This invention relates to a leach-resistant borate preservative for lignocellulosic-based
products, providing resistance against insect and fungal attack for use in exterior
and ground contact applications. The preservative compositions of this invention
may be provided as a high strength liquid concentrate, suitable for transportation,
storage and easy on-site dilution, or as a ready-to-use treatment solution. These
wood preservative compositions include a borate preservative component and a co-biocidal
metal fixative such as copper or zinc. The preservative compositions also contain
volatile organic acid, free ammonia and ammonium salts to aid dissolution. Methods
for the application of these preservative compositions to wood are also provided.
