BS EN 46-2:2016 pdf free.Wood preservatives Determination of the preventive action against recently hatched larvae of Hylotrupes bajulus; (Linnaeus) Ovicidal effect (laboratory method).
BS EN 46-2 If appropriate, use the preservative without further preparation other than any necessary stirring. If it Is a concentrate, dilute the preservative with the diluent specified by the manufacturer to the required working concentration.
A formulation of the preservative to be tested without active ingredients shall also be included in the test.
All treatment solutions shall be freshly prepared.
In the laboratory work area (5.3.3) apply the preservative either by brushing or by pipette to the 50 mm x 25 mm lateral face that would have been furthest from the centre of the tree.
Depending on the type of treatment, the volume (application by pipette) or mass (application by brushing) of the treatment solution shall be determined to obtain the surface application specified by the manufacturer. Place the specimens such that the 50 mm x 25 mm lateral face that Is to be treated is uppermost and apply the appropriate fluid uniformly to that face.
When the preservative is applied by brush, place the test specimens on a balance while being brushed to determine the amount of preservative applied to the nearest 0,01 g.
When the preservative is applied by pipette, move the pipette across the fibre direction and the amount of preservative applied shall be determined to the nearest 0.01 ml.
Several .ipplications can be necessary to apply the required amount. In this case the coats should be applied sufficiently quickly to avoid any solidification of certain substances which can impede the penetration of further coats.
Care shall he taken to avoid fluid running off the lateral face being treated.
When the treatment of specimens is by dipping all faces, except one 25 mm x 50 mm face, shall be sealed (see 8.1.2).
Weigh to the nearest 0.01 g any sealed test specimen, to obtain its Initial mass.
Immerse one test specimen after the other in the treatment solution, moving It during dipping. The dipping time to be used shall be one of the following, agreed beforehand according to the purpose of the test:
— Either one lOs period and/or two periods of lOs at an interval of 24 h.
If the rate of solidification of some constituents of a preservative formulation would have the effect of retarding its penetration during the second dipping. this interval has to be reduced. The interval employed shall be mentioned in the test report.BS EN 46-2 pdf download.