Imports In 2021, Christmas Island imported $1.01k in Sodium hydroxide (caustic soda) in aqueous solution, becoming the 0th 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 0th most imported product in Christmas Island. Christmas Island imports Sodium hydroxide (caustic soda) in aqueous solution primarily from: N/A.