Detailed Product Description 1. Caustic soda, also known as: sodium hydroxide (caustic soda flake, solid base, liquid caustic soda), caustic soda; Huo Jian; caustic soda. 2. Caustic soda Molecular formula: NaOH. Commercially available are solid caustic soda flake caustic soda and liquid caustic soda two kinds: pure white solid caustic soda, caustic soda flakes loaded with blocks, rod-like caustic ...