Photoflash Compositions Desensitized by Coatants
ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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A process for blending photoflash powder was investigated in which the powder was coated with material for the purpose of decreasing the hazard. Various coatant candidates were applied by both coacervation and contact methods, and the resulting formulations characterized with respect to physico- chemical, sensitivity, stability, and performance properties. The method finally selected was contact coating from a wet medium employing an electrically conducting carbon black as coatant. During the program there was a scale-up from laboratory bench quantities to a 5 kg batch. For the larger batches a counter current mix muller was employed. The method is safer than the non-proprietary standard methods previously used, since the material is wet or damp throughout the blending process. Furthermore, the coating, by its ability to leak off voltage, reduces the electrostatic hazards during the blending and further processing of the powder. The product obtained is stable and equals the performance of the uncoated formulations.
- Coatings, Colorants and Finishes
- Fabrication Metallurgy