Under the code name N-stoff ("substance N"), chlorine trifluoride was investigated for military applications by the Kaiser Wilhelm Institute in Nazi Germany from slightly before the start of World War II.
From 1938 construction commenced on a partly bunkered, partly subterranean 14,000 m² [REF] munitions factory at Falkenhagen, which was intended to produce 50 tonnes of N-stoff per month, plus Sarin.