An Answer that may be inexpensive than tantalum for repairing glass all over nozzles is the usage of a repair sleeve manufactured from PTFE. On this strategy, titanium putty could be used to fill the broken place. Then, a layer of cement is extra, plus the PTFE sleeve is installed https://silicon-carbide-radiant-t00875.sasugawiki.com/6484349/about_de_dietrich_glass_lined_reactors