Hello Flaghole;
I'm new to this forum and by no means an expert.
But, for my first career I was a hydraulic pipe fitter for over 12 years. In my opinion, the thin walled extruded acrylic tubing is not the way you want to go if you plan on pressurizing the cell.
Acrylic is already considered a hard plastic, very fragile and loves to crack on you.
If you must have a crystal clear cell, and want to go with acrylic, then I would recommend that you use CAST acrylic tube with a 1/4" wall thickness. It's more expensive, but at least it will be able to handle some pressure.
You can also find clear schedule 40 and schedule 80 PVC pipe. Polycarbonate (Lexan) is also another good alternative, but again it's expensive and difficult to glue. Weld-On makes great products for gluing all kinds of plastics and plastics to metals.
well thats my two cents,
LapperL
