Bah, I thing that all the people is thinking too much about the static electricity...
I remember, it was almost forty five or fifty years ago, in my land the M.L.A.I.C in the new rules was saying about that: only the glass tubes were good for the use of shooting powder and the end of this story is in fact that in this time the only important producer of them was Pedersoli (did you have seen the close contact between MLAIC and Pedersoli ?), the price of those tubes was prohibitive and we have looked for plastic tubes.
In Europa the MLAIC is omnipotent and is the only one that makes rules in competition, challenges and internal rules of the clubs concerning the BP, so the glass tubes became an obligation for years.
So, now all the new shooters think first about the risk of exploding before they shoot for the first time and everybody and is brother ask about glass tubes.
In fact we explain that all our tubes are in plastic (or polypropylene) coming from China and very low cost and after several tests never one tube had exploded: all is in plastic, tubes in plastic, powder dosing machines LEE and almost that we are using...
The only precaution is to clean one or two times those tubes with something like Teepol or other produce for dishes washing.
I don't care 'bout all that and all my tubes (and those for my friends too) are mosly coming from Ali Express (like Amazon quality but lower cost) or from some laboratories dowtown.
In now more of sixty years of shooting rifles, pistols and revolvers I never ear somebody that have seen powder exploded and for the primer powder too however we use OB and Swiss N°1 for priming...
Go in peace brothers, the Lord has done things well...................................... at least over this point...
I did a real work to write this in English (It's easier in French
) and I hope that somebody will be able to understand me.
Have nice day.
Erwan.