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Adequacy of H3 LOSP tin-based preservative treatment for exposed external structural uses

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This project reviewed the published scientific data available on the performance of LOSP formulations based on tin. It aimed to identify and describe further experimental work required to support the continued use of H3 LOSP in load-bearing applications.

Some findings are: Timber treatments with tributyl tin oxide (TBTO) or tributyl tin naphthenate (TBTN) appear to give useful service life to window joinery and other ‘non structural’ commodities; TBTN appears to be less stable than TBTO in service; and painting TBT-treated timber prolongs service life.

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L. J. Cookson and M. E. Hedley (ensis)

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