2710.19.06.15 - Containing more than 500 ppm of sulfur

This HTS classification, 2710.19.06.15, specifically identifies distillate and residual fuel oils that exhibit a sulfur content exceeding 500 parts per million (ppm) by weight. These oils are further characterized by their viscosity: they have a Saybolt Universal viscosity at 37.8°C ranging from 45 seconds to 125 seconds, aligning with the specifications for No. 4-type fuel oils. The API gravity for these products is also tested at under 25 degrees.

The primary distinction of this category from its sibling, 2710.19.06.05, lies solely in the sulfur content. While both categories describe No. 4-type fuel oils tested under specific API gravity and viscosity parameters, this particular classification covers those oils with a higher concentration of sulfur (over 500 ppm). This difference in sulfur content is a critical factor for customs purposes, often impacting environmental regulations and applicable duties.

As this classification represents a leaf node within the HTS, there are no further subcategories to introduce. Therefore, the focus remains on the precise combination of physical properties – API gravity, Saybolt viscosity, and crucially, sulfur content – that define these specific fuel oils. Users of this classification should ensure their product meets all specified technical parameters to ensure accurate import or export declaration.