Synthetic Lubricating Oils
These have been developed to meet the most of severe operating conditions, such like those existing in aircraft engines in which oil might have to be pumped at - 50oC, but while aircraft is landing or taking off, the similar oil might get heated to as high a temperature as 250oC. Under both these conditions, the oil ought to maintain satisfactory properties and High operating pressures and high temperatures require oils of superior resistance to oxidation along with a high viscosity, but at the mean time they must possess sufficiently low freezing point. Additionally, the lubricant must be non-inflammable. It is possible now to synthesise oil with a molecular structure that yields optimum performance under particular operating conditions.
Chemical synthetic oils possess distinctive features such like high viscosity index, high flash point, thermal stability and inflammability.
The high cost of these compounds limits their present utilize only to certain specialised military and industrial uses.