46 CFR §148.140

1. (a)Class 5.1 materials listed in Table 148.10 of this part must—
   1. (1)Be kept as cool and dry as practical before loading;
   2. (2)Be stowed away from all sources of heat or ignition; and
   3. (3)Be stowed separate from foodstuffs and all readily combustible materials.
2. (b)Special care must be taken to ensure that holds containing Class 5.1 materials are clean and, whenever practical, only noncombustible securing and protecting materials are used.
3. (c)Class 5.1 materials must be prevented from entering bilges or other cargo holds.