46 CFR §148.125

1. (a)Class 4.1 materials listed in Table 148.10 of this part must—
   1. (1)Be kept as cool and dry as practical before loading;
   2. (2)Not be loaded or transferred between vessels during periods of rain or snow;
   3. (3)Be stowed separated from foodstuffs; and
   4. (4)Be stowed clear of sources of heat and ignition and protected from sparks and open flame.
2. (b)Bulkheads between a hold containing a Class 4.1 material and incompatible materials must have cable and conduit penetrations sealed against the passage of gas and vapor.