High Sulfur Fuel Oil (HSFO)

High Sulfur Fuel Oil (HSFO) Definition


High Sulfur Fuel Oil (HSFO) is the bottom of the oil barrel with the lowest priced oil product now that is the alternative to using marine fuels with such low sulphur content. The HSFO have a maximum sulphur content of 3.5%.

HSFO is the alternative to using marine fuels with such low sulfur content in ECAs is the use of scrubbers. This technology involves injecting water into the exhaust stream to reduce sulfur and other emissions. However, refitting a ship with this technology costs several million euros and means that the ship is docked for a period of time, which leads to a loss in revenue and income for the shipowners. On the other hand, a scrubber allows higher-sulfur marine fuels to be used. In this context, such heavy fuel oils are designated as high-sulfur fuel oils (HSFO), which have a maximum sulfur content of 3.5% as permitted under ISO 8217. Huei Jie Oil is a big producer of HSFO in Iran.

HSFO 180 refer to aromatic rubber process oil with sulfur content around 3%.

HSFO Applications

  1. Heating up homes and fuel trucks.
  2. Lighting up furnaces.
  3. Producing steam for industrial uses and for generating electric energy.
  4. Used to power different types of engines, lamps, heaters, stoves and lanterns.
  5. Emergency generators


Characteristics Test Methods Limit RME180
Density at 15oC, kg/m3 ISO 3675 or 12185 991
Kinematic viscosity at 50oC, mm2/s ISO 3104 180
Flash Point, oC ISO 2719 60
Pour Point (upper) (2)oC ISO 3016
Winter quality 30
Summer quality 30
Carbon residue, % (m/m) ISO 10370 15
Ash, % (m/m) ISO 6245 0.10
Water, % (V IV) ISO 3733 0.50
Sulphur, % (m/m) ISO 8754 3.5
Vanadium mg/kg IP 501/IP 470/ISO 14579 200
Aluminum IP 501/IP 470/ISO 14578 80
plus silicon, mg/kg
Total sediment, potential, % (m/m) ISO 10307-2 0.10