antelopedundee
Well-known member
If I had to take a swing at it I would imagine that it has to do with the global potassium nitrate supply chain. My assumption is that there are relatively few sources of potassium nitrate worldwide (industrial scale sources), there are probably less in the US than in Europe/Asia and those in the US are probably ear marked for the military.
Europe/Canada have militaries a fraction the size of ours per capita so they probably don't restrict the commercial use of domestically produced potassium nitrate. The other components are fairly common, so I would imagine you build your factory near the source of the most limited ingredient.
I'm sure the real answer is vastly more complicated, but it probably goes something like that...
They use nitric acid to produce nitrocellulose I think. Why would they use potassium nitrate? With KNO3 you'd have to use some other acid which doesn't make sense and introduces a contaminant.