Subheading 281511: Sodium Hydroxide (Caustic Soda); Solid
Subheading 281512: Sodium Hydroxide (Caustic Soda); in Aqueous Solution (Soda Ly … etc.
Subheading 281520: Potassium Hydroxide (Caustic Potash)
Subheading 281530: Peroxides of Sodium or Potassium