fuel oil grades

1 Light domestic fuel oil-distillate.
2 Medium domestic fuel oil-distillate.
3 Heavy domestic fuel oil-distillate.
4 Light industrial fuel oil. Minimum flash point of 150°F.
5 Medium industrial fuel oil.
6 Heavy industrial fuel oil.
This is about the consistency of gel toothpaste,
and is burned in the boilers of, for example, the ocean liner Queen Elizabeth.
Sometimes called “bunker C” fuel oil.

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