2710.19.11.15 - Containing not more than 500 ppm of sulfur

This HTS classification covers specific types of distillate and residual fuel oils that meet stringent sulfur content limitations. Products classified under 2710.19.11.15 are characterized by containing no more than 500 parts per million (ppm) of sulfur by weight. This low sulfur content is a key determinant for its usage, often mandated for environmental reasons in certain applications, such as in emissions-controlled zones or for specific industrial boilers. The oils in this category also exhibit a Saybolt Universal viscosity at 37.8°C between 45 and 125 seconds, corresponding to what is commonly known as No. 4-type fuel oils, and must test 25 degrees API or more.

The critical differentiator for this category is its sulfur limit. Its sibling category, 2710.19.11.25, encompasses fuel oils that *exceed* 500 ppm of sulfur. Therefore, the presence of a sulfur analysis report or equivalent documentation confirming the sulfur concentration below the specified threshold is essential for correct classification. Both categories fall under the broader umbrella of distillate and residual fuel oils, testing 25 degrees API or more and having a viscosity between 45 and 125 seconds at 37.8°C, but the sulfur content dictates their segregation.

As this is a leaf node in the HTS classification structure, there are no further subcategories. Classification at this level is definitive based on the outlined physical and chemical properties: its origin as a distillate or residual fuel oil, its API gravity, its Saybolt Universal viscosity, and critically, its low sulfur content not exceeding 500 ppm. Importers and customs brokers must ensure that all these criteria are met to accurately classify goods under this specific tariff line.