BS EN 84-2020 pdf free.Durability of wood and wood-based products Accelerated ageing of treated wood prior to biological testing Leaching procedure.
BS EN 84 1 Scope This document specifies a method for leaching, applicable to test specimens of wood or wood-based products which are subsequently subjected to biological tests.
This document is applicable to:
a) the pre-conditioning of test specimens prior to their being subjected to a biological test; or
b) assessment of loss of effectiveness by comparing the performance in a biological test of treated test specimens subjected to this procedure with others that have not undergone any leaching procedure.
NOTE The method can also be used for pre-conditioning of untreated wood, modified wood anti wood-based panel products, whether they received preservative treatment or not.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses
6 Test specimens
6.1 Definition and origin
The test specimens and their preparation are defined in the standards concerning the biological tests to which they are intended to he subjected.
The leaching procedure shall be carried out after the end of the preparation of test specimens for testing described in the relevant biological test standard. This includes any treatment and subsequent conditioning period where relevant.
6.2 Number of test specimens
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 in some tests the leaching procedure shall be applied to control specimens as well as to test specimens.
The control specimens may be of the following kinds where required by the relevant test standard:
— check test specimens that will not he subjected to attack by biological agents after the leaching procedure. These will serve as controls for changes in mass in those tests in which this factor is taken into consideration;
— untreated control or reference species specimens which, after leaching, are subjected to the test by biological agents to check any variation in the behaviour of the reference species.BS EN 84 pdf download.