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What is chromated copper arsenate?

arsenate chromated Copper
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What is chromated copper arsenate?

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Chromated copper arsenate (CCA) is a chemical preservative that protects wood from rotting due to insects and microbial agents. CCA contains arsenic, chromium and copper. CCA has been used to pressure treat lumber used for decks, playground equipment (playsets) and other outdoor uses since the 1940s. Since the 1970s, the majority of the wood used in residential settings is CCA-treated wood.

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