1 Scope
This Part of EN 20 specifies a method for the determination of the protective effectiveness or the toxic
values of a wood preservative against infestation by Lyctus brunneus (Stephens) in wood which has been treated previously by full impregnation.
This method is applicable to:
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— water-insoluble chemicals which are being studied as active insecticides, or,
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— organic formulations, as supplied or as prepared in the laboratory by dilution of
concentrates.
This method is not applicable to water-based perservatives.
NOTE This method may be used in conjuction with ageing procedures, which do not remove
the added nutrient.