Since the last IRG 21 conference in New-Zealand, there one meeting of the plenary committee and several meetings of working groups. The interprative documents prepared by CCE for expliciting the essential requirements of the CCE Directive on the construction products and specially: mechanical resistance and stability / hygiene, health and environment / safety in use are waited to valid the programme of work in the frame of the mandate officially received the 27th of September 1989. What is the advancement of the programme? Definition of biological hazard classes / Natural durability of wood / Treated wood / Performance of preservatives / Test methods

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