Polysilazanes are not vaporizable because of strong intermolecular forces.
2.
Once all the vaporizable matter is gone, there might be perfectly good ice left inside where the heat can't reach before the surface gets cold again.
3.
These systems may be used on larger small satellites, while other micro / nanosats have to use electric propulsion, compressed gas, vaporizable liquids such as butane or carbon dioxide or other innovative propulsion systems that are simple, cheap and scalable.
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