2815.20.00.50 - In solid form

This HTS category, 2815.20.00.50, specifically classifies potassium hydroxide (caustic potash) when it is presented in a solid form. Potassium hydroxide is a strong inorganic base widely used in various industrial applications, including the manufacture of soaps and detergents, fertilizers, and batteries. Its solid form can include pellets, flakes, or other solidified shapes, distinguishing it from liquid or dissolved solutions.

The distinction between this subcategory and its sibling, 2815.20.00.90 ("Other"), lies in the physical state of the potassium hydroxide. While 2815.20.00.50 is strictly for solid potassium hydroxide, the "Other" category would encompass any potassium hydroxide that is not in solid form, such as aqueous solutions or other preparations. This differentiation is crucial for accurate tariff application based on the physical characteristics of the imported or exported goods.

As this is a leaf node in the HTS classification structure, there are no further subcategories. Therefore, classification under 2815.20.00.50 is determined solely by the presence of potassium hydroxide in a solid physical state, aligning with the broader scope of Chapter 28 which covers inorganic chemicals.