Jet Research Center, Inc.

Robert S Riggs

A method for preparing 2,6-bis(picrylamino)-3,5-dinitropyridine (PYX) which includes the steps of first dissolving crystalline PYX in a primary solvent in which the solvent used is selected from the group consisting of pyridine, dimethylformamide, methylsulfoxide or mixtures thereof. The primary solvent system is then combined with a second solvent in which the PYX is substantially insoluble, but which, in admixture with the primary solvent, forms a true solution of the PYX, referred to as the secondary solution. A third solvent is then added to the binary solvent system, which third solvent is soluble with the binary solvent system but which promotes precipitation of PYX in a form which exhibits improved characteristics as an explosive.

Method of preparation of 2,6-bis(picrylamino)-3,5-dinitropyridine

The compound 1,3,5-trinitro-2,4,6-tripicrylbenzene useful as an explosive.

1,3,5-trinitro-2,4,6-tripicrylbenzene

An improved shaped charge comprised of a bell-shaped casing, a shaped explosive material disposed within the casing having a cavity formed therein and a liner disposed within the cavity formed of compressed powdered metal is provided. The compressed powdered metal liner includes a coating of an unsaturated organic compound or mixture of such organic compounds thereon whereby the liner is protected from corrosion attack without adversely affecting the performance of the shaped charge. A method of preventing the corrosion of the compressed powdered metal liner of a shaped charge is also provided.

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Grand Prairie, TX, United States of America

Robert S Riggs