WOOD PRESERVATIVE

Wood treated with C12-16-ADBAC-containing biocidal product is not intended for and contains label restrictions against use in areas where food for human consumption is prepared, consumed or stored, or where the feedingstuff for livestock is prepared, consumed or stored. Therefore, no analytical method for the determination of residues in food/feed of plant/animal origin is required, either.

The active substance Alkyl (C12-16) dimethylbenzyl ammonium chloride (C12-16-ADBAC) in Type 8 products acts as a fungistatic and an insecticide. It is used for preventive protection of wood and constructional timbers in Hazard Classes 1 to 4A according to ISO draft standard.

Effectiveness C12-16-ADBAC is a cationic surfactant type active substance. Since it is surface active, it has fair wetting properties and reacts strongly with cell walls of micro-organisms. Its mode of action, therefore, is to destroy the cell walls by sticking on the exterior structures and by entering and disintegrating the inner phospholipid-bilayer-based membrane structures. Due to its interaction with phospholipid-bilayer-based structures, it severely alters the cell wall permeability, disturbs membrane-bound ion-translocation mechanisms and may facilitate the uptake of other biocides.

The field of application of Alkyldimethylbenzylammonium Chloride includes wood preservatives for the preventive treatment against wood destroying organisms and against wood discolouring moulds and fungi. The use concentration depends on the type of application technique, use class required, and on additional formulation components.

Quaternary amine (quat) biocides in the wood preservation market are always used in formulations in combination with other active substances. Efficacy studies with quats alone require considerably higher concentrations than those actually used in these formulations. Therefore, the use of “quat only” efficacy data for risk assessment may provide an exaggerated environmental exposure level.

Against fungi, a selective activity spectrum exists.

The biocidal product (BQ-25) contains 25% Quaternary ammonium compounds, benzyl-C12- 16-alkyldimethyl, chlorides in water.It is used in drenching/dipping and vacuum pressure process applications. In practice it is always used in formulations in combination with other active substances.

The biocidal product concentrate is diluted to a suitable working strength with water. The degree of dilution will vary depending on the wood species, type of wood product and anticipated use. The requirements for the final concentration of C12-16-ADBAC vary between 0.4% and 2.0%. The application rate of C12-16-ADBAC in wood is 2.0 kg/m3 . Number and timing of applications depends on application technique, wood species, moisture and hazard class. An uptake of approximately 2.0 kg/m3 should be achieved by these application methods in order to ensure the protection level for the different use classes required. BQ-25 is used for preventive protection of wood and constructional timbers in areas with moderate or subtropical climate in Hazard Classes 1 to 4A according to ISO draft standard

Since after approx. 40 years of use worldwide no reports of selective acquisition of C12-16- ADBA-resistance in the field of wood protection exists, the risk of development of resistance to is considered negligible. On the other hand, C12-16-ADBAC as a wood preservative works by preventing growth of organisms, not by killing organisms that are present thus reducing the potential for resistant organisms to develop. In addition, for hard surface sanitization/disinfection (where antimicrobial activity is based on direct killing of organisms present on surfaces), investigations on exposure of domestic microbial communities to quaternary ammonium biocidal substances showed no increased antimicrobial resistance (McBain A.J. et al. 2004). Therefore, we can agree that development of resistance can be considered negligible.

Packing size 25 kg/pail, 200 kg/drum.

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