Imports In 2022, Guinea-Bissau imported $1.54k in Sodium hydroxide (caustic soda) in aqueous solution, becoming the 191st largest importer of Sodium hydroxide (caustic soda) in aqueous solution in the world. At the same year, Sodium hydroxide (caustic soda) in aqueous solution was the 1473rd most imported product in Guinea-Bissau. Guinea-Bissau imports Sodium hydroxide (caustic soda) in aqueous solution primarily from: Portugal ($1.54k).