Rocket propellant (NaNO3)

Composition

27  
Charcoal
4  
Sulfur

Description

The burning rate of this rocket fuels depends much less on pressure than that of black powder. This widens the accetable limits of the ratio nozzle area/fuel surface area.

Source: 
rec.pyrotechnics. Posted by Chris Beauregard <cpbeaure@descartes.waterloo.edu