BS EN 46-2:2016 pdf download. Wood preservatives — Determination of the preventive action against recently hatched larvae of Hylotrupes bajulus (Linnaeus) Part 2: Ovicidal effect (laboratory method)
7.3 Provision of test specimens 2) Prepare planed strips having a cross-section of (25 ± 0,5) mm × (15 ± 0,5) mm removing a minimum of 2 mm from any surfaces exposed during drying. The longitudinal faces shall be parallel to the direction of the grain. The annual rings shall have a contact angle of 45° ± 15° to the broad faces. Make transverse cuts, neatly to give sharp edges and a fine-sawn finish to the end-grain surfaces, to give test specimens (50 ± 0,5) mm long. The test specimens shall originate from a minimum of three trees or shall be taken at random from a stock originally of more than 500 test specimens. 7.4 Dimensions of test specimens The dimensions of each test specimen after reaching equilibrium in the conditioning chamber (5.3.2) shall be (50 ± 0,5) mm × (25 ± 0,5) mm × (15 ± 0,5) mm. Mark each test specimen so that it can be identified throughout the test. 7.5 Number of test specimens 7.5.1 Test specimens for egg-laying a) Six treated test specimens (no more than two originating from the same tree unless taken at random from a stock of more than 500) for each preservative, each concentration and each duration of treatment; b) three untreated control test specimens (each originating from a different tree unless taken at random from a stock of more than 500) for a complete test of any given preservative; c) three control test specimens treated with the solvent or diluent (5.2.3 or 5.2.4) (each originating from a different tree unless taken at random from a stock of more than 500) if a solvent or diluent (including water) is used. Control test specimens under c) may be omitted if the solvent or diluents is water of drinking quality When dipping is to be used (8.1.3.3) it is advisable to treat more than the specified number of test specimens so that, after weighing, any test specimens with abnormally high or low retentions can be rejected from the batch.BS EN 46-2 pdf download.