The effect of compaction on the storage stability of DDT water-dispersible powders.

Tests have been carried out to determine whether DDT powder might be subjected to greater compaction than is now the rule without affecting the quality of the product, particularly as regards its storage stability. Such increased compaction would make it possible to pack the powder in smaller containers for any given quantity and thus to achieve considerable savings in shipping and handling costs.The tests described in this paper showed that, while suspensibility of the powder is little affected by pressures of up to 45 p.s.i., considerable deterioration of suspensibility occurs when compacted samples are heated to 50 degrees C-temperature encountered in conditions of tropical storage.The authors conclude that DDT powders currently produced would be seriously damaged if stored for long periods at high temperatures while under pressure. For this reason they recommend that bags should not be used for shipment of DDT water-dispersible powders in the place of the polyethylene-lined fibre drums at present in general use.