Roger Hull wrote:

I want to build a degreasing tank using Caustic Soda (aka Sodium Hydroxide or
Lye) as the active agent. I am already aware of the necessary safety
precautions and EPA considerations. My questions a what material for the
tank and how strong a solution? Thanks.


I suggest using an old drum. If it's too tall, cut it off. Easy to make a
sheet metal lid for. Here's the deal, though. Try to get one that has no
paint and no rust on it. Sometimes drum companies strip their drums and
repaint them, and if they do, you can buy them stripped.

One pound lye per 3-5 gallons of water is a pretty strong solution.

Any lye solution will be more aggressive heated. Advantage of a metal tank
is you can put it on an outdoor propane turkey-fryer-type burner directly.

GWE