This is for my Hard SF world so the questions aren't limited to today's technology level, just someday. How plausible is a plastic explosive 50 times more powerful than C4? Is C4 even the strongest chemical explosive per amount? What does the speed of the burning of the explosive have to do with it's power or does it not? What kind of burn and explosion speeds are we looking at here for a plastic explosive? So I can know how fast the weapons will work and what kind of speed they'll propel their bits of casing and shrapnel at. Could such an explosive be made where it wouldn't produce any dangerous chemicals while burning that would poison life and soil on my planet? Kind of weird questions I know but thanks for the help.