Vaseline (petrolatum) is a semi-solid hydrocarbon mixture obtained by deep refining of petroleum fractions. Its main components are **C₂₅~C₅₀** saturated hydrocarbons (such as paraffin, microcrystalline wax, etc.). Due to its excellent **sealing properties, lubricity, moisturizing properties** and chemical inertness, it is widely used in medicine, cosmetics, industry and other fields.