why does it have to be all glass? you could wrap a glass 4L cider jug in strands of fiberglass fabric and epoxy. though you wouldnt have to wrap it solid, just do a netting pattern around the outside. (thick bands of glassed fiber would retain enough strangth) that way you could still watch the reaction go on inside. now, it would be really cool if you could use that for all sorts of high positive pressure reactions if you could rig a high-pressure equalized addition funnel in the same method. perhaps high pressure would be sufficient to perform the p-benzo oxidation over PdCl2 without causing any thermal polymerisation. it might need some heat to get it started...
the pressure could be monitored using a loaded piston. piston position could be calibrated to the different weights of springs that you were using depending on scale/reaction ect... you could also pressure-rate all your components (though im sure you could buy all sorts of pressure guages) it could provide your system with some elasticity, and a valve could be blown automatically at a set pressure.
what if you put your setup at the bottom of a swimming pool? (external cooling, the shock wave would get you if it blew in the pool and you were in it) no, thats a dumb idea. although, all your measurements could be read poolside on long hoses (with safety valves) and if it did go to shit, then hey, break into a different pool next time cuz it would be poisonous as hell! yeah, thats a dumb idea.
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