- Nov 2, 2011
I did a quick search here and more broadly across the internet, and couldn't find a list of manufacturers that are known to use water glass (sodium silicate) to coat their bowls. From my limited understanding, among bowl coatings, most are harmless, but water glass forms an impermeable barrier that would prevent water absorption and whatnot in the bowl, thus potentially negatively affecting the smoking characteristics of a pipe. In other words, a characteristic it would be preferable to avoid in a pipe. Anyone know of pipe makers confirmed to use a water glass coating?