Timber treatment
From Freepedia
Timber treatment and lumber preservation in forestry describes the intensive treatment of timber with chemical agents to increase its durability and ability to be used in an otherwise inappropriate situation like inground use.
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Hazards
Unfortunately, many of the timber treatments have proven to be extremely hazardous both to the workers and the environment; as a result many treatment centres have been forced to close and undertake massive environmental restoration and remediation. With many of the chemicals having a long period through which they are highly dangerous, the legacy of the chemical cocktails can probably never be totally eliminated.
Non-toxic treatment
The use of sodium silicate as a timber treatment for pressure-treated wood began in 2005, after an environmental chemist's research on allergies and autism branched into her developing a method for rendering sodium silicate insoluable once the lumber has been treated with it. This treatment preserves wood from moisture and insects and possesses some flame-retardant properties. Sodum silicate treated lumber is considered a safer alternative to chromated copper arsenate (CCA, restricted by the EPA in 2004) and alkaline copper quaternary (ACQ, which corrodes non-galvanized nails and screws).
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