The bulk density of WCS averages about 22 lb./ft.3 and requires about 80 ft.3 of storage space per ton. WCS is hydroscopic and therefore absorbs moisture from, or gives up moisture to, the surrounding air. Storage temperatures below 60ºF (15ºC) and below 10% moisture content wet basis provide the best conditions to avoid developing molds and reduce insect activity within the seed.
Whole, fuzzy cottonseed has some unique characteristics requiring special attention when using common grain-handling facilities. Unlike grain, WCS has a variable angle of repose. The angle of repose in an unrestricted pile of WCS is about 45º. However, after the seeds have settled, they will bridge – an indication that the angle of repose is greater than 90º. Extreme caution must be exercised when handling large volumes of WCS to ensure that hazardous situations do not jeopardize worker safety.
As with feedstuffs such as corn and soybeans, WCS should not be stockpiled for extended periods unless you are thoroughly familiar with proper storage conditions and aeration systems. Over many months of storage, WCS will retain its greatest value under conditions where it is covered and air is drawn through the pile to reduce and control the temperature and moisture level. If you wish to have a guaranteed supply of WCS for several months of a year, it is recommended to forward contract for future delivery. This places the responsibility of proper storage on the supplier.