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N2O

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The combination of HTPB or PMMA solid fuel and N2O is totally benign and non-toxic. It is difficult to find a rocket motor safer than one using rubber/plastic and laughing gas. It is non-explosive. The rubber / LOX combination has been rated by the Vandenberg range as a 0 lb of TNT equivalent (i.e. non-explosive), and N2O is even safer (it is used as a pressurant for whipped cream). The fuel has to be vaporized in the presence of an atomized oxidizer with a high temperature igniter in order for it to burn. Even in failure mode, it's safe. Flow oxidizer without vaporized fuel and nothing happens. Vaporize fuel without oxidizer and nothing happens. Ignition only occurs when fuel is vaporized in the presence of an atomized oxidizer with a high temperature igniter. Principal uses are as an anesthetic in short-duration surgical operations (prolonged inhalation can cause death) and as a propellant for food aerosols. It is most commonly produced by decomposition of ammonium nitrate.