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This preservative is also used for remedial treatments to in-service poles including internal/external surfaces at ground or below ground level via brush/trowel, mechanical injection, or bandage wrap. Wood treated with copper naphthenate is specified for exterior above ground, ground contact, below ground and fresh water contact use applications.
Tung oil has been used for hundreds of years in China, where it was used as a preservative for wood ships. The oil penetrates the wood, and then hardens to form an impermeable hydrophobic layer up to 5 mm into the wood. As a preservative it is effective for exterior work above and below ground, but the thin layer makes it less useful in practice.
Alkaline copper quaternary, usually abbreviated ACQ, is a type of water-based wood preservative product containing a soluble copper(II) complex and quaternary ammonium alkyl- or aryl-substituted compounds ("quats"). Thus the product was originally called ammoniacal copper/quaternary ammonium. [1] [2]
Thanks to artificial preservatives, fruits, vegetables, meats and dairy products last much longer now than they naturally would, and that is not necessarily good news.
Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions. It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects. Like other copper-based wood preservatives, it ...
However, conventional wood preservatives consist of the active ingredient and a solvent, and it is the organic solvents that seem to give more cause for concern. No ill effects appear to be produced by limited exposure to hydrocarbon solvent vapour, but a higher degree of exposure may cause symptoms such as headaches and nausea, which disappear ...