Tenino Copper Naphthenate (2% as metal) - 1 Gallon - Wood Preservative Ready-to-Use Copper Naphthenate (contains 2% copper as metal), meets the AWPA M4 Standard. Required by building codes (IBC 2303.1.9 & IRC R317.1.1) on end-cuts of all pressure treated lumber. Low VOC (&lt;350g/L) and 100% domestically sourced from recycled copper and reclaimed by-products. Labeled for General Use, and wood treated with Tenino maybe discarded in local landfill. Water repellant and both toxic and repellant to termites and other wood destroying insect.