Density Considerations
Thermodynamic Properties
Diffusivity/Viscosity Considerations
Transport Properties
Biological Properties
Solvating Strength
General Process Concepts
Modified Supercritical Fluids

Carbon dioxide - that is by far the most common SCF – exhibits biocide properties and is very active on fungi, bacteria and viruses. It has only a very low toxicity on humans, although asphyxia happens when it accumulates in non-ventilated areas, especially in lower parts of buildings (cellars, …). N2O has different biological properties and it is commonly used for anesthesia (Note : Its use exposes to other hazards as it must be considered as a comburant that may lead to explosion when contacted with flammable solutes). Light hydrocarbons are not toxic (but present a very important explosion hazards). HFC are neither toxic nor flammable, but can decompose in highly toxic gases when submitted to a flame.

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