2710.19.06 - Testing under 25 degrees A.P.I.

This HTS category, 2710.19.06, specifically classifies petroleum oils and oils obtained from bituminous minerals that are not crude, and are not elsewhere specified or included, provided they contain at least 70 percent of such oils as their basic constituent. The key distinguishing characteristic for this subdivision is that the product exhibits a density testing *under* 25 degrees A.P.I. (American Petroleum Institute). This measurement of API gravity indicates a lighter product than what falls into its sibling category.

In contrast, HTS code 2710.19.11 covers similar petroleum products but where the density tests at 25 degrees A.P.I. or *more*. This difference in API gravity is a critical factor for customs classification, often reflecting variations in the refining process, composition, and intended end-use of the product.

Within this classification, further subdivisions exist to refine the categorization based on physical properties. These subcategories consider the Saybolt Universal viscosity at 37.8°C. Specifically, products with a viscosity of 45 seconds or more but not exceeding 125 seconds are classified as No. 4-type fuel oils. Products exceeding 125 seconds viscosity are classified as heavy fuel oils. Additionally, an "Other" subcategory, 2710.19.06.50, exists for products not meeting the specific viscosity criteria but still fitting the broader description of testing under 25 degrees A.P.I.