Bunker C Fuel Oil
Bunker C is a heavy residual fuel oil classified as Fuel Oil No. 6 under HTS 2710.19.06.30 due to its API gravity under 25 degrees and Saybolt Universal viscosity exceeding 125 seconds at 37.8°C. It is primarily used as marine bunker fuel for large oceangoing vessels.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If viscosity between 45-125 seconds at 37.8°C
Lower viscosity heavy fuel oils fall into a different subheading within the same fuel oil category.
If API gravity 25 degrees or higher
Fuel Oil No. 6 classification requires testing under 25° API; higher gravity shifts to adjacent subheading.
If imported as crude petroleum oil
Unrefined petroleum oils are classified in Chapter 27 heading 2709 rather than refined products in 2710.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify sulfur content compliance with MARPOL Annex VI and U.S
• EPA regulations; obtain bunker delivery note and lab analysis for viscosity/API confirmation; ensure proper Bill of Lading notation as residual fuel oil
Related Products under HTS 2710.19.06.30
No. 6 Residual Fuel Oil
Standard No. 6 fuel oil is a high-viscosity residual product from crude oil distillation, meeting HTS 2710.19.06.30 specs with Saybolt viscosity >125 seconds and low API gravity. Used in industrial boilers and power generation.
Heavy Fuel Oil 380 cSt
IFO 380 (Intermediate Fuel Oil with 380 centistokes viscosity at 50°C) qualifies as Fuel Oil No. 6 under HTS 2710.19.06.30 when meeting the Saybolt viscosity >125 sec at 37.8°C and sub-25° API criteria. Common in international shipping bunkers.
Industrial Boiler Fuel Oil No. 6
Heavy residual fuel oil No. 6 formulated for large industrial boilers, classified under HTS 2710.19.06.30 for its high viscosity (>125 SUS at 37.8°C) and density (API <25°). Provides high BTU content for manufacturing processes.
Power Plant Residual Fuel Oil
No. 6 fuel oil specification for utility-scale power generation, meeting HTS 2710.19.06.30 with required low API gravity and high Saybolt viscosity. Economical baseload fuel for coal-alternative combustion.