3102.21.00.00 - Ammonium sulfate 🖩

This HTS category, 3102.21.00.00, specifically covers ammonium sulfate. Ammonium sulfate is a chemical compound with the formula (NH₄)₂SO₄. It is primarily used as a nitrogen fertilizer due to its high nitrogen content and its sulfur content, which is also essential for plant growth. It is commonly found in crystalline form and is a widely recognized industrial chemical for agricultural applications.

This classification distinguishes itself from its sibling category, 3102.29.00.00 ("Other"), by being a specific, defined chemical compound. While both fall under the broader heading of "Mineral or chemical fertilizers, nitrogenous: Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate," 3102.21.00.00 exclusively applies to pure ammonium sulfate. The "Other" category would encompass double salts (combinations of ammonium sulfate with other salts like magnesium or potassium) and mixtures containing ammonium sulfate and ammonium nitrate, which are not pure ammonium sulfate.

As this is a leaf node within the HTS structure, there are no further subcategories branching from this specific code. Therefore, the classification is definitive for products meeting the description of ammonium sulfate. Classification decisions at this level rely on confirming the chemical identity and intended use of the product as a nitrogenous fertilizer.