Fungicide and insecticide properties of boric acid are known since 30’s of the last century, but high solubility and leachability of inorganic borates limit their use for only applications not directly exposed to liquid water. A number of attempts were made to fixate borate salts into the wood structure but this research topic is still up to date and undiscovered. Water insoluble organoboron esters were tested in laboratory scale as wood preservatives. Although affected by leaching, the studied spiroborate esters were highly efficient even at very low retentions.

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