ČSN EN 20-1 (490688)

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Wood-protecting chemicals

Die Annotation des Normtextes ČSN EN 20-1 (490688):

This part of the EN 20 series specifies a method for the determination of the protective effectiveness or the toxic values of a wood preservative against infection by Lyctus brunneus (Stephens) when the product is applied as a surface treatment to wood.

This method is applicable to:

• - water-insoluble chemicals which are being studied as active insecticides; or
• - organic formulsation, as supplied or as prepared in the laboratory by dilution of concentrates; or
• - organic water-dispersible formulations as supplied or as prepared in the laboratory by dilution of concentrates; or
• - water-based preservatives, for example salts.

NOTE - This method can be used in conjuction with ageing procedures, which do not remove the added nutrient