood-based products can be exposed. This part also indicates the biological agents relevant to each situation. Annex A gives information to these biological agents.