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Specifically, according to GlobalSecurity.org, What is PETN is a manmade chemical mixture. It is "one of the strongest known high explosives with a relative effectiveness factor (R.E. factor) of 1.66. It is more sensitive to shock or friction than TNT or tetryl, and it is never used alone as a booster. It is (Petn) primarily used in booster petn and bursting charges of small caliber ammunition, in upper charges of detonators in some land mines and shells, and as the explosive core of primacord. During World War II the M9A1 2.36" Rocket Launcher (Bazooka) charge, with 8 oz of pentolite, could penetrate up to 5 inches of what is petn armor."