Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Most commercial etchers are made from Polypropylene (which can
withstand higher temperatures than PVC) and they're usually welded
together. There's at least one brand I've seen whose tank is molded
out of a single sheet of Polypropylene - so the tank won't leak. Most
have see-thru Lexan (or a similar plastic) top covers.