Storage of Borates in Bulk
Although most borates can be stored in silos, some borates, such as Dehybor, can cake if storage is prolonged, due to the hygroscopic nature of the material. Silo storage of powdered Borax Decahydrate, powdered Neobor and powdered Optibor is not recommended.
Either concrete or mild steel (not recommended for Optibor due to potential corrosion problem) silos may be used. For silos of less than 500 tons capacity, steel construction is possibly the cheaper option. If concrete is preferred it may still be more economical to make the conical section in steel.
Handling of Bagged Products
All bagged borate products should be handled with care. Avoid puncturing any bags while using sharp instruments. A hole in a bag not only results in spillage but may allow moist air to enter which can cause caking. The potential for contaminating the products through punctured bags is also greater.
Borate products are packed in 50 lb. or 25 kg multi-wall kraft paper bags with polyethylene liners. Borates are also available in 2,500 lb. or 1,000 IBC’s (Intermediate Bulk Carriers) constructed from white woven 100% polypropylene with or without polyethylene liners.
Storage Life and Expiration of Borates
Borates are chemically stable indefinitely if stored in the original, intact packaging in a dry and covered warehouse. The concept of an expiration date is not applicable.
All borates have a natural tendency to cake under prolonged storage, which is exacerbated under compaction or in extreme heat or humidity, or cycling heat/humidity. We therefore recommend storage on racking or single height and the application of FIFO (First In First Out) principles of stock control.
Powders are more sensitive to the changes outlined and will often show a fairly early tendency to form loose agglomerates. Generally speaking, these agglomerates disintegrate under hand pressure and this compaction should not be mistaken for hard caking.
Our NF (National Formulary) and EP (European Pharmacopoeia) products are the only products that have a three year from production expiration date, which is noted on the COA. This is technically a retest date.