I am looking for borosilicate glass tubes which can be used to contain a vacuum, so the top is sealed and then there is a vacuum pump at the bottom where the edges are also sealed, effectively making a vacuum in a glass tube.
The only thing to mention is that the walls need to be somewhat thicker than normal to protect against implosion due to the fact that there will be a vacuum inside, so I need an idea of how thick the glass needs to be bearing in mind that the inner diameter is 20 cm.
The pressure outside the cylinder is atmospheric and the pressure inside is very low and can be taken to be 0. Is there a formula or computation which would give me a good approximation for how thick the tube needs to be? I also appreciate that there could be some shear stress due to the tube needing to be so thick.