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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 ...
Wood treated with this process is often used for cladding or siding, flooring, furniture and windows. For the control of pests that may be harbored in wood packaging material (i.e. crates and pallets), the ISPM 15 requires heat treatment of wood to 56 °C for 30 minutes to receive the HT stamp.
The "Bethell process"—or as it later became known, the full-cell process—involves placing wood to be treated in a sealed chamber and applying a vacuum to remove air and moisture from wood "cells". The wood is then pressure-treated to imbue it with creosote or other preservative chemicals, after which vacuum is reapplied to separate the ...
Symptoms such as sneezing, watery eyes and breathing problems are the first signs of damaging sawdust exposure. [5] Shortness of breath, decreased lung capacity and allergic reactions in the lungs (e.g., hypersensitivity pneumonitis) can also occur. [1] Breathing in wood dust can lead to asthma and lung cancer. [5]
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]
There are serious risks associated with burning pressure-treated wood. It is treated with chemicals that, although safely bound in the wood fibers for construction purposes, are inherently dangerous to woodworkers and woodburners when liberated through sanding or vaporized by heat. Similar dangers are inherent to stained, painted or sealed wood ...
Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining with the increasing recognition of the toxicity of arsenic and its compounds. [12] Arsenic has been known since ancient times to be poisonous to humans. [13]
Copper naphthenate is commonly prepared by treatment of naphthenic acid with copper (II) compounds such as basic copper carbonate or copper hydroxide. [1] Even copper (II) sulfate can be treated with sodium or potassium naphthenate in aqueous solutions. The reaction of copper metal with naphthenic acid, which has been used commercially ...