Accession Number : ADA331765

Title :   Effect of a Warm, Moist Environment on JA2 Gun Propellant.

Descriptive Note : Final rept. Jul 96-Mar 97,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Pesce-Rodriguez, R. ; Leffers, R. ; Sagear, P.

PDF Url : ADA331765

Report Date : OCT 1997

Pagination or Media Count : 36

Abstract : Grains and sticks of JA2 propellant downloaded from a 1 2O-mm tank round that had been subjected to conditioning at high temperature and humidity were observed to be discolored and covered with an unknown liquid. Analysis of the propellant indicated a decrease in the nominal diethylene glycol dinitrate (DEGDN) plasticizer content. The nitroglycerine (NG) content was not observed to deviate significantly from its nominal level. The cause of the discoloration of the propellant was traced to its high moisture content. The liquid covering the material was determined to be a mixture of water and DEGDN. in follow-up experiments, it was determined that JA2 propellant can absorb an excess of 13 wt-% moisture. It was also learned that graphite glaze can reduce the tendency of a grain to absorb moisture for grains immersed in water. When conditioned in a high-humidity environment, graphite glaze appeared to have no effect on the level of moisture absorbance. It is suspected that graphite serves to plug pores on the surface of the propellant and thereby inhibit, but not prevent, moisture absorption.

Descriptors :   *MOISTURE, *GUN PROPELLANTS, HIGH RATE, WATER, GRAPHITE, ABSORPTION, HUMIDITY, SOLID PROPELLANTS, NITRATES, PLASTICIZERS, GLYCOLS, DISCOLORATION, NITROGLYCERIN, DIOXANES, GLAZES.

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE