No. 5 Heavy Fuel Oil (Bunker C Grade) from Canada
No. 5 fuel oil is a heavy residual fuel oil with a Saybolt Universal viscosity at 37.8°C exceeding 125 seconds and API gravity under 25 degrees, derived from petroleum refining processes. It is classified under HTS 2710.19.06.25 due to its specific physical properties distinguishing it from lighter distillates and other fuel oils. Primarily used in large industrial boilers and marine vessels.
Duty Rate — Canada → United States
Rate breakdown
Import Tips
• Verify viscosity and API gravity via certified lab testing (ASTM D88 for Saybolt, D287 for API) to confirm classification and avoid reclassification to lighter oils
• Obtain bunker fuel delivery certificates or bills of lading specifying No. 5 grade for customs entry; include sulfur content if subject to IMO 2020 regulations
• Ensure compliance with MARPOL Annex VI for low-sulfur variants; common pitfall is mislabeling blends exceeding 70% petroleum content threshold