BS EN 73:2014 pdf free.Wood preservatives – Accelerated ageing of treated wood prior to biological testing一Evaporative ageing procedure.
BS EN 73 This European Standard specifies an evaporative ageing procedure, applicable to test specimens of wood which have been previously treated with a wood preservative, in order to evaluate any loss of effectiveness when these test specimens are subsequently subjected to biological tests.Test specimens are prepared for biological testing of the effectiveness of wood preservatives against either fungi or insects using the appropriate standards methods. Test specimens are exposed, for a specified period,in a dust-free current of air of a defined velocity and temperature.A wind tunnel which is compartmented and fitted with devices for heating and distributing air.The air shall be dust-free and shall not be polluted by chemical products which could have an effect on the test results. The heating and distribution devices shall be such that the temperature and air velocity are maintained constant and uniform in each compartment.
The air leaving the tunnel shall be led away in such a manner that it cannot re-enter the tunnel.The test specimens and their preparation are defined in the standards concerning the biological tests to which they are intended to be subjected.  The evaporative ageing procedure shall be carried out no more than 3 months after the end of the conditioning period that follows the treatment of the test specimens described in the relevant biological test standard. An alternative period can be used if specified by the product supplier. This shall be stated in the test
report.The number of test specimens shall allow the relevant biological tests to be carried out in accordance with the instructions in the appropriate standards, bearing in mind that the evaporative ageing procedure shall be applied equally to treated test specimens that are subjected to biological agents and to control test specimens.Rest the test specimens on one of the small faces parallel to the grain of wood with the faces that are perpendicular to the grain of the wood at least 20 mm away from the corresponding faces of adjacent test pieces. For example, specimens intended for testing in accordance with EN 113 (basidiomycetes).BS EN 73 pdf download.