Molten salt is salt which is solid at standard temperature and pressure (STP) but enters the liquid phase due to elevated temperature. A salt that is normally liquid even at STP is usually called a room temperature ionic liquid, although technically molten salts are a class of ionic liquids.

Item	index
Melting point	142℃-148℃
Boiling point	680℃
Diatexis heat	18Kcal/Kg
Specific heat	0.34 Kal/Kg℃
Thermal expansivity	4×10-4/℃
Average thermal conductivity	0.317
Operating temperature	150℃-550℃
Appearance	White crystal

Matters need attention:

1.Molten salt should be kept clean, do not allow to mix with organic such as charcoal, rosin, reducing substances etc, to avoid arousing fierce chemical reaction.
2.At the beginning of heating, controlling heat-up speed strictly, to avoid system temperature unstable.
3.Keep flowrate of heat cycling steady, forbid temperature higher than Coating temperature.
4.Forbid water and organic matter intermingle when being used in high teperature.
5.When temperature exceed 550℃,Molten salt become unstable, it begin to react and release gas, molten salt’s melting point promote, and make moten salt degenerate.
6.When appear quite a lot sediment in heat medium molten salt, should renewal the old molten salt.
7.Before stop working, all molten salt must be sent back to store molten salt trough,then engine can be cut off.