ACQ and Copper Azole have been in use for a decade or more.

	ACQ ACQ-treated wood was first introduced in the United States 10 years ago. It has been successfully used in Europe, Japan, New Zealand, Asia, and Australia for the last 15 years. Uses: ACQ is a fixed preservative approved for full exposure to above ground, ground contact, and freshwater applications. Chemical Specialties Osmose
	Copper Azole Wood products treated with Copper Azole have been used effectively around the world since 1992. Uses: Copper Azole is a fixed preservative approved for full exposure to above ground, ground contact, and freshwater applications. Arch Chemicals