Caustic Soda 99% Sodium Hydroxide 99% Soda Flakes High quality sodium flakes available at shanghaiyiyu. Best price and logistics services also available. Get in touch with us Product name: Caustic soda flakes Other name: natrium hydroxydatu, caustic alikali Shape: white translucent solid Physical and chemical properties: pure product is colorless transparentcrystal, the relative density of 2.130. Melting point 318.4 DEG C. Boiling point 1390. Packing: 25kg packaging bag