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But senior investigators identified the substance as RDX, a major ingredient of Semtex, a plastic explosive developed in Czechoslovakia that. Although C4, the explosive which could have been used by the mid- air attacker, is one of the most potent and dangerous explosives known,. Plastic explosive is a soft and hand- moldable solid form of explosive material.
Within the field of explosives engineering, plastic explosives are also known as putty explosives.