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CAKING IN STORAGE OF ALKALINE CLEANING COMPOUND,
ARMY COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD
A large scale, 12 months study was made of caking in storage of a representative powdered alkaline cleaner, the standard comparison compound of Federal Specification P-C-437, Cleaning Compound, High Pressure Steam Cleaner. The study, in volving the production of 6 12 tons of the compound and its loading into 104 polyethylene lined fiber drums 125 pounds per drum, covered the parameters of order of mixing, granulation, and transportation. The parameter of anhydrous vs hydrated salts was the subject of a prelimi nary study and found not to be a factor in caking. Five granulation grades were investi gated ranging from a 10 - 20 grade 84 10 - 20 mesh to a fines grade 85 passing 100 mesh, and 40 passing 270 mesh. Three orders of mixing were used, and half the production 52 drums, consisted of various parameter changes was transported 1,000 miles by commercial car rier. Only the fines grade granulation mixes caked, in all orders of mixing and with or without transportation. Normal transportation 1,000 miles does not induce caking by vibratory packing. A granulation grade whose ingredients originally consisted of approximately equal amounts of fines and coarse particles did not cake in 12 months storage, but considerable agglomeration occurred almost all of the origi nal 46 cut passing 100 mesh was retained on that screen after the 12 months storage. Author