Insulation is the compression of explosive, with some explosives necessarily is over to explode to be able. Insulation does not have to be present however always, so that the explosive can explode violently.
So black powder in small quantities can explode only if it is dammed. That is, the black powder must be stored into a container, so that when igniting fast gases and heat can form. But it can explode from 1 to 2 kilograms violently, here serves quasi the dead weight as insulation.
The insulation in the explosive technique is used.
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