2710.19.06.30 - Fuel oil No. 6

This HTS category, 2710.19.06.30, specifically covers Fuel Oil No. 6. It is a heavy residual fuel oil characterized by its high viscosity and density. As a derivative of crude petroleum, it is used primarily as fuel in industrial furnaces, boilers, and large marine engines due to its substantial energy content and cost-effectiveness compared to lighter oils.

Fuel Oil No. 6 is distinguished from its sibling category, Fuel Oil No. 5 (2710.19.06.25), by its even higher viscosity. While both are considered heavy fuel oils, Fuel Oil No. 6 generally exhibits a Saybolt Universal viscosity at 37.8°C exceeding 125 seconds, indicating a thicker consistency and requiring specialized heating and pumping equipment for effective use. The "Other" category at this level would encompass residual fuel oils that do not meet the specific criteria for Fuel Oil No. 5 or No. 6.

As this is a leaf node in the HTS classification, there are no further subcategories under 2710.19.06.30. Classification within this specific code is determined by meeting the defined characteristics of Fuel Oil No. 6, including its API gravity testing results (under 25 degrees API) and its Saybolt Universal viscosity at 37.8°C being greater than 125 seconds. This detailed specification ensures accurate identification and consistent tariff application for this particular grade of fuel oil.