2841.90.40.00 - Aluminates

This HTS category, 2841.90.40.00, specifically covers aluminates. Aluminates are inorganic compounds formed by aluminum and oxygen, often in combination with other elements. These substances are derived from aluminic acid and its salts. Examples include sodium aluminate and calcium aluminate, which are commonly used in various industrial applications such as water treatment, cement production, and as fire retardants.

When classifying within the broader heading of "Salts of oxometallic or peroxometallic acids" (2841), it is crucial to differentiate aluminates from their sibling categories. For instance, while vanadates (2841.90.10.00) contain vanadium, ammonium perrhenate (2841.90.20.00) involves rhenium, and potassium stannate (2841.90.30.00) contains tin, aluminates are defined by the presence of aluminum in their anionic structure. Similarly, chromates of zinc or lead (2841.90.45.00) and other miscellaneous salts (2841.90.50.00) fall under different specific designations based on their metallic and anionic components.

As this is a leaf node, there are no further subcategories to introduce. The classification of aluminates is concluded at this level, focusing on their distinct chemical composition as aluminum-oxygen compounds. Practical classification relies on identifying the presence of aluminum within the anionic structure of the salt, distinguishing it from other metal salts that form part of oxometallic or peroxometallic acids.