Therminol® VP-3 is a liquid/gas-phase thermal oil that has been specially developed to operate in the gas phase at lower temperatures than is practically possible with traditional diphenyl oxide/biphenyl-based thermal oils such as Therminol® VP-1.Therminol® VP-3 has a normal boiling point of 243°C, which is 14°C lower than the normal boiling point of Therminol® VP-1.