The 2x4, 2x6, 2x8, 2x10, etc lumber that is treated is NOT generally treated for in-ground use. It has only 1/2 the amount of chemical needed for burial as posts, etc.
To get flat dimension lumber treated for in-ground use, you would normally have to special order or get directly from the treating company.
The square pieces: 4x4, 6x6, 8x8 are normally treated to double that amount of chemical. Check the end tags for the pounds per cubic foot that it is treated to.
The old CCA treated material is banned for residential use, and now is ACQ or some other chemical.
CCA can still be used for industrial or farm applications, but you will have to special order, possibly from the company that does the chemical application. (The ban on CCA material is a whole 'nother rant.)
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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