White solid guanidine and nitric acid salt, popularized by its use in the Jetex model airplane engine monopropellants of years past. Today, it is still being used in high energy rocket propellants, air bag gas generators and pyrotechnics. Assets of use include high gas output and low flame temperatures. Its monopropellant specific impulse is 177 seconds (1.7Kn x s/Kg). Soluble in water, methanol and acetone.