The Development of a Boron and Iron Oxide Delay System

A new pyrotechnic composition consisting of boron and iron oxide has been developed for use in delays. The consolidated composition exhibits even burning characteristics, it is readily ignited from a percussion primer and has a good flame/particle output at the end of the delay interval. Boron has a low toxicity and iron oxide is regarded as being less hazardous to health than many materials traditionally used in pyrotechnic delays. It was demonstrated that a highly reproducible 0.20 + or - 0.02 second delay igniter can be prepared using this composition. An assessment of some parameters which may affect delay time and reproducibility is included. Useful data for the development of similar delay systems is provided.