[Cob] Glass impregnated wood timbers

[Amanda Peck]

Perfectly true.  That's true of all Pressure Treated wood.  But I'd be glad 
of not having to use hot dip galvanized fasteners, and general lack of 
poison.
...................
Ocean wrote:

Yep, it's water glass, Sodium Silicate.

BTW, I suspect it would be important to wear a respirator when cutting or 
sanding this product, lest one inhale microscopic glass crystals.