Bunker C Fuel Oil
Bunker C is a high-viscosity residual fuel oil from crude oil distillation, meeting HTS 2710.19.11.50 criteria with Saybolt viscosity >125 seconds at 37.8°C and API ≥25°. Primarily used as marine bunker fuel for large ships. Its classification reflects its role as a heavy fuel oil preparation with dominant petroleum content.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If marine bunker grade with specific sulfur limits
Certain low-sulfur bunker variants classify separately within distillate/residual fuels.
If imported as crude-derived but minimally processed
Petroleum oils closer to crude state may fall under crude oil headings.
If marketed as lubricating base stock rather than fuel
End-use as lubricant base changes classification from fuel oils.
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
• Provide sulfur content analysis to meet EPA and MARPOL regulations during customs clearance
• Use temperature-controlled storage declarations to prevent viscosity changes during transit
• Confirm no biodiesel blending, as that excludes from this subheading per chapter notes
Related Products under HTS 2710.19.11.50
No. 6 Fuel Oil
No. 6 fuel oil is a heavy residual fuel oil derived from petroleum refining, characterized by a Saybolt Universal viscosity exceeding 125 seconds at 37.8°C and an API gravity of 25 degrees or more. It falls under HTS 2710.19.11.50 as a distillate and residual fuel oil used primarily for industrial heating and power generation. This classification applies to its high viscosity and petroleum oil content over 70%.
Heavy Fuel Oil HFO 380
HFO 380 is a standardized heavy fuel oil with viscosity >125 Saybolt seconds at 37.8°C (equivalent to ~380 cSt at 50°C) and API gravity ≥25°, classified under HTS 2710.19.11.50. Used in power plants and industrial boilers requiring pre-heating. Meets criteria as petroleum-based residual fuel over 70% oil content.
Industrial Boiler Heavy Fuel Oil
This heavy fuel oil for industrial boilers has Saybolt viscosity >125 seconds at 37.8°C, API ≥25°, fitting HTS 2710.19.11.50 as a residual petroleum fuel oil. Blended from vacuum residues, it's the basic constituent (>70%) in heating preparations. Used in manufacturing for steam generation.
Power Plant Residual Fuel Oil
Residual fuel oil for power plants meets HTS 2710.19.11.50 with >125 Saybolt viscosity at 37.8°C and ≥25° API, derived from bituminous mineral processing. Contains ≥70% petroleum oils as base, excluding biodiesel per notes. Essential for large-scale electricity generation.