46 CFR §148.130

1. (a)Class 4.2 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 clear of sources of heat and ignition and protected from sparks and open flame; and
   4. (4)Except for copra and seed cake, be stowed separate from foodstuffs.
2. (b)The bulkhead between a hold containing a Class 4.2 material and a hold containing a material not permitted to mix with Class 4.2 materials must have cable and conduit penetrations sealed against the passage of gas and vapor.