Pellets are manufactured from grains or seeds themselves, or from residues produced in the milling process. Like oilcakes, after production they should be left for some time to cool prior to shipment. If pellets are loaded at a high temperature or with an excessive moisture content, or are adversely influenced by climatic changes during the voyage, the cargo can overheat and/or sweat. In certain circumstances moreover, pellets can emit carbon dioxide gas, with resulting danger to anyone entering cargo holds. Certainly shipsengaged to carry expellers, oilseed cake or pellets, should be fitted with a fire smothering system, eg: a CO2 system, so as to control possible outbreaks of spontaneous combustion.