Abstract: The invention relates to a device for imparting a non-explosive and a non-propulsive property to a rocket motor casing made from a composite material during a slow cook-off test, which consists of using a predetermined pyrotechnic pellet having an ignition temperature of at least 140.degree. C. but below the violent ignition temperature of the propellant material under slow cook conditions, whereby the composite material of said casing is significantly weakened in the predetermined temperature, causing a casing failure and a non-propulsive burning of the rocket motor. The predetermined pyrotechnic pellet is located on the inner surface and will ignite the propellant grain at a lower rate.

Abstract: A device for imparting non-explosive and non-propulsive properties to a warhead during a slow cook-off test, which comprises a pyrotechnic pellet located inside a tube having a predetermined ignition temperature of at least 130.degree. C. but below the violent ignition temperature of the material under slow cook-off conditions, whereby the venting holes present in the aft closure of said tube, are covered by a composite material that loses its strength below the predetermined temperature, causing a pressure relief and a non-propulsive burning of said warhead.