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%.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If viscosity ≤125 seconds at 37.8°C
Lower viscosity heavy fuel oils classify under the preceding subheading for similar API gravity but less viscous profiles.
If testing <25 degrees A.P.I.
Lower API gravity residual fuels fall under separate subheadings based on density thresholds.
If containing <70% petroleum oils
Preparations with lesser petroleum content shift to other petroleum oil preparations heading.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify Saybolt viscosity certification from supplier to confirm >125 seconds at 37.8°C for proper classification
• Obtain flash point documentation as heavy fuel oils often require IMO compliance for marine transport
• Avoid misclassification as lighter distillates by ensuring API gravity testing ≥25 degrees
Related Products under HTS 2710.19.11.50
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.
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.