Without getting into too much detail on what I am building, here is what I am basically asking, Will Soidum Hydroxide (NaOH) corrode brass? I am thinking yes. Bras is made up of zinc (which I know NaOH will corrode) and copper (I am not sure about copper). Basically, I have a value, made mostly from brass, that I want to use to control the flow of something which will be in VERY Close proximity to a concentrated solution of NaOH. The valve probably has some steel in it too I am guessing. So what metals are out, obviously Aluminum, Zinc, ...? Are any metals "in"? I would probably be better going with a PVC valve, right? But I dont think they are as high a quality as the metal ones, plus I want[ed] to connect the value to a brass hose barb adapter to connect to a plastic tube. I guess I could go PVC all the way. Any thoughts?