The good thing about C4 is as component it is very safe. I was talking to some of our demolitions people when I was the NCO Acadamy and they said that in order for it to explode you have to have 2 things, heat and pressure. If you set it on fire it will not explode. If you throw it against a wall it will not explode. You combine the 2 together you get one hell of an explosion. They said that when they go to the field they cut small blocks of C4 and use it to cook on by just setting it on fire.