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Machinbird, you may want to explore ‘Explosafe’, a popular product several decades ago. A quick search indicates that they are still around, or at least the patents are. Basically an aluminum, open cell filler for fuel tanks that removed the possibility of fuel vapour igniting. NATO tests involved external tanks being hit with explosive 20mm rounds and no ignition. In the 1980s they stopped selling the material to other manufacturers but it appears that may have changed.
Regards,
John
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Vintage Aviation Team
Hangar 005, CNC3, Caledon Ontario
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