"Cursitor Doom" wrote in message
...
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?


There are two methods of treatment dipping and pressure treatment.
Fence panels etc are usually dipped as the timber is thin.
The pressure treated goes in an autoclave, vaccuum is drawn and the
trreatment sprayed on.
Peneration depends on howmuch of a vacuum is pulled.
I watched one that seemed pretty dodgy to me.

The green is just dye to show it has been treated.
Peneration seems very variable to me.
You are supposed to treat cut ends.

At one time the treatment was with copper and arsenic salts.
Chromium now I think. Not as good as the previous stuff.