LM-16 is modified from synthetic hydrocarbons, with stable structure and good thermal stability. The appearance is colorless or light colored liquid, insoluble in water, with a closed flash point above 120 ℃, and high safety. It has the characteristics of uniform heating, accurate temperature control, good heat transfer effect, energy saving, convenient transportation and operation, and can be applied in fields such as medicine, chemical industry, photothermal new energy, oil and natural gas, etc.