A broad mixture of hydrocarbons produced as distillates, as residual materials, or as blends of the two during the refining of crude petroleum. Diesel fuel usually has a distillation range of 390–715°F (200–380°C) and a specific gravity range of 0.760–0.935 (equivalent to 61.2–19.8° on the American Petroleum Institute (API) scale). In addition to these properties, diesel fuel must have <1 weight % sulfur, < 0.1 weight % ash, < 0.5 volume % water and sediment, and a high flash point (greater than 131°F or 55°C).