Boron preservatives are used primarily in Australian house frames to protect the timber against wood-boring insects, such as the Lyctid beetles. They are also particularly effective against the powder post beetle that attacks some starch rich hardwoods, and the furniture beetle that can occur mainly in softwoods. Specific formulations of boron are also used south of the Tropic of Capricorn to protect softwood framing against termites
Boron-based preservatives are usually applied by dipping unseasoned timber into treatment solutions, by spraying or brushing the treatment chemical onto the wood, or by vacuum pressure impregnation of seasoned softwood timber. They should not be used where the treated timber comes into ground contact as the boron may leach out again.
cost effective and easy to apply
diffuses deeply into unseasoned (green) timber
prevents most forms of insect attack