2833.25.00.00 - Of copper

This HTS category, 2833.25.00.00, specifically encompasses sulfates of copper. These are inorganic chemical compounds where copper is combined with the sulfate radical (SO₄²⁻). This includes various forms of copper sulfate, such as copper(II) sulfate pentahydrate (often seen as blue crystals), which is widely used in agriculture as a fungicide and algaecide, in electroplating, and as a laboratory reagent.

This classification is distinguished from its siblings by the specific metal cation present. For instance, 2833.21 covers sulfates of magnesium, 2833.22 those of aluminum, and 2833.24 those of nickel. Each of these sibling categories pertains to compounds with distinct chemical properties and industrial applications solely based on the specific metal they contain.

As a leaf node, 2833.25.00.00 does not have further subdivisions. Therefore, the classification hinges on the definitive presence of copper as the principal metal within the sulfate compound. When classifying, key considerations include identifying the chemical composition and confirming that the substance is indeed a sulfate where copper is the primary metallic element, differentiating it from other metallic sulfates or copper compounds classified elsewhere in the Harmonized Tariff Schedule.