Blended No. 4 Marine Bunker Fuel
A No. 4-type fuel oil blended for marine bunker use, meeting the 45-125 SUS viscosity at 37.8°C and under 25° API per HTS 2710.20.0510 criteria. Contains permitted biodiesel and bituminous mineral oils for ship propulsion in intermediate ports.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for heavy marine fuels testing 25° API or higher
API gravity threshold determines distillate vs residual classification in marine fuels.
If crude-derived without refinement
Unrefined petroleum oils remain in crude heading rather than processed distillates.
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 MARPOL Annex VI sulfur content certification; exceeding limits triggers environmental penalties
• Declare exact biodiesel percentage as it affects base oil constituent calculation for 70% threshold
• Use ISO 8217 test methods for viscosity verification to prevent disputes during customs inspection
Related Products under HTS 2710.20.05.10
No. 4 Fuel Oil (Standard Grade)
A medium-viscosity distillate fuel oil with a Saybolt Universal viscosity at 37.8°C between 45 and 125 seconds, classified under HTS 2710.20.0510 due to its API gravity under 25 degrees and specific viscosity range defining No. 4-type fuel oils. Primarily used for industrial heating and marine applications where higher viscosity provides stable combustion.
Industrial No. 4 Heating Oil
Heavy distillate fuel oil for industrial boilers with Saybolt viscosity 45-125 seconds at 37.8°C and API <25°, precisely matching HTS 2710.20.0510 for No. 4-type oils. May include biodiesel blends not classified as waste.
Power Plant No. 4 Residual Fuel
Residual-type No. 4 fuel oil for power generation, with precise 45-125 SUS viscosity at 37.8°C and sub-25° API gravity under HTS 2710.20.0510. Blended from bituminous minerals for high-energy stationary engines.
No. 4-Type Bituminous Fuel Oil
Fuel oil derived from bituminous minerals meeting No. 4 specifications: 45-125 SUS at 37.8°C, API under 25°, classified HTS 2710.20.0510. Used in asphalt plants and heavy machinery.
Biodiesel-Blended No. 4 Fuel Oil
No. 4-type fuel oil containing biodiesel (mono-alkyl esters) with 70%+ petroleum oils, viscosity 45-125 SUS at 37.8°C, API <25° per HTS 2710.20.0510. Designed for compliant low-emission industrial burners.