HS Code for Sulfate of potash

Sulfate of potash (SOP), chemically known as potassium sulphate, is classified under HS code 3104.30. This classification is part of Chapter 31, which encompasses mineral or chemical fertilizers. Heading 3104 is dedicated specifically to potassic fertilizers. Within this heading, 3104.30 is the specific subheading for potassium sulphate. The classification is straightforward for pure or standard agricultural grades of the chemical. It is valued in agriculture for providing potassium without the high chloride content found in other potash sources, making it ideal for chloride-sensitive crops like tobacco, fruits, and vegetables. To qualify for this code, the product must be intended for use as a fertilizer or be of a grade typically used in such applications. The Chapter 31 notes are very specific: heading 3104 applies only to products used as fertilizers and not to products of Chapter 28 (chemicals) even if they could be used as fertilizers, unless they are in the forms described in the heading. Potassium sulphate is one of the few chemicals specifically named in the heading, which simplifies its classification. Importers should ensure that the purity levels and intended use are clearly stated on the commercial invoice to avoid being reclassified under Chapter 28, which might carry different regulatory requirements or duty rates. The WCO Explanatory Notes further clarify that this heading includes potassium sulphate whether or not it is pure, provided it is not put up in tablets or similar forms or in packages of a gross weight not exceeding 10 kg.

Products Included

• Agricultural grade potassium sulphate
• Water-soluble sulfate of potash for fertigation
• Granular SOP for soil application
• Standard powder sulfate of potash
• Potassium sulphate used as a fertilizer supplement

Common Misclassification

Sulfate of potash is often confused with Muriate of Potash (Potassium Chloride), which is classified under 3104.20. It may also be misclassified under 3105.20 if it is part of a multi-nutrient NPK fertilizer blend. If the potassium sulphate is of high purity for laboratory use, customs may attempt to classify it under 2833.29.

FAQ

What is the HS code for Sulfate of potash?

The HS code for sulfate of potash (potassium sulphate) is 3104.30.

Is SOP classified differently if it is liquid?

If it is a simple aqueous solution of potassium sulphate intended for fertilizer use, it remains under 3104.30, but complex liquid fertilizers fall under 3105.