Weight is usually assumed to be the governing factor when calculating the cost of space missions, although the launch cost per ton has decreased by a factor of forty in recent years ; for long or permanent missions weight is still prohibitive and in-situ resource utilization (ISRU) preferable. A reasonable and planned step is ISRU in the case of propellant production on Mars from CO2 of the Martian atmosphere and H2 from water electrolysis of water ice from the Martian surface . However, some high-performance materials cannot be produced on site. In these cases, the shipped-in resources should be recyclable in order to cease the costly transport as efficient as possible , which makes the choice of stable and unreactive Fluoropolymers reasonable.