Schlenk flasks and tubes are specialised borosilicate 3.3 glassware designed for handling air- and moisture-sensitive compounds. Their airtight construction prevents air ingress, while their chemical-resistant glass allows for safe general heating and ultra-low temperature operations. Widely used in research, industrial and teaching laboratories, Schlenk flasks and tubes support inert-atmosphere reactions, vacuum manipulations and precise chemical experiments with reliable performance under extreme conditions.