Section 148.135 - Stowage and segregation for materials of Class 4.3(a) Class 4.3 materials listed in Table 148.10 of this part which, in contact with water, emit flammable gases, must-(1) Be kept as cool and dry as practical before loading;(2) Not be loaded or transferred between vessels during periods of rain or snow;(3) Be stowed separate from foodstuffs and all Class 8 liquids; and(4) Be stowed in a mechanically ventilated hold. Exhaust gases must not penetrate into accommodation, work or control spaces. Unmanned barges that have adequate natural ventilation need not have mechanical ventilation.(b) The bulkhead between a hold containing a Class 4.3 material and incompatible materials must have cable and conduit penetrations sealed against the passage of gas and vapor.