The type of kerosene most often encountered, K1, is used as heating oil and doesn't begin to freeze until minus 40 degrees Fahrenheit. Kerosene is a compound made up of long chains or rings of hydrocarbons, and it is valued for its molecular stability through a wide temperature range.
Kerosene is the most pure and stable fuel made from petroleum. In addition to a low freezing point, kerosene also has relatively high flash and auto-ignition points, making it far safer to store and work with than more volatile fuels such as gasoline. For these reasons, kerosene is used in everything from heating oil to rocket fuel.