GSFC's Diammonium Phosphate [(NH4), HPO. (18 % N, 46% P2O5)] plant has a capacity of 1,08,000 TPA. Main raw material for DAP are Sulphur & Rock Phosphate. The main feedstock is Naptha & Associated Gas.

GSFC has also a coastal DAP Plant at Sikka in Jamnagar district with a rated capacity of 3,26,000 TPA. The main raw materials are imported Ammonia and Phosphoric Acid. At Sikka, the capacity had been expanded by 3.96 LT in the recent past.