Imperial Premix was established in 1960 to supply custom vitamin mineral protein supplements to the cattle and dairy feeding industry in Southern California.  The company has grown to service the protein market by producing liquid urea and a pure form of urea called DEF.  We manufacture DEF (Diesel Exhaust Fluids) for our affiliate company DEF Products LLC.  For more information on DEF go to  The Imperial Premix facilities consist of three mills covering the Beef, Dairy and Liquid Protein markets. For a quote please call or fax us your formula, or email your formula to