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Why use ammonium perchlorate instead of ammonium nitrate for solid fuels?

Ammonium perchlorate: 2 NH4ClO4 -> Cl2 + 4 H2O + N2 + 2 O2
Ammonium nitrate: 2 NH4NO3 -> 4 H2O + 2 N2 + O2

The stuff is used as an oxidizer, so the oxygen is needed, but it is only useful as a support mass in the water, not as a reaction mass.

For the same amount of oxygen from ammonium nitrate, you need 36% more mass than with ammonium perchlorate.

Ammonium perchlorate is also much denser at 1.95 g / cm³ compared to ammonium nitrate at 1.73 g / cm³.

If you were to use ammonium nitrate, you would not only have to use 36% more for the same amount of fuel, but the space requirement of the oxidizer would increase by about 53%.

In the reaction, more mass would be converted in the drive, but with a lower Isp, thanks to the larger mass of accompanying substances. This can become a small benefit for ammonium nitrate even under certain circumstances.

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