[alwa]

Is formaldehyde used in treating PT lumber? That link suggests it shows up in resins for engineered wood products, like particleboard for interior furniture.

I was of the impression that PT lumber to modern standards involved relatively innocuous copper plus an organic biocide like an azole (for antifungal purposes), no?

And I thought the formaldehyde-heavy resins were regulated into obscurity back in like 2009, were they not?