AT-400 heat transfer fuid is a gas/liquid phase hig temperature synthetic heat transfer fluid with outstanding thermal stability, which is operated in temperature range of 12~400deg.C. AT-400 heat transfer fluid has the highest operating temperature among the synthetic heat transfer fluid due to its incomparable and irreplaceable high temperature performances which is widely used in the CSP industry etc. AT-400 heat transfer fluid is the same product as Dowtherm A & Therminol VP-1, which can be mixed together in any ratio. AT-400 heat transfer fluid's main characters are low content of chloride and sulphur, which can greatly reduce the corrosion to the equipment.