2918.13.30.00 - Potassium sodium tartrate (Rochelle salts)

This classification encompasses potassium sodium tartrate, commonly known as Rochelle salts. These are double salts of potassium and sodium tartrate, distinct for their crystalline form and specific chemical properties, which render them useful in various industrial and laboratory applications. Rochelle salts are characterized by their ability to form crystals and their use as a mild laxative, in electroplating, and as a component in certain analytical reagents.

This specific HTS code differentiates Rochelle salts from other tartaric acid salts. Potassium antimony tartrate (2918.13.10.00), or tartar emetic, is identified by its antimony content and its historical use as an emetic and mordant, differing significantly in its chemical composition and primary applications. Similarly, potassium bitartrate (2918.13.20.00), or cream of tartar, is a single acid salt of tartaric acid, primarily used in baking and as a food additive, and is chemically distinct from the double salt. The "Other" category (2918.13.50.00) is reserved for tartaric acid salts not specifically enumerated elsewhere.

As potassium sodium tartrate (Rochelle salts) represents a specific chemical compound with defined applications, this node is a terminal classification within the tariff schedule. Therefore, there are no further subcategories branching from this HTS code. Classification at this level is determined by the precise chemical identity and recognized trade name of the product.