No. 5 Heavy Fuel Oil (Bunker C Grade)
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If Saybolt viscosity 45 seconds or less at 37.8°C
Lighter viscosity fuel oils testing under 25° API fall under subheading for No. 4 fuel oil, based on flow characteristics for different burner systems.
If testing 25 degrees A.P.I. or greater
Fuel oils with higher API gravity are classified separately as they indicate lower density and different refining origins from heavy residuals.
If containing less than 70% by weight petroleum oils
Preparations with lower petroleum content shift to 'other preparations' subheading, excluding those where petroleum is the basic constituent.
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Import Tips & Compliance
• 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
Related Products under HTS 2710.19.06.25
No. 5 Marine Bunker Fuel Oil
Heavy fuel oil No. 5 formulated for marine propulsion, featuring high viscosity (>125 Saybolt seconds at 37.8°C) and low API gravity (<25°), obtained from bituminous mineral distillation residues. HTS 2710.19.06.25 applies specifically to this grade's properties, excluding biodiesel blends or waste oils. Supplied to oceangoing vessels for main engines.
Industrial No. 5 Residual Fuel Oil
Residual fuel oil No. 5 for stationary industrial combustion, characterized by API gravity under 25° and Saybolt viscosity over 125 seconds at 37.8°C, containing over 70% petroleum oils. This classification under 2710.19.06.25 reflects its heavy, undistilled nature from refinery processes. Ideal for power plants and large furnaces.
No. 5 High Sulfur Fuel Oil
No. 5 grade heavy fuel oil with sulfur content typically 1-3.5%, API <25°, and viscosity >125 Saybolt seconds at 37.8°C, a residual product from petroleum refining. Falls under HTS 2710.19.06.25 for heavy fuel oils meeting these specs, distinct from low-sulfur or biodiesel preparations. Used in permitted industrial burners.
Blended No. 5 Fuel Oil for Boilers
Blended residual fuel oil meeting No. 5 specifications: API gravity under 25 degrees, Saybolt Universal viscosity >125 seconds at 37.8°C, with ≥70% petroleum oils as basic constituent. HTS 2710.19.06.25 covers such blended heavy fuels excluding waste or biodiesel. Optimized for large-scale boiler systems.